JP7104473B2 - Energy management system, power conversion control device, and power conversion control method - Google Patents

Description

The present invention relates to an energy management system.

In recent years, electric vehicles that run by driving a motor with the electric power supplied from the battery have been used, and there are cases where the battery is charged from a household outlet, and conversely, the electric power charged in the battery is used for household electricity. There are known cases of supplying equipment.

Patent Document 1 describes that the charging / discharging device charges the electric vehicle from the system power and the photovoltaic power generation device, and supplies the power discharged from the electric vehicle to the electric device via the distribution device. There is.

In addition, HEMS (Home Energy Management System) is a system for monitoring, displaying, and controlling the power consumption of each household. In HEMS, a HEMS controller (HEMS Controller) is a power device such as an EV (electric vehicle) or PV (photovoltaic power generation) via a PCS (Power Conditioning Subsystem). Connected to. A PCS is a device that regulates DC and AC power between various power devices and power systems. The HEMS controller constantly acquires status information of various electric power devices for monitoring and sends control information to the electric power devices for control.

Japanese Unexamined Patent Publication No. 2014-054010

However, assuming the case where the power from the power source in the home including the EV is supplied to the load in the home, it is necessary to consider the power supply-supply balance between the system power and the power supply and the load. Further, depending on the operation of the PCS, the electric power from the power source may not be used efficiently.

Therefore, an object of the present invention is to provide a technique for efficiently utilizing electric power from a power source.

In order to solve the above problems, the energy management system according to one aspect of the present invention is connected to a power system and a load via an AC power line, is connected to a power source via a DC power line, and stores a first power threshold. When the power supplied from the power system to the load is equal to or greater than the first power threshold, a power conversion device that converts the DC power from the DC power line into AC power and outputs the power to the AC power line, and a communication path. The measurement information measured by the DC power line and the AC power line is received from the power conversion device, and it is determined whether or not the measurement information satisfies the change condition, and the measurement is performed. When it is determined that the information satisfies the change condition, the power conversion control device includes a power conversion control device that generates control information instructing to change the first power threshold value and transmits the control information to the power conversion device. .. The power conversion device changes the first power threshold value stored in the power conversion device according to the control information.

According to one aspect of the present invention, the electric power from the power source can be efficiently used.

The configuration of the regional energy management system according to the embodiment of the present invention is shown. The configuration of the HEMS controller 100 is shown. The configuration of PCS300 is shown. The PCS performance information table 111 is shown. The PCS power threshold table 112 is shown. The charge / discharge plan table 113 is shown. The suppression of EV discharge power by the UPR power threshold is shown. It shows the improvement of EV discharge power by reducing the UPR power threshold. Indicates the stoppage of the PCS300 due to the UPR power threshold. It shows the avoidance of stopping the PCS300 due to the increase of the UPR power threshold. The power threshold management process is shown. A modified example of the power threshold management process is shown.

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a regional energy management system according to an embodiment of the present invention.

The regional energy management system of this embodiment includes a HEMS center 500 and a plurality of HEMS 400s. The plurality of HEMS 400s are provided in each of a plurality of homes located in a specific area. The HEMS 400 includes a HEMS controller 100, a PCS300, a PV14, a charge / discharge stand 15, and an EV16. In this figure, the solid line represents the power line and the broken line represents the communication line. The communication line may be a wired communication path or a wireless communication path.

The HEMS controller 100 is connected to the PCS 300 via a communication line. The HEMS controller 100 is connected to the router 520 via a communication line. The PCS 300 is connected to the distribution board 410 via a power line (AC power line). The PCS300 is connected to the PV14 via a power line (DC power line). The PCS 300 is connected to the charge / discharge stand 15 via a power line (DC power line). The charge / discharge stand 15 is connected to the EV 16 via a power line. The distribution board 410 is connected to the power meter 420 via the power line and is connected to the load 150 via the power line. The power meter 420 is connected to the power system 600 via a power line and is connected to the PCS 300 via a communication line. The power meter 420 measures the purchased system power (purchased power) flowing from the power system 600 to the distribution board 410 as the purchased system power measurement value, and sells the power flowing from the distribution board 410 to the power system 600 (reverse power flow power). ) Is measured as the power sale power measurement value, and the purchased system power measurement value and the power sale power measurement value are transmitted to the PCS300 via the communication line. The router 520 is connected to the communication network 510. The HEMS center 500 is connected to the communication network 510. Hereinafter, devices such as PV14 and EV16 that can supply DC power to the PCS300 by power generation or discharge in the HEMS 400 will be referred to as a power source. The power source may be both PV14 and EV16, or may be one of them. The power source may include another renewable energy power generation device such as a wind power generation device, or may include a storage battery.

The HEMS 400 is a system that monitors, displays, and controls the power supply and demand of each household. If the home has a power source, the power supply is monitored, displayed and controlled by the HEMS 400. The PCS300, PV14, charge / discharge stand 15, EV16, and power meter 420 are subject to monitoring, display, and control by HEMS.

PV14 is an electric power device that generates electricity by sunlight. The electric power generated by the PV 14 is supplied to the EV 16, the load 150, or the electric power system 600 in the home via the PCS 300.

The charge / discharge stand 15 has a connector for connecting to the EV 16. Instead of the charge / discharge stand 15, the PCS 300 may be provided with a connector.

The EV 16 is an electric vehicle that runs on the electric power stored in the built-in storage battery. The EV 16 is connected to the PCS 300 via the charge / discharge stand 15. The PCS300 can charge the storage battery of the EV 16 by using the electric power from the power system 600 and the PV14. Further, the electric power stored in the storage battery of the EV 16 can be supplied to the load 150 and the electric power system 600 via the PCS 300. The start and stop of charging the EV 16 can be controlled from both the charge / discharge stand 15 and the HEMS controller 100. Instead of EV15, another transportation machine such as a plug-in hybrid vehicle or an electric motorcycle that includes a storage battery and can be connected to a power line to charge the storage battery may be used. As a result, the PV14 and the EV16 can be effectively used by charging the EV15 using the surplus power generated by the PV14 and reducing the power from the power system 600 by discharging the EV15. ..

The PCS300 is connected to electric power devices such as PV14, charge / discharge stand 15, EV16, etc., adjusts the power input / output of those power devices, and measures the state of the power input / output of each power device. Since there are DC power and AC power in the power input and output between the electric power device and the PCS 300, the PCS 300 also converts DC and AC power. Further, since the HEMS 400 of the present embodiment includes the EV 16 for discharging, the PCS 300 can handle both the flow of power in the direction from the power system 600 to the power supply and the direction from the power supply to the power system 600. It is for PCS. The PCS 300 generates and stores PCS actual information indicating the state measured by the PCS 300 and the power meter 420, and transmits the PCS 300 to the HEMS controller 100. For example, the PCS300 generates a PV power generation power measurement value by measuring the PV power generation power output from the PV14 to the distribution board 410 by the power generation of the PV14, and the EV output from the PCS300 to the EV16 for charging the EV16. The EV charge power measurement value is generated by measuring the charge power, and the EV discharge power measurement value is generated by measuring the EV discharge power output from the EV 16 to the distribution board 410 by discharging the EV 16.

The HEMS center 500 acquires electric power-related information that affects the local electric power supply and demand, such as regional weather information, from the outside, and acquires PCS actual information from a plurality of HEMS 400s. The HEMS center 500 further creates charge / discharge plan information of the EV 16 in the plurality of HEMS 400s based on the power supply / demand information and the PCS actual information, and transmits the charge / discharge plan information to the plurality of HEMS 400s via the communication network 510. That is, the HEMS center 500 adjusts the power supply and demand in the area by planning the charging and discharging in the area.

The HEMS controller 100 is a controller that controls the HEMS 400, acquires and stores state information from the PCS 300 at a preset timing, and controls a power supply using the PCS 300 at a preset timing.

FIG. 2 shows the configuration of the HEMS controller 100.

The HEMS controller 100 includes a CPU (Central Processing Unit) 101, an input unit 103, an output unit 104, a storage unit 110, and a communication unit 109. The input unit 103 is, for example, an input device such as a keyboard or buttons. The output unit 104 is, for example, a display device such as a display. The communication unit 109 communicates with the PCS300, the router 520, and the like according to the instruction from the CPU 101.

The storage unit 110 is a RAM (Random Access Memory), an HDD (Hard Disk Drive), a flash memory, or the like. The storage unit 110 stores programs for the control instruction unit 106, the screen display unit 107, and the control instruction calculation unit 108. The storage unit 110 further stores the PCS actual information table 111, the PCS power threshold table 112, the charge / discharge planning table 113, and the like.

The CPU 101 executes the control instruction unit 106, the screen display unit 107, and the control instruction calculation unit 108 according to the program stored in the storage unit 110.

The control instruction calculation unit 108 uses the communication unit 109 to periodically receive the PCS actual information from the PCS 300 at preset time intervals, and stores the received PCS actual information as the PCS actual information table 111 as the storage unit 110. Save to. The control instruction calculation unit 108 further calculates the PCS power threshold value, which is a set value of the PCS 300, based on the PCS performance information table 111 and the PCS power threshold value table 112, and stores the calculated PCS power threshold value in the PCS power threshold value table 112. .. The PCS power threshold is an RPR (reverse power relay) power threshold for detecting reverse power flowing from the HEMS 400 to the power system 600, a power threshold of the power system 600, or a power failure from the power system 600 to the HEMS 400. UPR (underpower relay) power threshold, which is a power threshold for detecting a shortage of power to the power. The control instruction calculation unit 108 further receives the charge / discharge plan from the HEMS center 500 using the communication unit 109, and stores the charge / discharge plan as the charge / discharge plan table 113 in the storage unit 110.

The control instruction unit 106 transmits the PCS control information including the PCS power threshold value to the PCS 300 by using the communication unit 109. The control instruction unit 106 further transmits PCS control information including the charge / discharge power planned value, which is the current planned value of the charge / discharge power, from the charge / discharge planning table 113 to the PCS 300 using the communication unit 109. The planned charge / discharge power value is either a planned charge power value which is a planned value of the charge power of the EV 16 or a planned discharge power value which is a planned value of the discharge power of the EV 16.

The screen display unit 107 causes the output unit 104 to display the contents of the PCS actual information table 111, the PCS power threshold table 112, the charge / discharge planning table 113, and the like. For example, the screen display unit 107 may display the PCS power threshold value on the output unit 104, or may display the charge / discharge power plan value on the output unit 104.

The present invention can be applied to various energy management systems (xEMS) such as a FEMS (Factory Energy Management System) installed in a factory and a building energy management system installed in a building instead of the HEMS 400. Further, the HEMS center 500 may be a controller of CEMS (Community Energy Management System) provided in the area.

Hereinafter, the PCS300 will be described.

FIG. 3 shows the configuration of the PCS 300.

The PCS300 includes a solar power input unit 20, a grid power input / output unit 21, an automobile power input / output unit 22, a DC-DC power conversion unit 23a, an AC-DC power conversion unit 23b, a DC-DC power conversion unit 23c, and a control. A unit 25, a communication unit 27, and a storage unit 28 are included. In this figure, the solid line represents the power line and the broken line represents the communication line.

The photovoltaic power generation input unit 20 is connected to the PV 14 via a power line and receives the DC power generated by the PV 14. The grid power input / output unit 21 is connected to the distribution board 410 via a power line, receives AC power from the power system 600 from the distribution board 410, and receives AC power output from the AC-DC power conversion unit 23b. It is sent to the distribution board 410. The automobile power input / output unit 22 is connected to the charge / discharge stand 15 via a power line, receives DC power discharged by the EV 16 via the charge / discharge stand 15, and is a DC output by the DC-DC power conversion unit 23c. Electric power is sent to the EV 16 via the charge / discharge stand 15. The DC-DC power conversion unit 23a converts the voltage of the DC power from the photovoltaic power input unit 20. The DC-DC power conversion unit 23c converts the DC power voltage from the automobile power input / output unit 22 and sends it to the AC-DC power conversion unit 23b, or the DC-DC power conversion unit 23a and the AC-DC power conversion unit. The DC power voltage from 23b is converted and sent to the automobile power input / output unit 22. The AC-DC power conversion unit 23b, as an inverter, converts the DC power from the DC-DC power conversion unit 23a and the DC-DC power conversion unit 23c into AC power and sends it to the system power input / output unit 21, or as a converter. , The AC power from the system power input / output unit 21 is converted into DC power and sent to the DC-DC power conversion unit 23c.

The system power input / output unit 21 of this embodiment is connected to the distribution board 410 by a single-phase two-wire power line. The power line may be a single-phase three-wire system, a three-phase three-wire system, or the like. Further, the PCS power threshold value may be represented by an electric energy, a current, or the like instead of the electric power.

The communication unit 27 is connected to the HEMS controller 100 via a communication line, receives PCS control information from the HEMS controller 100, stores it in the storage unit 28, and stores the PCS actual information stored in the storage unit 28 in the HEMS controller 100. Send. Further, the communication unit 27 receives the measured value of the electric power from the wattmeter 420.

The control unit 25 stores the measured value of the power measured by the DC-DC power conversion unit 23a, the AC-DC power conversion unit 23b, the DC-DC power conversion unit 23c, and the power meter 420 in the storage unit 28 as PCS actual information. do.

The control unit 25 stores the PCS control information received from the HEMS controller 100 in the storage unit 28, and based on the PCS control information, the DC-DC power conversion unit 23a, the AC-DC power conversion unit 23b, and the DC-DC power. The conversion unit 23c is controlled. The PCS control information indicates a PCS power threshold set in the PCS 300 or a planned charge / discharge power value for EV16. When the charge / discharge power planned value indicates the charged power planned value which is the planned value of the charging power of EV16, the control unit 25 is the DC-DC power conversion unit 23a, the AC-DC power conversion unit 23b, and the DC-DC power conversion unit. By controlling 23c, the electric power up to the planned charge power value is converted into the DC-DC power conversion unit 23c and sent to the automobile power input / output unit 22. When the planned charge / discharge power value indicates the planned discharge power value which is the planned value of the discharge power of EV16, the control unit 25 is the DC-DC power conversion unit 23a, the AC-DC power conversion unit 23b, and the DC-DC power conversion unit. By controlling the 23c, the electric power up to the planned discharge power value is received from the automobile power input / output unit 22 and converted into the DC-DC power conversion unit 23c.

The information stored in the HEMS controller 100 will be described below.

FIG. 4 shows the PCS performance information table 111.

The PCS performance information table 111 has entries for each measured time. The entries corresponding to a certain time are the time, the PV generated power measurement value [W] measured at the time, the purchased system power measurement value [W] measured at the time, and the purchased system power measurement value [W] measured at the time. It includes the power selling power measurement value [W], the EV charging power measurement value [W] measured at the time, and the EV discharge power measurement value [W] measured at the time. The PCS performance information table 111 may have entries for the latest time, or may have a plurality of entries corresponding to a plurality of times. The power meter 420 may be connected to the HEMS controller 100 via a communication line. In this case, the HEMS controller 100 receives the purchased system power measurement value and the power sale power measurement value measured from the power meter 420, and registers them in the PCS actual information table 112.

FIG. 5 shows the PCS power threshold table 112.

The PCS power threshold table 112 shows the PCS power threshold set in the PCS 300. The PCS power threshold includes an RPR power threshold and a UPR power threshold. The RPR power threshold value may be referred to as an RPR set value. The UPR power threshold is sometimes referred to as the UPR set value.

FIG. 6 shows the charge / discharge planning table 113.

The charge / discharge plan table 113 shows the charge / discharge plan received from the HEMS center 500 and has an entry for each time. The entries corresponding to a certain time are the time, the planned charge power [W] which is the planned value of the EV charging power at the time, and the planned discharge power [W] which is the planned value of the EV discharge power at the time. ] And is included. If one of the planned charge power value and the planned discharge power value is positive, the other is 0.

Hereinafter, the operation of the PCS 300 based on the PCS power threshold value will be described.

The PCS power threshold may be, for example, the UPR power threshold defined by standards such as grid interconnection regulations, and is about 3% of the rated power of the output (inverter) from the PCS 300 to the distribution board 410. The RPR power threshold is, for example, about 5% of the rated power.

In the present embodiment, the UPR standard value and the UPR permissible deviation are determined with respect to the UPR power threshold value based on the standard, and the UPR permissible range is determined based on them. The UPR allowable range is determined by the UPR lower limit value and the UPR upper limit value. The UPR lower limit is the UPR standard value-UPR tolerance, and the UPR upper limit is the UPR standard value + UPR tolerance. For example, the UPR standard value is 3% of the rated power, and the UPR tolerance is 1% of the rated power.

Further, in the present embodiment, the RPR standard value and the RPR permissible deviation are determined with respect to the RPR power threshold value based on the standard, and the RPR permissible range is determined based on them. The RPR permissible range is determined by the RPR lower limit value and the RPR upper limit value. The lower limit of RPR is RPR standard value-RPR tolerance, and the upper limit of RPR is RPR standard value + RPR tolerance. For example, the RPR standard value is 5% of the rated power, and the RPR tolerance is 1% of the rated power.

The PCS 300 stops the PCS 300 when the measured power selling power exceeds the RPR power threshold value for a certain period of time based on the PCS actual information. After that, when the user performs a return operation on the PCS 300, the PCS 300 resumes its operation.

Here, the power consumption by the load 150 is referred to as household power consumption. When the household power consumption is equal to or less than the UPR power threshold, the PCS300 does not convert and output the power from the power source in order to prioritize the purchased system power over the EV discharge power and the PV power generation power. When the UPR power threshold is insufficient with respect to the household power consumption, the PCS300 compensates for the shortage with the EV discharge power up to the planned discharge power value. In other words, when the purchased system power is equal to or higher than the UPR power threshold value, the PCS 300 converts the power from the power source and outputs it to the distribution board 410. As a result, the EV discharge power becomes the lower power of the difference value obtained by subtracting the UPR power threshold from the household power consumption and the planned discharge power value. If the total of the UPR power threshold and the EV discharge power is insufficient with respect to the household power consumption, the shortage is supplemented by the purchased system power. If the UPR power threshold is insufficient with respect to household power consumption, the PCS300 may make up for the shortage with PV generated power. In this case, if the total of the UPR power threshold, the EV discharge power, and the PV power generation power is insufficient with respect to the household power consumption, the shortage is supplemented by the purchased system power.

Hereinafter, a specific example of the operation of the PCS 300 based on the PCS power threshold value will be described. Here, for the sake of simplicity, the PV generated power is set to 0.

First, as a comparative example, the operation of the PCS when the UPR power threshold value is not changed will be shown.

FIG. 7 shows the suppression of EV discharge power by the UPR power threshold of the comparative example.

The state A1 indicates a state in which the UPR power threshold value is set to 100 W, the planned discharge power value is set to 70 W, and the household power consumption is 170 W. In this state A1, the purchased system power becomes 100 W equal to the UPR power threshold, and the EV discharge power becomes 70 W equal to the difference value obtained by subtracting the UPR power threshold from the household power consumption.

In the subsequent state A2, when the household power consumption is reduced to 120 W, the EV discharge power is 70 W, so that the purchased system power is temporarily reduced to 50 W.

In the subsequent state A3, the purchased system power increases to 100 W, which is equal to the UPR power threshold, and the difference value obtained by subtracting the UPR power threshold from the household power consumption becomes 20 W. Therefore, the EV discharge power of the PCS300 becomes equal to or less than the difference value. The EV discharge power is suppressed as described above. As a result, the EV discharge power becomes 20 W.

According to this operation, the EV discharge power becomes significantly lower than the planned discharge power value.

Next, a case where the UPR power threshold value is reduced by the HEMS controller 100 of the present embodiment is shown.

FIG. 8 shows the improvement of EV discharge power by reducing the UPR power threshold.

In the state B1, the planned discharge power value and the household power consumption are the same as those in the state A1, but the UPR power threshold is reduced from 100 W to 70 W. In this state B1, as in the state A1, the purchased system power becomes 70 W, which is equal to the UPR power threshold, and the EV discharge power becomes 100 W, which is equal to the difference value obtained by subtracting the UPR power threshold from the household power consumption.

In the subsequent state B2, when the household power consumption is reduced to 120 W, the EV discharge power is 100 W, so that the purchased system power is temporarily reduced to 20 W.

In the subsequent state B3, the purchased system power increases to 70 W, which is equal to the UPR power threshold, and the difference value obtained by subtracting the UPR power threshold from the household power consumption becomes 50 W. Therefore, the PCS300 adjusts the power received from the EV 16 to the difference value. To suppress. As a result, the EV discharge power becomes 50 W.

According to this operation, the EV discharge power can be increased and the purchased system power can be reduced by reducing the UPR power threshold as compared with the state A3.

Next, as a comparative example, the operation of the PCS when the UPR power threshold value is not changed will be shown.

FIG. 9 shows the stoppage of the PCS300 due to the UPR power threshold of the comparative example.

The state C1 indicates a state in which the UPR power threshold is set to 50 W, the RPR power threshold is set to 80 W, the discharge power planned value is set to 150 W, and the household power consumption is 200 W. In this state C1, the purchased system power becomes 50 W, which is equal to the UPR power threshold, and the EV discharge power becomes 150 W, which is equal to the difference value obtained by subtracting the UPR power threshold from the household power consumption.

In the subsequent state C2, when the household power consumption is reduced to 50 W, the EV discharge power is 150 W, so that the reverse power flow to the power system 600 is temporarily the value obtained by subtracting the household power consumption from the EV discharge power. It becomes a certain 100W.

In the subsequent state C3, since the reverse power flow power exceeds the RPR power threshold value, the PCS300 is stopped and the power from the EV 16 is not converted. As a result, the EV discharge power becomes 0 W, and the purchased system power becomes 50 W, which is equal to the household power consumption.

According to this operation, since the PCS 300 is stopped, the power from the EV 16 cannot be used even if the household power consumption subsequently exceeds the UPR power threshold. Further, in order to use the electric power from the EV 16 after that, work and time for restoring the PCS 300 are required.

Next, a case where the UPR power threshold value is increased by the HEMS controller 100 of the present embodiment is shown.

FIG. 10 shows avoiding the PCS300 from stopping due to an increase in the UPR power threshold.

In the state D1, the RPR power threshold, the planned discharge power value, and the household power consumption are the same as in the state C1, but the UPR power threshold is increased from 50 W to 80 W. In this state D1, as in the state C1, the purchased system power becomes 80 W, which is equal to the UPR power threshold, and the EV discharge power becomes 120 W, which is equal to the difference value obtained by subtracting the UPR power threshold from the household power consumption.

In the subsequent state D2, when the household power consumption is reduced to 50 W, the EV discharge power is 120 W, so that the reverse power flow to the power system 600 is temporarily the value obtained by subtracting the household power consumption from the EV discharge power. It becomes a certain 70W.

In the subsequent state D3, the PCS300 does not stop because the reverse power flow does not exceed the RPR power threshold. Further, since the household power consumption is lower than the UPR power threshold, the PCS300 does not receive the power from the EV16. As a result, the EV discharge power becomes 0 W, and the purchased system power becomes 50 W, which is equal to the household power consumption.

According to this operation, the PCS300 does not stop as compared with the state C3, so that the work of returning the PCS300 is not required. Further, when the household power consumption exceeds the UPR power threshold value after that, the power from the EV 16 can be immediately converted and supplied to the load 150.

As described above, if the UPR power threshold is too high, the ratio of the purchased system power to the household power consumption becomes large, and the EV discharge power is suppressed. If the UPR power threshold is too low, the PCS300 will stop when reverse power flow occurs.

Hereinafter, the power threshold value management process in which the HEMS controller 100 manages the UPR power threshold value of the PCS300 in order to suppress the EV discharge power and prevent the PCS300 from stopping will be described.

FIG. 11 shows the power threshold management process.

The HEMS controller 100 starts the power threshold management process at predetermined management time intervals. The management time is, for example, 1 minute.

In S110, the HEMS controller 100 performs a PCS performance information collection process for collecting PCS performance information from the PCS 300. The PCS actual information includes a PV generated power measurement value, a purchased system power measurement value, a power sale power measurement value, an EV charging power measurement value, and an EV discharge power measurement value. After that, in S120, the HEMS controller 100 performs the PCS actual information registration process for registering the collected PCS actual information in the PCS actual information table.

After that, in S210, the HEMS controller 100 acquires the PV generated power measurement value, the purchased system power measurement value, the selling power measurement value, the EV charging power measurement value, and the EV discharge power measurement value from the PCS performance information table. Perform the acquisition process. After that, in S220, the HEMS controller 100 performs a PCS power threshold acquisition process for acquiring the UPR power threshold from the PCS power threshold table.

After that, in S310, the HEMS controller 100 sets the measured value of the power selling power as the reverse power flow power, and determines whether or not the reverse power flow power is positive.

When the reverse power flow power is determined to be positive (S310: Y), the HEMS controller 100 in S320 adds a predetermined UPR addition value to the UPR power threshold value to obtain a new UPR power threshold value (indicated value). The UPR power threshold addition process for calculating the above is performed. This makes it possible to increase the UPR power threshold. If the UPR addition value is excessively large, it leads to an increase in the purchased system power and suppression of the EV discharge power. Therefore, it is desirable that the UPR addition value is smaller than the UPR allowable deviation.

After that, in S410, the HEMS controller 100 stores the new UPR power threshold in the PCS 300 by transmitting the PCS control information indicating the new UPR power threshold to the PCS 300, and sets the new UPR power threshold in the PCS power threshold table 112. The UPR power threshold update process to be stored in is performed, and this flow is terminated. Here, the HEMS controller 100 limits the new UPR power threshold value to the UPR allowable range when the new UPR power threshold value is outside the UPR allowable range. For example, if the new UPR power threshold is below the UPR lower limit, the HEMS controller 100 equalizes the new UPR power threshold to the UPR lower limit. Further, when the new UPR power threshold value exceeds the UPR upper limit value, the HEMS controller 100 makes the new UPR power threshold value equal to the UPR upper limit value.

When it is determined that the reverse power flow power is not positive (S310: N), the UPR power controller 100 calculates a new UPR power threshold (indicated value) by subtracting the UPR subtraction value from the UPR power threshold in S350. Perform threshold subtraction processing. If the UPR subtraction value is excessively large, it leads to an increase in reverse power flow and a stoppage of the PCS. Therefore, it is desirable that the UPR subtraction value is smaller than the UPR allowable deviation.

After that, in S360, the HEMS controller 100 calculates the household power consumption measured value which is the measured value of the household power consumption based on the PCS actual information table, and UPR which is the target value of the UPR power threshold based on the household power consumption measured value. The power threshold target value is calculated, and it is determined whether or not the UPR power threshold is smaller than the UPR power threshold target value. Here, the HEMS controller 100 calculates the measured value of household power consumption by the following equation.

Household power consumption measurement value = PV power generation power measurement value + purchase system power measurement value-selling power measurement value-EV charging power measurement value + EV discharge power measurement value

Further, the HEMS controller 100 calculates the UPR power threshold target value by multiplying the household power consumption measurement value by a predetermined UPR coefficient. The UPR coefficient is greater than 0 and less than 1, for example 0.6.

When it is determined that the UPR power threshold is equal to or greater than the UPR power threshold target value (S360: N), the HEMS controller 100 shifts the process to S350. As a result, the HEMS controller 100 can reduce the UPR power threshold value until the UPR power threshold value becomes smaller than the UPR power threshold value. In other words, if the current UPR power threshold is less than the UPR power threshold target value, the HEMS controller 100 does not reduce the UPR power threshold. The HEMS controller 100 may make the UPR power threshold equal to the UPR power threshold target value.

When it is determined that the UPR power threshold value is smaller than the UPR power threshold value (S360: Y), the HEMS controller 100 in S410 transmits the PCS control information indicating the UPR power threshold value to the PCS300 to set the UPR power threshold value to the PCS300. Save to and exit this flow.

In S410, the HEMS controller 100 may transmit PCS control information indicating the amount of change in the UPR power threshold to the PCS 300 instead of the UPR power threshold. Further, the PCS 300 may store the increase amount and the decrease amount of the UPR power threshold value. In this case, in S410, the HEMS controller 100 transmits PCS control information indicating an increase or decrease of the UPR power threshold to the PCS 300 instead of the UPR power threshold, and the PCS 300 increases the UPR power threshold according to the PCS control information. You may increase the amount or decrease the UPR power threshold by the amount of decrease.

The screen display unit 107 causes the output unit 104 to display a screen showing the state of the HEMS 400. For example, the screen displays the UPR power threshold, the EV discharge power measurement value, the purchased system power measurement value, the household power consumption measurement value, and the like.

According to the above power threshold management process, the HEMS controller 100 can optimize the UPR power threshold. This makes it possible to prevent the PCS300 from stopping due to the UPR power threshold being too low, and to prevent excessive suppression of the EV discharge power due to the UPR power threshold being too high. Further, the HEMS controller 100 can change the UPR power threshold according to the measured value of household power consumption by calculating the UPR power threshold target value. The administrator of HEMS400 can set the ratio of the purchased system power to the power supplied from the power source by determining the UPR coefficient.

Hereinafter, a modified example of the power threshold value management process will be described.

FIG. 12 shows a modified example of the power threshold management process.

In a modified example of the power threshold management process, the HEMS controller 100 starts the actual collection process at a predetermined collection time interval, and starts the power threshold adjustment process at a predetermined adjustment time interval. The collection time is, for example, 1 minute, and the adjustment time is sufficiently longer than the collection time, for example, 1 week.

When the actual result collection process is started, the HEMS controller 100 executes S110 and S120 in the same manner as the power threshold value management process, and ends this flow.

According to the above PCS record collection process, the HEMS controller 100 can collect and store the PCS record information at the collection time interval.

When the power threshold adjustment process is started, in S210b, the HEMS controller 100 sets the measurement period from the previous power threshold adjustment process to the present, and within the measurement period, the PV generated power measurement value, the purchased system power measurement value, and the power sale. The power measurement value, the EV charging power measurement value, and the EV discharge power measurement value are acquired from the PCS actual information table. After that, in S220, the HEMS controller 100 acquires the UPR power threshold, the UPR addition value, and the UPR subtraction value from the PCS power threshold table.

After that, in S310b, the HEMS controller 100 sets the measured power selling power as the reverse power flow power, and determines whether or not the maximum value of the reverse power flow power within the measurement period is positive.

When it is determined that the maximum value of the reverse power flow power is positive (S310b: Y), S320 and S410 are executed as in the power threshold value management process, and this flow is terminated.

When it is determined that the maximum value of the reverse power flow power is not positive (S310b: N), the HEMS controller 100 calculates a new UPR power threshold by subtracting the UPR subtraction value from the UPR power threshold in S350.

After that, in S360b, the HEMS controller 100 calculates the maximum value of the household power consumption measurement value within the measurement period, calculates the UPR power threshold target value based on the maximum value of the household power consumption measurement value, and the UPR power threshold is UPR. It is determined whether or not it is smaller than the power threshold target value. Here, the HEMS controller 100 calculates the UPR power threshold target value by multiplying the maximum value of the household power consumption measurement value by the UPR coefficient.

When it is determined that the UPR power threshold value is smaller than the UPR power threshold target value (S360b: Y), the HEMS controller 100 stores the UPR power threshold value in the PCS300 by transmitting the UPR power threshold value to the PCS300 in S410. End the flow.

According to the above power threshold adjustment process, the HEMS controller 100 can optimize the UPR power threshold based on the PCS actual information within the measurement period. Further, as compared with the power threshold value management process, this modification can reduce the load on the HEMS controller 100.

When the UPR power threshold is changed by the power threshold management process or the power threshold adjustment process, the screen display unit 107 may display the information indicating the change of the UPR power threshold on the output unit 104. As a result, the administrator can recognize the change of the UPR power threshold value and the current UPR power threshold value.

According to this embodiment, the HEMS controller 100 can change the UPR power threshold value of the PCS 300 when the measured value of the power in the HEMS 400 satisfies the change condition. The first change condition is, for example, that there is no reverse power flow and the UPR power threshold exceeds the UPR power threshold target value. The second change condition is, for example, that there is reverse power flow. Further, by changing the UPR power threshold value according to the measured value by the HEMS controller 100, it is possible to suppress the output of the power supply and prevent the PCS 300 from stopping. Further, by using the EV 16 and PV as the power source, the EV 16 can be charged by using the generated power of the PV 14, and the discharge power of the EV 16 can be supplied to the load 150. As a result, the purchased system power can be reduced and PV14 and EV16 can be used efficiently. Further, the HEMS center 500 creates a charge / discharge plan, and the HEMS controller 100 controls the charge / discharge of the EV 16 based on the charge / discharge plan, so that the power supply and demand in the region can be adjusted.

The terms for expressing the present invention will be described. HEMS400 or the like may be used as the energy management system. As the power conversion control device, a HEMS controller 100 or the like may be used. PCS300 or the like may be used as the power conversion device. EV16, PV14 and the like may be used as the power source. PCS actual information or the like may be used as the measurement information. PCS control information or the like may be used as the control information. The UPR power threshold value or the like may be used as the first power threshold value. As the second power threshold value, an RPR power threshold value or the like may be used. As the upper control device, a HEMS center 500 or the like may be used. The charge / discharge power planned value or the like may be used as the storage battery control information. Charge / discharge planning information and the like may be used as the planning information. As the coefficient, the UPR coefficient or the like may be used. As the communication network, a communication network 510, a router 520, or the like may be used.

14 ... PV 15 ... Charging / discharging stand 16 ... EV 100 ... HEMS controller 101 ... CPU 103 ... Input unit 104 ... Output unit 109 ... Communication unit 110 ... Storage unit 150 ... Load 300 ... PCS 410 ... Distribution board 420 ... Power meter 500 … HEMS center 510… Communication network 520… Router 600… Power system

Claims (14)

It is connected to the power system and load via the AC power line, connected to the power supply via the DC power line, stores the first power threshold, and the power supplied from the power system to the load is equal to or higher than the first power threshold. In some cases, a power conversion device that converts DC power from the DC power line into AC power and outputs it to the AC power line.
It is connected to the power conversion device via a communication path, receives measurement information measured on the DC power line and the AC power line from the power conversion device , and reverses based on the information on reverse power flow power included in the measurement information. It is determined whether or not the change condition that there is no power flow is satisfied, and when it is determined that the measurement information satisfies the change condition, control information instructing to reduce the first power threshold is generated, and the control information is generated. A power conversion control device that transmits control information to the power conversion device, and
With
The power conversion device changes the first power threshold value stored in the power conversion device according to the control information.
Energy management system. The power conversion control device stores the first power threshold value and stores the first power threshold value.
The power conversion control device calculates a target value of the first power threshold based on the power consumption measurement value included in the measurement information, and there is no reverse power flow from the power conversion device to the power system and the first power conversion device. When it is determined whether or not the measurement information satisfies the first change condition with the power threshold exceeding the target value as the first change condition, and it is determined that the measurement information satisfies the first change condition. Generates the control information instructing to reduce the first power threshold, and reduces the first power threshold stored in the power conversion control device based on the control information.
The energy management system according to claim 1. It is connected to the power system and load via the AC power line, connected to the power supply via the DC power line, stores the first power threshold, and the power supplied from the power system to the load is equal to or higher than the first power threshold. If there is, the DC power from the DC power line is converted into AC power and output to the AC power line. , Memorize the second power threshold,reverseIf the tidal current exceeds the second power threshold, the conversion is stopped.With a power converter,
It is connected to the power conversion device via a communication path, receives measurement information measured on the DC power line and the AC power line from the power conversion device, and is based on information on reverse power flow power included in the measurement information. When it is determined whether or not the measurement information satisfies the second change condition with the presence of the reverse power flow as the second change condition, and when it is determined that the measurement information satisfies the second change condition, the said Indicates to increase the first power thresholdSystemGenerate your information and the control informationTo the power converterPower conversion controller When,
With
The power conversion device is the power conversion device according to the control information. The first power threshold stored inChangeRu,
workmanEnergy management system. The power conversion control device calculates the power consumption by the load based on the power consumption measurement value , and calculates the target value by multiplying the power consumption by a positive coefficient smaller than 1 predetermined.
The energy management system according to claim 2 . When the power conversion control device determines that the measurement information satisfies the first change condition, the power conversion control device reduces a predetermined subtraction value from the first power threshold stored in the power conversion control device. The indicated value of the first power threshold is calculated, the control information indicating the indicated value is generated, and the first power threshold stored in the power conversion control device is replaced with the indicated value.
The power conversion device replaces the first power threshold value stored in the power conversion device with the indicated value according to the control information.
The energy management system according to claim 2 or 4. When the power conversion control device determines that the measurement information satisfies the second change condition, the power conversion control device adds a predetermined additional value to the first power threshold value stored in the power conversion control device. Calculate the indicated value of the first power threshold ,
The energy management system according to claim 3 . The power source includes a storage battery.
The power conversion control device generates storage battery control information indicating either charge power or discharge power of the storage battery, and transmits the storage battery control information to the power conversion device.
When the storage battery control information indicates the charging power, the power conversion device converts the AC power from the AC power line into DC power and outputs the DC power line, and the storage battery control information indicates the discharge power. Converts DC power from the DC power line into AC power and outputs it to the AC power line.
The energy management system according to any one of claims 1 to 6. The power source includes an electric vehicle containing the storage battery.
The energy management system according to claim 7. The power conversion control device is connected to a higher-level control device via a communication network, receives plan information indicating a plan for the charge power and the discharge power from the higher-level control device, and controls the storage battery based on the plan information. Generate information,
The energy management system according to claim 8. The power conversion control device causes a display device to display information indicating a change in the first power threshold value.
The energy management system according to any one of claims 1 to 9. The power source includes a photovoltaic power generation device.
The energy management system according to any one of claims 1 to 10. The first power threshold is the UPR set value.
The energy management system according to any one of claims 1 to 11. It is connected to the power system and load via the AC power line, connected to the power supply via the DC power line, stores the first power threshold, and the power supplied from the power system to the load is equal to or higher than the first power threshold. In some cases, the power conversion device that converts the DC power from the DC power line into AC power and outputs it to the AC power line is connected to the power conversion device via a communication path and measured on the DC power line and the AC power line. With the communication unit that receives the measured measurement information
Based on the information on the reverse power flow included in the measurement information, it is determined whether or not the change condition that there is no reverse power flow is satisfied, and when it is determined that the measurement information satisfies the change condition, the first power threshold value. And a calculation unit that generates control information instructing to reduce
With
The communication unit transmits the control information to the power conversion device, and the communication unit transmits the control information to the power conversion device.
The first power threshold stored in the power converter is changed according to the control information.
Power conversion control device. It is connected to the power system and load via the AC power line, connected to the power supply via the DC power line, stores the first power threshold, and the power supplied from the power system to the load is equal to or higher than the first power threshold. In some cases, with respect to the power conversion device that converts the DC power from the DC power line into AC power and outputs it to the AC power line, the measurement information measured in the DC power line and the AC power line is received, and the measurement information is received.
Based on the information on the reverse power flow included in the measurement information, it is determined whether or not the change condition that there is no reverse power flow is satisfied.
When it is determined that the measurement information satisfies the change condition, control information instructing to reduce the first power threshold value is generated.
A power conversion control method comprising changing a first power threshold value stored in the power conversion device according to the control information.

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