JP6933586B2 - Power system stabilization processing device and power system stabilization system - Google Patents

Description

Embodiments of the present invention relate to a power system stabilization processing device and a power system stabilization system.

When an accident occurs in the power system, the system may remove the accident, that is, automatically control a circuit breaker or the like to eliminate the accident. At this time, the accident removal time may be delayed or a wide range of interruptions may occur due to the malfunction of the circuit breaker, or the system configuration after the accident removal may be significantly changed due to a serious accident such as a route disconnection accident. In such a case, sudden changes in tidal currents and a large imbalance between supply and demand may be caused. Therefore, by preventing the occurrence of these events and preventing the spread to the entire system, the power system An accident spill prevention relay system that stabilizes the power is known.

Among the accident spill prevention relay systems, the online pre-calculation type system uses online data indicating the current system status to repeatedly calculate the stability of an assumed accident and control it according to the expected accident type. The power generator and the like are set in advance, and when an accident actually occurs, the preset devices to be controlled are collated, and control is performed based on the collation result.

The conventional online pre-calculation type system stabilization system creates correspondence information between the accident type and equipment such as generators to be controlled, but since it is necessary to reflect a lot of system information, it is necessary to switch the operation of the power system. When the connection status is changed due to such reasons, it takes a certain amount of time to create or update the corresponding information. Therefore, until the update of the response information is completed, the actual power system connection status and the power system connection status at the time of creating the response information do not match, and if an accident occurs in the power system in a situation where they do not match, the actual accident type will be changed. Inappropriate control may be performed because it is not included in the accident type prepared in the response information.

IEEJ Technical Report No. 801 "System step-out / accident ripple prevention relay technology", Institute of Electrical Engineers of Japan, October 2000, p5-6, p52-57, p61, p74-75 "Next-generation digital relay D4 that reduces the burden on operators", Toshiba Review Vol. 63, No. February 2008

An object to be solved by the present invention is to provide a power system stabilization processing device and a power system stabilization system capable of performing suitable stabilization control for a system accident of the power system.

The power system stabilization processing device of the embodiment has a central calculation unit and a central control unit. The central arithmetic unit collects system information including the connection state and power flow state of the power system, and each of a plurality of assumed accident types in which the presence or absence of an accident is defined for each system element constituting the power system, and the system. A transient stability calculation is performed based on the information, and a control table in which suitable control target device information is selected for each assumed accident type is generated. The central control unit acquires connection information of controllable devices and accident information of the power system, refers to the accident information, and when it is determined that a system accident has occurred, a plurality of in the control table. It is determined whether or not the system element related to the assumed accident type and the system element indicated by the acquired connection information match, and if it is determined that they match, the control table corresponds to the acquired accident information. When it is determined that the control signal is output to the control target device information corresponding to the assumed accident type to be performed and it is determined that they do not match, the assumed accident type having a predetermined relationship with the acquired accident information is supported in the control table. It is determined that the control signal is output to the control target device information.

The block diagram of the power system stabilization system 1 of 1st Embodiment. The figure which shows an example of the control table created by the central arithmetic unit 100. The figure which shows an example of the reading process of the control table by the central control unit 200. The figure which shows another example of the control table created by the central arithmetic unit 100. The figure which shows another example of the reading process of the control table by the central control unit 200. The flowchart which shows an example of the flow of processing executed in the power system stabilization system 1 of 1st Embodiment. The graph which shows the relation example between the control table of the central calculation unit 100 and the central control unit 200, and the system state of the power system E. The block diagram of the power system stabilization system 2 of the 2nd Embodiment. FIG. 5 is a flowchart showing an example of a processing flow executed in the power system stabilization system 2 of the second embodiment. The block diagram of the power system stabilization system 3 of the 3rd Embodiment. The figure which shows an example of the control table created by the central arithmetic unit 100. The figure which shows an example of the reading process of the control table by the central control unit 200B. FIG. 5 is a flowchart showing an example of a processing flow executed in the power system stabilization system 3 of the third embodiment. The block diagram of the power system stabilization system 4 of 4th Embodiment. The block diagram of the power system stabilization system 5 of 5th Embodiment. The conceptual diagram which shows the implementation example of the power system stabilization system S.

Hereinafter, the power system stabilization processing device and the power system stabilization system of the embodiment will be described with reference to the drawings.

(First Embodiment)

FIG. 1 is a configuration diagram of a power system stabilization system 1 including the power system stabilization processing device 10 of the first embodiment. The power system stabilization system 1 is an online pre-calculation type system stabilization system. The power system stabilization system 1 includes, for example, a central calculation unit 100, a central control unit 200, a control unit 300, and an accident detection unit 400. Further, the power system stabilization processing device 10 includes, for example, a central calculation unit 100, a central control unit 200, and a control unit 300. However, the power system stabilization processing device 10 does not necessarily have to include the control unit 300. These components are realized, for example, by executing a program (software) by a hardware processor such as a CPU (Central Processing Unit). In addition, some or all of these components are hardware (circuits) such as LSI (Large Scale Integration), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), GPU (Graphics Processing Unit), etc. It may be realized by the part; including circuitry), or it may be realized by the cooperation of software and hardware. The program may be stored in advance in a storage device such as an HDD (Hard Disk Drive) or a flash memory, or is stored in a removable storage medium such as a DVD or a CD-ROM, and the storage medium is stored in the drive device. It may be installed in the storage device by being attached. In the example of FIG. 1, the central calculation unit 100 and the central control unit 200 may be integrally configured. The power system stabilization processing device 10 may be a device that constitutes a part of the digital relay. A digital relay instantly (for example, several tens of milliseconds) causes a system accident such as a lightning strike that occurs in a power system facility such as a power transmission line after converting analog input signals such as voltage and current of the power system into digital data. It is a higher-performance protection relay device that detects and disconnects the accident section to minimize the power failure time.

The central calculation unit 100 includes, for example, a system information collection unit 110, a system model creation unit 120, an analysis condition setting unit 130, and a stability determination unit 140.

The system information collection unit 110 collects system information (online data for power supply) input from the power system E via the power supply information network N. The system information is, for example, information on the connection state of the power system E, the power supply / demand state, and the tidal current state. The power system E outputs system information at a fixed cycle or a system information update cycle. The system information collection unit 110 outputs the collected system information to the system model creation unit 120. The system model creation unit 120 is for analysis that represents the current system information based on, for example, the system information input from the system information collection unit 110, the data of the control target device information and the system data information recorded in advance. Create a phylogenetic model. The control target device information is, for example, information on a device controlled by the power system stabilization system 1 and information on a state (for example, a connection state or a cutoff state) of each of the controlled devices with respect to the power system E. The device to be controlled is, for example, a circuit breaker or a disconnector. The system data information is, for example, the impedance of a transmission line. Further, the system model creation unit 120 outputs the created analysis system model to the analysis condition setting unit 130.

The analysis condition setting unit 130 sets the analysis condition based on the analysis system model input from the system model creation unit 120 and the data of the assumed accident type. Hereinafter, each of the data of the assumed accident type will be referred to as "assumed accident type". The analysis condition is, for example, a condition including a combination of a plurality of devices that control the power supply in the power system E for the assumed accident type. Further, the analysis condition setting unit 130 outputs the set analysis condition to the stability determination unit 140. The stability determination unit 140 performs a transient stability calculation based on the analysis conditions input from the analysis condition setting unit 130. The transient stability calculation is, for example, a simulation calculation for improving the stability of the power system E by repeatedly performing the stability calculation for a possible system accident. The stability determination unit 140 determines the stability of the power system E for each analysis condition, and is necessary for maintaining the stability of the power system E for each assumed accident type when an accident related to the assumed accident type occurs. Select the device information to be controlled. Hereinafter, the list of control target device information selected for each assumed accident type is referred to as a "control table". The series of processes of the central calculation unit 100 described above is performed at a predetermined cycle. The predetermined cycle is, for example, a system information update cycle. Further, the predetermined period may be set according to the scale of the system handled by the power system stabilization system 1, the number of types of assumed accidents, and the processing capacity of the central calculation unit 100.

The central control unit 200 includes, for example, a control table storage unit 210, a system connection state determination unit 220, a system connection state reading unit 230, and a control content selection unit 240. The central calculation unit 100 stores the control table in the control table storage unit 210 of the central control unit 200. The control table storage unit 210 is realized by a non-volatile storage device such as EEPROM (Electrically Erasable and Programmable Read Only Memory) or HDD (Hard Disk Drive) and a volatile storage device such as RAM (Random Access Memory) or register. Will be done. The control table storage unit 210 may be, for example, an external storage device located outside the power system stabilization processing device 10. The control table storage unit 210 stores, for example, the above-mentioned control table and other information.

The system connection state determination unit 220 has a configuration of system elements stored in the control table storage unit 210 at the time of creating a control table and a configuration of system elements input from an accident detection unit 400 described later when a system accident occurs. Determine if they match. The system element is, for example, a line constituting the power system E and a phase constituting an alternating current transmission line provided for each line. The control table shows the assumed accident type according to the state of each system element, for example. When the system connection state determination unit 220 determines that the configurations of the system elements match, the system connection state determination unit 220 outputs a record of the corresponding control table to the control content selection unit 240. When the system connection state determination unit 220 determines that the configurations of the system elements do not match, the system connection state reading unit 230 outputs the control table and the configuration and status of the system elements input from the accident detection unit 400. ..

The system connection state reading unit 230 selects one assumed accident type from the control table by reading the configuration of the system element input from the system connection state determination unit 220 based on a predetermined reading rule. The predetermined replacement rule is, for example, a rule for selecting the assumed accident type most similar to the configuration of the system element input from the system connection state determination unit 220 from the control table, or the strictest rule from the control table. It is a rule to select the assumed accident type assuming a system accident. The system connection status reading unit 230 outputs one record of the control table to the control content selection unit 240.

The control content selection unit 240 selects the control target device information based on the record of the control table input from the system connection state determination unit 220 or the system connection state reading unit 230, and outputs the control target device information to the control unit 300. The control unit 300 outputs control information to the control target device.

The accident detection unit 400 performs accident notification processing. The accident notification process is, for example, a process of notifying the system connection status determination unit 220 that a system accident of the power system E has occurred and at the same time outputting the latest control target device information of the power system E and the configuration of system elements. Is.

Hereinafter, the reading process of the control table by the system connection state reading unit 230 will be described in more detail with reference to FIGS. 2 and 3. FIG. 2 is a diagram showing an example of a control table stored in the control table storage unit 210. In the example of FIG. 2, each of the lines 1L and 2L is a unit line included in the power system E. It is assumed that each of the lines 1L and 2L is provided with R-phase, S-phase, and T-phase, which are three-phase AC power transmission elements. The configuration of the grid element is represented by the lines and phases described above. Further, as shown in FIG. 2, the control table shows the assumed accident type (the state in which the three-phase AC current transmission lines of the lines 1L and 2L, which are system elements, are in the healthy phase or the accident phase, respectively) and the devices C1 to. This is data representing the association with the device to be controlled in C4. In FIG. 2, the record in the control table is referred to as a "case". For example, in Case 1-3, "The R phase of the line 1L is the accident phase, the S phase and the T phase of the line 1L are the healthy phases, and the R phase and the T phase of the line 2L are the healthy phases. Yes, when the S phase of the line 2L is in the accident phase state, it means that the controlled device is C3.

In the example of FIG. 2, in each case, the state of each phase of the two lines (1L, 2L) is associated with the controlled device information corresponding to the state of each of the R phase, S phase, and T phase of the two lines. (Case 1-1 to Case 1-32). Further, in FIG. 2, in Cases 1-33 to 1-36, the control target device information is not set. This is because when the control table shown in FIG. 2 is created by the stability determination unit 140, the configuration of the system element in which both the lines 1L and 2L are in the connected state and the line 2L is in the hibernation state is not considered. Can occur if

FIG. 3 is a diagram for explaining an example of the reading process of the control table by the system connection state reading unit 230. The upper figure of FIG. 3 is an excerpt of case 1-33 from the control table of FIG. In the upper figure of FIG. 3, case 1-33 states that "the R phase of the line 1L is the accident phase, the S phase and the T phase of the line 1L are the sound phases, and the line 2L is in a dormant state. In the state, the R phase, the S phase and the T phase are not used. Further, the upper figure of FIG. 3 shows that the control target device information setting corresponding to the assumed accident type of Case 1-33 does not exist.

Further, the lower figure of FIG. 3 is a diagram showing a state in which Case 1-33 is replaced with Case 1-8 having a predetermined relationship as a result of the replacement process. The predetermined relationship is, for example, a relationship in which the configurations of the system elements partially match and do not completely match. In the lower figure of FIG. 3, case 1-8 states that "the R phase of the line 1L is the accident phase, the S phase and the T phase of the line 1L are the sound phases, and the R phase and the S phase of the line 2L. And the T phase is in the accident phase. Further, the lower figure of FIG. 3 shows that the controlled target devices corresponding to the assumed accident type of Case 1-8 are C3 and C4.

For example, it is assumed that the accident detection unit 400 detects a system accident having the same system element configuration as the case 1-33 shown in the upper figure of FIG. In this case, the system connection state determination unit 220 compares the configuration of the system element of the system accident detected by the accident detection unit 400 with the assumed accident type of the control table stored in the control table storage unit 210, and responds. Attempts to acquire information on the device to be controlled in Case 1-33. However, in Case 1-33, there is no setting related to the controlled device information. Therefore, the system connection state determination unit 220 outputs the assumed accident type of case 1-33 and the control table to the system connection state reading unit 230.

The system connection state reading unit 230 selects a suitable reading target for case 1-33 from the control table shown in FIG. For example, the grid connection state reading unit 230 replaces the unused phase of the line 2L of the case 1-33 with the one in which the R phase, the S phase, and the T phase of the line 2L are all accident phases, and controls the case 1-8. Select the target device information. In the examples given in FIGS. 2 and 3, as a predetermined replacement rule for selecting a suitable replacement target, the unused phase is replaced with the accident phase, and the replacement process for selecting the case of the more severe assumed accident type is performed. An example is shown, but other reading rules may be used.

Hereinafter, with reference to FIGS. 4 and 5, other specific examples of reading the control table by the system connection state reading unit 230 will be shown. FIG. 4 is a diagram showing another example of the control table stored in the control table storage unit 210. FIG. 4 shows control of the devices C1 to C4 when each of the three-phase alternating current transmission lines of the lines 1L and 2L is in the healthy phase or the accident phase, as in the example of the control table shown in FIG. The correspondence with the target device information is organized in a table format. As shown in FIG. 4, in each case, the state of each phase of the two lines (1L, 2L) is associated with the corresponding controlled device information (Case 2-33 to Case 2-36). In Cases 2-1 to 2-32, there is no setting of device information to be controlled. This is because when the control table shown in FIG. 4 is created by the stability determination unit 140, the line 1L is in the connected state and the line 2L is in the hibernation state, and both the lines 1L and 2L are in the connected state. It can occur if certain assumed accident types are not considered.

FIG. 5 is a diagram for explaining another example of the control table reading process by the system connection state reading unit 230. The upper figure of FIG. 5 is an excerpt of case 2-2 from the control table of FIG. In the upper figure of FIG. 5, in case 2-2, "the R phase of the line 1L is the accident phase, the S phase and the T phase of the line 1L are the sound phases, and the R phase and S of the line 2L are assumed accident types. Indicates that the phase is a healthy phase and the T phase of the line 2L is the "accident phase". Further, the upper figure of FIG. 5 shows that the control target device information setting corresponding to the assumed accident type of Case 2-2 does not exist.

Further, the lower figure of FIG. 5 is a diagram showing a state in which Case 2-2 is replaced with Case 2-34 as a result of the replacement process. In the lower figure of FIG. 5, Case 2-34 states that "the assumed accident type is that the R phase and T phase of the line 1L are the accident phase, the S phase of the line 1L is the healthy phase, and the line 2L is in a dormant state. Therefore, the R phase, the S phase, and the T phase are not used. Further, the lower figure of FIG. 5 shows that the controlled target devices corresponding to the assumed accident type in Case 2-34 are C2, C3 and C4.

For example, it is assumed that the accident detection unit 400 detects a system accident having the same system element configuration as in case 2-2 shown in the upper figure of FIG. In this case, the system connection state determination unit 220 compares the configuration of the system element detected by the accident detection unit 400 with the assumed accident type of the control table stored in the control table storage unit 210, and corresponds to Case 2-. Attempts to acquire information on the device to be controlled in 2. However, in Case 2-2, there is no setting related to the controlled device information. Therefore, the system connection state determination unit 220 outputs the assumed accident type of case 2-2 and the control table to the system connection state reading unit 230.

The system connection state reading unit 230 selects a suitable reading target for Case 2-2 from the control table shown in FIG. For example, in the system connection state reading unit 230, since two of the six phases of the lines 1L and 2L of Case 2-2 are the accident phases, similarly, two of the six phases are the accident phases. Select either 2-34 or Case 2-35 as a candidate for replacement. Further, for example, it is preferable that the system connection state reading unit 230 replaces the accident phase of the T phase of the line 2L in case 2-2 with the accident phase of the T phase of the line 1L based on a preset reading rule. Is determined, and the combination of the assumed accident type in Case 2-34 and the controlled device information is selected. In the examples given in FIGS. 4 and 5, a replacement example in which a case is selected based on the total number of accident phases is shown as a predetermined replacement rule for selecting a suitable replacement target, but other replacement rules may be used. You may use it.

With such a configuration, the power system stabilization system 1 is a system in which a system accident occurs immediately after a system switch in which the configuration of the system element changes, and the system of the system accident output from the accident detection unit 400. Even if the system element configuration related to the assumed accident type that matches the element configuration does not exist in the control table, the system connection status reading unit 230 selects suitable controlled device information based on the preset reading rules. Therefore, appropriate control can be performed.

FIG. 6 is a diagram showing an example of a processing flow when a system accident occurs, which involves a control table replacement process, by the power system stabilization system 1.

First, the accident detection unit 400 collects system information of the power system E (step S100). Next, the accident detection unit 400 determines whether or not a system accident has occurred from the collection result of the system information (step S102). When the accident detection unit 400 determines that a system accident has occurred, the accident detection unit 400 outputs the control target device information and the configuration of the system element to the system connection state determination unit 220. When the accident detection unit 400 determines that no system accident has occurred, the accident detection unit 400 waits until the accident occurrence of the power system E is detected again. Next, the system connection state determination unit 220 calls the control table from the control table storage unit 210 (step S104). Next, the system connection state determination unit 220 includes the configuration of the system element at the time of creating the control table stored in the control table storage unit 210 and the configuration of the system element at the time of the occurrence of the system accident input from the accident detection unit 400. Is determined (step S106). When the system connection state determination unit 220 determines that the configurations of the system elements match, the system connection state determination unit 220 outputs a record of the control table corresponding to the control content selection unit 240. When the system connection state determination unit 220 determines that the configurations of the system elements do not match, the system connection state determination unit 220 outputs the configuration of the system element of the corresponding system accident to the system connection state reading unit 230. Next, the system connection state reading unit 230 performs a reading process based on the configuration of the system element of the system accident output by the system connection state determination unit 220, and outputs a record of the control table corresponding to the control content selection unit 240. (Step S108). Next, the control content selection unit 240 selects the control target device information based on the record of the corresponding control table (step S110). Next, the control unit 300 outputs control information to the controlled device (step S112). This ends a series of processes.

FIG. 7 is a diagram for explaining the relationship between the state of the power system and the state of each control table of the central processing unit and the central control unit.

FIG. 7 (1) shows the timing at which the system state of the power system changes. FIG. 7 (2) shows the timing at which the state of the control table of the central processing unit changes. FIG. 7 (3) shows the timing at which the state of the control table of the central control device changes. FIG. 7 (4) shows the timing for switching whether or not the control table of the central control device is valid under the conditions shown in FIGS. 7 (1) to 7 (3).
Note that the example of FIG. 7 shows a conventional central processing unit and central control unit that do not have the functions of the central processing unit 100 and the central control unit 200 in the first embodiment described above. Therefore, there is a time zone in which the system state indicated by the control table does not match the change in the state of the power system. Hereinafter, the timing at which the power system stabilization system 1 of the first embodiment becomes effective will be described with reference to FIG. 7.

In the example of FIG. 7, it is assumed that the power system includes, for example, two lines for connecting a plurality of devices, as in the example of the control table shown in FIGS. 2 to 5. For example, FIG. 7 (1) shows that one of the two lines (1L, 2L) is inactive and the other is in the connected state between the time t0 and the time t1. Further, in FIG. 7 (1), the power system shows that two lines are connected after the time t1.

FIG. 7 (2) shows the timing at which the central processing unit updates the control table based on the connection information of the power system. For example, at time t3, the central processing unit starts creating a control table based on the system information of the power system E from time t0 to time t3. For example, at the time t3, the central processing unit determines the stability when the power system is in the state 2 (2 lines), and starts creating the control table corresponding to the state 2. The central processing unit completes the creation of the control table corresponding to the state 2 at the time t4.

FIG. 7 (3) shows the timing at which the central control unit receives the control table from the central processing unit. For example, the central controller receives the control table when the time reaches t0 and t5.

In FIG. 7 (4), for example, during the time from time t0 to t1 and the time after time t5, the control table of the central control device reflects the state of the power system, and appropriate control is performed based on the control table. It shows that it is in a state where it can be performed. On the other hand, during the time t1 to t5, the system information is different from that of the control table, indicating that the control table does not reflect the state of the power system. In such a change of state, for example, when the occurrence of an accident is detected at the timing when the time t2 is reached, there is a possibility that appropriate control cannot be performed based on the control table.

On the other hand, according to the power system stabilization system 1 of the first embodiment, even if the timing is different from the control table and the system information as shown in the time t2 of FIG. 7, the control is performed as necessary. By performing the table replacement process, alternative control information can be selected and appropriate control can be performed.

According to the power system stabilization system 1 of the first embodiment described above, alternative control information is selected even when a system accident of a system element in which the control target device information is not set in the control table occurs. And appropriate control can be performed.

(Second Embodiment)
Next, the power system stabilization system 2 of the second embodiment will be described. In the following description, parts having the same functions as those described in the first embodiment shall be given the same names and reference numerals, and specific description of the functions will be omitted. The same applies to other embodiments described later.

FIG. 8 is a configuration diagram of the power system stabilization system 2 of the second embodiment. The power system stabilization processing device 10A of the power system stabilization system 2 has a switching detection unit 250 and a control table update unit 260 in the central control unit 200A as compared with the power system stabilization processing device 10 of the first embodiment. And further prepare. Therefore, in the following, the switching detection unit 250 and the control table update unit 260 will be mainly described.

In the second embodiment, the accident detection unit 400 performs the switching detection process and outputs the processing result to the switching detection unit 250. The switching detection process notifies the switching detection unit 250 that the configuration of the system element of the power system E and the state of the control target device information have been changed, and notifies the latest power system E control target device information and system. It is a process to output the composition of the element. The switching detection unit 250 performs the system connection state determination process based on the notification that the state has been changed, which is input from the accident detection unit 400. The system connection status determination process is, for example, whether or not the combination of the system element configuration at the time of creating the control table and the control target device information is different from the combination of the system element configuration after switching and the control target device information. Is a process for determining. When the switching detection unit 250 determines that the combination of the system element configuration and the control target device information is different, the system connection state reading unit 230 is contacted with the system element configuration and the control target device in order to read the control table in advance. The combination with the information and the control table are output. The switching detection unit 250 determines whether or not the combination of the system element configuration and the control target device information is the same, and if it is determined that they are the same, the accident detection unit 400 notifies the system accident and further states. Wait for notification that has changed.

The system connection status reading unit 230 performs the control table reading process based on the combination of the predetermined update rule, the configuration of the system element after switching, and the controlled device information, and updates the control table result of the reading process. Output to unit 260. The control table update unit 260 updates the control table by reflecting the result of the reading process input from the system connection state reading unit 230.

In this way, in the power system stabilization system 2, a system accident occurs in a state where the control table update unit 260 is changed in the system element configuration and the control target device information at the timing when the switching detection process is performed. , And read the control table in advance. As a result, in the power system stabilization system 2, it is better to change the control target when the configuration of the system element of the system accident output from the accident detection unit 400 does not exist in the control table before the replacement process or by switching the system. Also in this case, suitable control information can be selected based on the control table after the replacement process, and appropriate control can be performed on the power system E.

FIG. 9 is a diagram showing an example of a processing flow when a system accident occurs, which involves a control table replacement process, by the power system stabilization system 2.

First, the accident detection unit 400 performs the switching detection process and notifies the switching detection unit 250 (step S200). Next, the switching detection unit 250 calls the control table from the control table storage unit 210, and determines whether or not the configuration of the system element and the control target device information are different (step S202). Next, when the switching detection unit 250 determines that the configuration of the system element and the control target device information are different as a result of the system connection state determination process, the system element configuration and the control target device when the control target device information is switched. The information and the control table are output to the system connection status reading unit 230. When the switching detection unit 250 determines that the configuration of the system element and the control target device information match, it waits until it detects the occurrence of an accident in the power system E. Next, the system connection state reading unit 230 performs the reading processing of the control table, and outputs the result of the reading processing to the control table updating unit 260. (Step S204). Next, the control table updating unit 260 updates the control table and reflects the result of the reading processing of the system connection state reading unit 230 (step S206). Next, the accident detection unit 400 collects system information of the power system E (step S208). The accident detection unit 400 determines whether or not a system accident has occurred from the collection result of the system information (step S210). When the accident detection unit 400 determines that a system accident has occurred, the accident detection unit 400 outputs the control target device information and the configuration of the system element to the system connection state determination unit 220. When the accident detection unit 400 determines that no system accident has occurred, the accident detection unit 400 waits until a new notification is input from the accident detection unit 400. Next, the control content selection unit 240 selects the control target device information based on the configuration of the system element at the time of the accident (step S212). Next, the control unit 300 outputs control information with respect to the control target device information (step S214). This ends a series of processes.

Here, the timing at which the power system stabilization system 2 of the second embodiment becomes effective will be described with reference to FIG. 7 described above. According to the power system stabilization system 2, the control table replacement process is started at the time t1 when the system switching is detected. Therefore, the time (time t1 to t5) when the control table and the system information are different can be shortened.

As described above, according to the second embodiment, in addition to achieving the same effect as that of the first embodiment, the system connection state reading unit 230 requires complicated reading, and the reading process may take a certain period of time. However, by detecting the system switching in advance and performing the control table replacement process in advance by the control table update unit 260, it is possible to perform appropriate control more quickly when a system accident occurs after the system switching occurs. can.

(Third Embodiment)
Next, the power system stabilization system 3 of the third embodiment will be described.

FIG. 10 is a configuration diagram of the power system stabilization system 3 of the third embodiment. The power system stabilization system 3 replaces the system connection state reading unit 230 provided in the central control unit 200A of the second embodiment with the central control unit 200B of the power system stabilization processing device 10B, and supplementary control information selection unit 270. To be equipped. Therefore, in the following, the supplementary control information selection unit 270 will be mainly described.

In the third embodiment, the control table storage unit 210 outputs the latest control table to the supplementary control information selection unit 270 at the timing when the latest control table is input from the stability determination unit 140 to the control table storage unit 210. do. Supplement The control information selection unit 270 extracts the assumed accident type in which the control target device information setting does not exist in the control table from all the assumed accident types that the power system E can take. Supplement The control information selection unit 270 selects from the control table the control target device information of a suitable assumed accident type, which is the replacement target of the extracted assumed accident type, based on a predetermined condition. Supplement The control information selection unit 270 outputs the assumed accident type extracted to the control table update unit 260 and the selected control target device information to be replaced. The control table update unit 260 adds / updates the combination of the assumed accident type and the control target device information input from the supplementary control information selection unit 270 to the control table, outputs the combination to the control table storage unit 210, and stores the combination.

Hereinafter, with reference to FIGS. 11 and 12, specific examples of the extraction process and the replacement process of the assumed accident type by the supplementary control information selection unit 270 will be shown. FIG. 11 is a diagram showing an example of a control table stored in the control table storage unit 210 according to the third embodiment. FIG. 11 shows devices C1 to C4 when the three-phase alternating current transmission lines of the lines 1L and 2L are in the healthy phase or the accident phase, as in the example of the control table shown in FIGS. 2 and 4. Of these, the correspondence with the devices to be controlled is organized in a table format.

As shown in FIG. 11, Cases 3-1 to Case 3-32 hold the control target device information settings, but Cases 3-33 to 3-40 do not have the control target device information settings. This is because the control table shown in FIG. 11 is created by the stability determination unit 140, as in the case of the example of the control table of the first embodiment shown in FIG. Can occur when is in a connected state and one of the lines 1L and 2L is in a dormant state without consideration of the assumed accident type.

FIG. 12 is a diagram showing an example of replacement of the assumed accident type by the supplementary control information selection unit 270. The upper figure of FIG. 12 is an excerpt of cases 3-33 to 3-40 from the control table of FIG. Further, the lower figure of FIG. 12 is a diagram showing how cases 3-33 to 3-40 have been replaced as a result of the replacement process.

For example, the supplementary control information selection unit 270 replaces the unused phase of the line 2L of case 3-33 shown in the upper figure of FIG. 12 with the fact that the R phase, the S phase, and the T phase of the line 2L are all accident phases. , Case 3-8 is selected. In the examples given in FIGS. 11 and 12, as a predetermined replacement rule for selecting a suitable replacement target, an example of a replacement process for selecting a case of a more severe system accident in which an unused phase is replaced with an accident phase is used. However, other reading rules may be used.

With such a configuration, in the power system stabilization system 3, at the timing when the control table storage unit 210 stores a new control table, the supplementary control information selection unit 270 extracts the missing element of the control table and replaces it in advance. By performing the processing, even if the control target device information corresponding to the system accident output from the accident detection unit 400 does not exist in the control table before the replacement process, suitable control information is based on the control table after the replacement process. Can be selected and appropriate control can be performed.

FIG. 13 is a diagram showing an example of a process flow when a system accident occurs, which involves a process of reading the control table in advance by the power system stabilization system 3.

First, the control table storage unit 210 outputs a new control table to the supplementary control information selection unit 270 (step S300). Next, the supplementary control information selection unit 270 extracts the assumed accident type for which the control target device information setting does not exist from the control table input from the control table storage unit 210 (step S302). Next, the supplementary control information selection unit 270 performs a replacement process for the extracted assumed accident type and outputs the output to the control table update unit 260 (step S304). Next, the control table update unit 260 updates the control table and reflects the replacement processing result of the supplementary control information selection unit 270 (step S306). Next, the accident detection unit 400 collects system information of the power system E (step S308). Next, the accident detection unit 400 determines whether or not a system accident has occurred from the collection result of the system information (step S310). Next, the control content selection unit 240 selects the control target device information based on the configuration of the system element at the time of the accident (step S312). Next, the control unit 300 outputs control information with respect to the control target device information (step S314). This ends a series of processes.

Here, the timing at which the power system stabilization system 3 of the third embodiment becomes effective will be described with reference to FIG. 7 described above. According to the power system stabilization system 3, for example, the control table replacement process can be started at the time t0 when the control table is received. Therefore, according to the power system stabilization system 3, the time (time t1 to t5) in which the control table and the system information are different can be further shortened as compared with the power system stabilization system 2.

As described above, according to the third embodiment, the supplementary control information selection unit 270 supplements the control table with information on the controlled devices of all possible accident types in advance, thereby performing the first embodiment. And, as compared with the second embodiment, the time for performing the replacement process after the occurrence of system switching or system accident is not required, and suitable control can be performed more quickly.

Further, according to the third embodiment, for example, in the power system E, the system switching may occur a plurality of times in succession due to the execution of the reclosing process or the like, and the latest system connection information is reflected. Even in a situation where the control table has not been created by the stability determination unit 140, it is not necessary to perform the reading process of the control table each time the switching occurs, so that the reading process can be suppressed to an appropriate number of times.

(Fourth Embodiment)
Next, the power system stabilization system 4 of the fourth embodiment will be described.

FIG. 14 is a configuration diagram of the power system stabilization system 4 of the fourth embodiment. The power system stabilization processing device 10C of the power system stabilization system 4 has supplementary control information of the central control unit 200C of the power system stabilization processing device 10C as compared with the power system stabilization processing device 10B of the third embodiment. The difference is that the output destination of the processing result of the selection unit 270 is the system model creation unit 120 of the central calculation unit 100. This is because, in a general power system stabilization system, the central processing unit and the central control unit are composed of separate devices, and the central processing unit has higher processing performance than the central control unit. In view of the fact that it may be configured by an apparatus, the replacement processing in the power system stabilization system 4 is integrated in the central processing unit 100 as much as possible. Hereinafter, the stability determination unit 140 and the supplementary control information selection unit 270 will be mainly described.

In the fourth embodiment, the supplementary control information selection unit 270 outputs the combination of the assumed accident type to be read and the corresponding control target device information to the system model creation unit 120. The system model creation unit 120 recreates the analysis system model based on the combination of the input assumed accident type and the corresponding controlled device information, and outputs it to the analysis condition setting unit 130. The analysis condition setting unit 130 sets the analysis condition and outputs it to the stability determination unit 140. The stability determination unit 140 performs a transient stability calculation based on the analysis conditions input from the analysis condition setting unit 130, and combines the assumed accident type input from the supplementary control information selection unit 270 with the control target device information. Is added / updated to the control table, and the added / updated control table is stored in the control table storage unit 210. Since the above analysis conditions are set based on the information that is the source of the addition / update of the control table from the supplementary control information selection unit 270, the processing load is reduced as compared with the case of creating the control table. The analysis conditions may be simplified as described above.

With such a configuration, in the power system stabilization system 4, at the timing when the control table storage unit 210 stores a new control table, the supplementary control information selection unit 270 extracts the missing element of the control table and replaces it in advance. By updating the control table in the stability determination unit 140 after the processing, the time required for updating the control table can be further shortened as compared with the power system stabilization system 3 of the third embodiment. Since it can be done, the time when there is no available control table can be further reduced.

As described above, according to the fourth embodiment, the supplementary control information selection unit 270 supplements the control target device information of all possible accident types to the control table by the stability determination unit 140. , The time required to update the control table can be shortened as compared with the third embodiment. Further, as compared with the third embodiment, a more reliable control table can be created by performing the transient stability calculation by the stability determination unit 140 even when the control table is updated or added.

(Fifth Embodiment)
Next, the power system stabilization system 5 of the fifth embodiment will be described.

FIG. 15 is a configuration diagram of the power system stabilization system 5 of the fifth embodiment. The power system stabilization processing device 10D of the power system stabilization system 5 creates a system model as compared with the central calculation unit 100 included in the power system stabilization processing device 10 of the power system stabilization system 1 of the first embodiment. The current model creation unit 120a and the estimation model creation unit 120b are provided in the unit 120, the current analysis condition setting unit 130a and the estimation analysis condition setting unit 130b are provided in the analysis condition setting unit 130, and the current stability determination unit 140 is provided with the current stability determination unit 140. The difference is that the determination unit 140a and the estimated stability determination unit 140b are provided. Hereinafter, the central calculation unit 100D will be mainly described.

In the fifth embodiment, the system model creation unit 120 uses the system information input from the system information collection unit 110 and the data of the control target device information recorded in advance as the current model creation unit 120a and the estimation model creation unit 120a. Output to 120b.

The current model creation unit 120a creates an analysis system current model representing the current system information based on the system information input from the system model creation unit 120 and the data of the control target device information recorded in advance. .. The current model creation unit 120a outputs the created analysis system current model to the system model creation unit 120.

Further, the system model creation unit 120 outputs the analysis system current model created by the current model creation unit 120a to the estimation model creation unit 120b. The estimation model creation unit 120b uses the analysis system current model input from the system model creation unit 120 to assume system switching expected in the future, and includes connection information and tidal current state at the time of switching occurrence in the future. Create a systematic future model for analysis that represents the systematic information of. The estimation model creation unit 120b outputs the created analysis system future model to the system model creation unit 120. The system model creation unit 120 outputs the analysis system current model and the analysis system future model to the analysis condition setting unit 130.

The analysis condition setting unit 130 outputs the analysis system current model input from the system model creation unit 120 to the current analysis condition setting unit 130a. The current state analysis condition setting unit 130a sets the current state analysis condition based on the analysis system current state model and the system element data recorded in advance. The current state analysis condition setting unit 130a outputs the current state analysis condition to the analysis condition setting unit 130.

Further, the analysis condition setting unit 130 outputs the analysis system future model input from the system model creation unit 120 to the estimation analysis condition setting unit 130b. The estimation analysis condition setting unit 130b sets the estimation analysis condition based on the analysis system future model and the system element data recorded in advance. The configuration of the system element used in the estimation analysis condition setting unit 130b includes all the configurations of the system element not used in the current analysis condition setting unit 130a. The estimation analysis condition setting unit 130b outputs the estimation analysis condition to the analysis condition setting unit 130. The analysis condition setting unit 130 outputs the current analysis condition and the estimation analysis condition to the stability determination unit 140.

The stability determination unit 140 outputs the current state analysis conditions input from the analysis condition setting unit 130 to the current state stability determination unit 140a. The current stability determination unit 140a performs a transient stability calculation based on the current analysis conditions input from the analysis condition setting unit 130, and sets the control target device information corresponding to the assumed accident type in the control table. The basic data is created and output to the stability determination unit 140.

Further, the stability determination unit 140 outputs the estimation analysis conditions input from the analysis condition setting unit 130 to the estimation stability determination unit 140b. The estimated stability determination unit 140b performs a transient stability calculation based on the estimated analysis conditions input from the analysis condition setting unit 130, and sets the control target device information corresponding to the assumed accident type in the control table. The basic data is created, and the created data is output to the stability determination unit 140. Here, the data that is the source of the control table output by the estimated stability determination unit 140b includes and supplements data that does not exist in the data that is the source of the control table that is currently output by the stability determination unit 140a. ..

The stability determination unit 140 aggregates the data that is the basis of the control table input from the current stability determination unit 140a and the data that is the basis of the control table input from the estimation stability determination unit 140b, and is a control table. To create. In the control table created by the stability determination unit 140, control target device information is set for all assumed accident aspects.

Here, the timing at which the power system stabilization system 5 of the fifth embodiment becomes effective will be described with reference to FIG. 7 described above. According to the power system stabilization system 5, the control table created by the central arithmetic unit 100D reflects, for example, at least both states 1 and 2. Therefore, according to the power system stabilization system 5, there is no time (time t1 to t5) in which the control table and the system information are different.

As described above, according to the fifth embodiment, by preparing a control table including all possible accident aspects in advance, the central control unit is compared with the first to fourth embodiments. Since it is not necessary to read the control table by the 200D, more suitable control can be performed more quickly.

The components in each of the above embodiments can be implemented in the following arrangement. FIG. 16 is a conceptual diagram showing the relationship between the power system stabilization system S, the power system E, and the power supply information network N. The power system stabilization system S may be any of the above-mentioned power system stabilization systems 1 to 5. Further, the power system stabilization system S may have the respective configurations shown in the above-mentioned power system stabilization systems 1 to 5.

As shown in FIG. 16, the power system stabilization system S connected to the power supply information network N of the power system E is arranged in, for example, the central calculation unit 100E, the central control unit 200E, and the plurality of electric stations 1 to M, respectively. The control / accident detection units 300E-1 to 300E-M are provided. An electric station is, for example, a substation. Hereinafter, when each electric station and each control device are not particularly distinguished, they are referred to as a control / accident detection unit 300E. The control / accident detection unit 300E also has the functions of the control unit 300 and the accident detection unit 400 shown in the first to fifth embodiments described above.

For example, the control / accident detection unit 300E-1 detects a system accident at the electric station 1 and outputs accident information to the central control unit 200E. The central control unit 200E compares the control information input from the central calculation unit 100E with the accident information input from the control / accident detection unit 300E-1, and is the target of the control process for stabilizing the power system E. Identify the equipment. For example, in the control information, information is set to control a circuit breaker (not shown) provided in the electric station 2 when the accident information that a disconnection has occurred is detected in the control / accident detection unit 300E-1. And. The central control unit 200E outputs a circuit breaker control command to the control / accident detection unit 300E-2 based on the control table. The control / accident detection unit 300E-2 outputs a control command to the target control device based on the circuit breaker control command input from the central control unit 200E.

According to at least one embodiment described above, when the control table has a reading function, the control target device information corresponding to the assumed accident type does not exist in the control table due to a system accident that occurs immediately after the system switching. Even if it is, it can be prevented from becoming an over-controlled or uncontrolled state.

Further, according to at least one embodiment described above, at the stage of creating or updating the control table, by having a control table corresponding to all assumed accident types, it is detected after a plurality of system switchings. Even in the case of a system accident of a power system, suitable stabilization control can be performed.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

1, 2, 3, 4, 5, S ... Power system stabilization system, 10, 10A, 10B, 10C, 10D ... Power system stabilization processing device, 100, 100D, 100E ... Central calculation unit, 200, 200A, 200B , 200C, 200D, 200E ... Central control unit, 300 ... Control unit, 300E-1, 300E-2, 300E-M ... Control / accident detection unit, 400 ... Accident detection unit, 110 ... System information collection unit, 120 ... System Model creation unit, 120a ... Current status model creation unit, 120b ... Estimated model creation unit, 130 ... Analysis condition setting unit, 130a ... Current status analysis condition setting unit, 130b ... Estimated analysis condition setting unit, 140 ... Stability determination unit, 140a ... Current stability determination unit, 140b ... Estimated stability determination unit, 210 ... Control table storage unit, 220 ... System connection status determination unit, 230 ... System connection status reading unit, 240 ... Control content selection unit, 250 ... Switching detection unit, 260 ... Control table update unit, 270 ... Supplementary control information selection unit, E ... Power system, N ... Power supply information network

Claims (6)

Collect system information including power system connection status and tidal current status,
Based on each of the plurality of assumed accident types in which the presence or absence of an accident is defined for each system element constituting the power system and the system information , the controlled device is used as an analysis condition in each of the plurality of assumed accident types. Perform a transient stability calculation to set and calculate the stability of the power system,
Based on the stability, a central calculation unit that generates a control table that selects the control target equipment required to maintain stability for each assumed accident type, and
From the accident detection unit that determines that a system accident has occurred, the connection information of the system elements at the time of the accident and the accident information of the power system are acquired.
It determines whether a system element according to a plurality of postulated accident type in the control table, and the system elements indicated by the acquired the connection information matches,
If it is determined that they match, it is determined in the control table that the control signal is output to the circuit breaker or disconnector corresponding to the controlled target device corresponding to the assumed accident type corresponding to the acquired accident information.
If it is determined that they do not match, it is determined that the control signal is output to the circuit breaker or disconnector corresponding to the controlled target device corresponding to the assumed accident type having a predetermined relationship with the acquired accident information in the control table. Central control unit and
Power system stabilization processing device. The predetermined relationship is a relationship in which the two are in agreement by assuming that an accident has occurred in the system elements that are partially matched and do not match.
The power system stabilization processing device according to claim 1. When the central control unit determines that the system elements related to a plurality of assumed accident types in the control table do not match the system elements indicated by the acquired connection information, the central control unit determines that the system elements do not match.
The transient stability calculation is performed on the premise of the system element indicated by the acquired connection information, and the control table is updated.
The power system stabilization processing device according to claim 1 or 2. When the central calculation unit determines by the central control unit that the system elements related to a plurality of assumed accident types in the control table do not match the system elements indicated by the acquired connection information, the central calculation unit determines.
The transient stability calculation is performed on the premise of the system element indicated by the acquired connection information, and the control table is updated.
The power system stabilization processing device according to claim 1 or 2. When the central calculation unit determines that the configuration of the system element has changed by referring to the system information,
The transient stability calculation is performed on the premise of the changed system element, and the control table is updated.
The power system stabilization processing device according to claim 1 or 2. The power system stabilization processing device according to any one of claims 1 to 5.
If the change of information relating to the control target device of the power system has occurred, or, if the system fault of said electric power system occurs, an accident for outputting information and the line elements relating to the control target device of the electric power system With the detector
Power system stabilization system with.

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