JP7120853B2 - Power supply system and power supply method - Google Patents

Description

TECHNICAL FIELD The present invention generally relates to charge/discharge control of a power storage device, and more particularly to control of a power storage device as a substitute for a substation that supplies power to a feeder line in the event of a power system abnormality such as a power failure or substation abnormality. .

Due to the seriousness of environmental problems and energy problems in recent years, a technology for realizing energy saving has been emphasized. In the field of railways, effective utilization of regenerative electric power generated during braking is attracting attention as one of the measures to reduce the energy required for vehicle operation. Regenerative power is power generated when braking force is obtained from the electromotive force of a motor mounted on the vehicle. A vehicle that supplies regenerative power is called a regenerative vehicle. The kinetic energy of the vehicle, which was wasted as heat in conventional friction brakes, can be used by converting it into electric power. The method of utilizing regenerative power differs depending on the power mode, such as non-electrification, DC electrification, and AC electrification, but in the following explanation, DC electrification will be taken as an example.

In a DC electrification feeder system, AC power received from the power system is converted to DC by a diode rectifier, and the power is supplied to the feeder line. do. The regenerated electric power is supplied from the vehicle to the feeder line, and can be utilized by being consumed by other vehicles in power running (power running vehicles). However, when there is no powering vehicle, there is no supply destination for the regenerative power, and it cannot be used effectively. The electric power consumed by the power running vehicle is called power running power.

In response to such problems, ground-mounted regenerative power storage devices (hereinafter referred to as power storage devices) that enable effective use of regenerative power even when there is no vehicle under power are attracting attention. A power storage device is a device that is connected to a feeder line, charges regenerated power, and discharges the charged power when power running power is generated. Electricity storage systems are also expected to be used as a substitute for substations that supply power to feeder lines in the event of a power system abnormality such as a blackout or substation abnormality, and to utilize the stored power for emergency train operation. be.

A conventional power storage device controls charge/discharge by utilizing the behavior of the feeder line voltage that varies depending on the load generated on the feeder line.

When there is no vehicle and no load on the feeder, or when the regenerated power and the power consumed by the motoring vehicle are equal, the current output by the rectifier is zero and the voltage on the feeder is the no-load voltage in the no-load condition. voltage.

When the regenerative power is lower than the power consumed by the motor vehicle, the output current of the rectifier is supplied from the power system to the feeder line, and the feeder line voltage is proportional to the output current of the rectifier due to the internal resistance of the rectifier. Lower than the no-load voltage.

If the regenerative power exceeds the power consumed by the motor vehicle, no current flows from the feeder to the power system, so the output current of the rectifier is zero, but there may be a power supply source on the feeder. The line voltage rises above the no-load voltage.

Therefore, when the feeder voltage exceeds a predetermined value (charge voltage) higher than the design value of the no-load voltage, it is charged, and when it falls below a predetermined value (discharge voltage) lower than the design value of the no-load voltage, it is discharged. Japanese Patent Laid-Open No. 2002-200000 discloses a technique for effectively utilizing electric power. Patent Document 1 states, "A power storage type regenerative power absorption device according to the present invention includes a power storage device and a power converter that controls discharge from the power storage device to a feeder line and charging from the feeder line to the power storage device. and a voltage control system during charging that controls the power converter so that when the feeder line voltage Vs is higher than the power charge operation start voltage Vabs, it is lowered to the power charge operation start voltage Vabs; a discharge time voltage control system for controlling the power converter to raise it to the power discharge operation start voltage Vdisc when it is lower than the operation start voltage Vdisc; a charging rate control system for controlling the power converter so that the charging rate SOC of the power storage device matches the charging rate command value SOCref when the starting voltage Vdisc or higher; and the power discharge operation start voltage Vdisc or higher, and further, when the absolute value of the deviation between the charging rate SOC of the power storage device and the charging rate command value SOCref is within a reference value ΔSOC, a suppress control system for stopping switching of the power converter. and have.”

Japanese Patent Application Laid-Open No. 2006-62489

When the main purpose is to save energy by effectively utilizing regenerative power, the charging rate of the power storage device is suppressed below a certain level so that the regenerative power can be charged.

However, when trying to use the energy storage system as an alternative power supply source in the event of a power system abnormality, if the charging rate of the energy storage system is suppressed, the amount of power required for emergency running of the train will be reduced to the energy storage system. cannot be compensated for, resulting in an incomplete emergency run of the train (for example, the train is left behind between stations until the power failure is restored).

In order to prevent this, it is conceivable to adopt a first method of increasing the charging rate of the power storage device or a second method of increasing the capacity of the power storage device.

However, with the first method, there is a possibility that the power storage device will run out of room to charge the regenerated power. The second method can increase the installation cost of the power storage device.

In order to solve the above-described problems, the present invention provides a power supply system configured by a power storage device and a power conversion device that controls the power storage device, wherein the power conversion device is a feeding power supply within the power supply range of the power storage device. The charge/discharge of the power storage device is controlled based on the amount of power required for emergency running of one or more trains running within the range receiving power supply from the feeder line.

With this invention, after suppressing the capacity of the power storage device, it is possible to save energy by effectively utilizing regenerative power in normal times, and to compensate for the amount of power required for emergency driving as a substitute for a substation in the event of a power system abnormality. becomes possible.

1 is a schematic diagram of a railway system including a power supply system in an embodiment; FIG. The figure which shows the structural example of the power converter device in an Example. The figure which shows the processing flow of the charging/discharging index determination part in an Example. The figure which shows the processing flow of the charging/discharging determination part in an Example.

In the following description, "storage unit" includes one or more memories. At least one memory in the storage unit may be a volatile memory or a non-volatile memory.

Also, in the following description, a "processor unit" is one or more processors. The at least one processor is typically a microprocessor such as a CPU (Central Processing Unit), but may be another type of processor such as a GPU (Graphics Processing Unit). At least one processor may be a broadly defined processor such as a hardware circuit (for example, FPGA (Field-Programmable Gate Array) or ASIC (Application Specific Integrated Circuit)) that performs part or all of the processing.

In addition, in the following description, the function may be described using the expression "kkk unit" (excluding the storage unit and the processor unit). It may be implemented by one or more hardware circuits. The description of each function is an example, and multiple functions may be combined into one function, or one function may be divided into multiple functions.

Also, in the following description, a "train" is composed of one or more train cars (hereinafter referred to as "vehicles").

FIG. 1 shows an overview of a railway system including a power supply system 100 in one embodiment of the invention.

The substation 102 receives power from the power system and supplies the power to the train 105 located within a predetermined range via the feeder line 101 . The power supply system 100 may be called a regenerative power storage device or a battery post. The power supply system 100 includes a power conversion device 103 that transfers power to and from a feeder line 101, and a power storage device 104 that charges and discharges through the power conversion device 103 under the control of the power conversion device 103. Configured. Also, there is a train 105 which receives power supply from the feeder 101 and runs.

A feeding range Lx, which is the power supply range of the power storage device 104 (for example, the farthest position Sa on one side and the farthest position Sb on the other side to which the power storage device 104 can supply power) is defined.

The power conversion device 103 charges and discharges the power storage device 104 based on the emergency power amount Pe required for emergency running of one or more trains 105 running within the feeder range Lx receiving power supply from the feeder line 101. periodically or aperiodically. As a result, the capacity of the power storage device 104 can be suppressed, and during normal times, energy can be saved by effectively using regenerated power, and in the event of a power system abnormality, the amount of power required for emergency running can be compensated as an alternative to the substation 102. It becomes possible to In each charging/discharging control process, the emergency power amount Pe is determined based on one or more required charging amounts Pq corresponding to one or more trains 105 within the feeding range Lx (for example, sum of 1 or more required charge amounts Pq). As a result, it can be expected that the emergency power amount Pe will be set to an appropriate value. For each of the one or more trains 105, the required charge amount Pq corresponding to the train 105 is the amount of electric power required for the train 105 to run in an emergency.

The power conversion device 103 controls charging and discharging of the power storage device 104 based on the current charge amount Pc of the power storage device 104 in addition to the emergency power amount Pe.

The current charge amount Pc represents the charge amount currently stored by the power storage device 104 . The current charge amount Pc may be the amount of charge for one power storage device 104, or the amount of charge of other power storage devices 104 installed nearby may be summed up and treated as if it were one power storage device 104. may

The emergency power amount Pe is the amount of charge required for emergency running of the train 105 traveling within the feeding range Lx. When a plurality of trains 105 run within the feeding range Lx, the emergency power amount Pe may be the sum of a plurality of required charging amounts Pq corresponding to the plurality of trains 105, respectively, as described above. In order to improve the adequacy of the emergency power amount Pe, in each charge/discharge control process, the emergency power amount Pe is set based on the number of trains 105 existing within the feeding range Lx with respect to the charge/discharge control process. It is the determined amount of power. In order to further improve the appropriateness of the emergency power amount Pe, in each charge/discharge control process, the emergency power amount Pe is further reduced to the power consumption of each train 105 existing within the feeding range Lx with respect to the charge/discharge control process. The power amount determined based on the travel position may be used. In order to further improve the adequacy of the emergency power amount Pe, in each charge/discharge control process, the emergency power amount further includes at least one of the following:
・Emergency stop position of each train 105 within the feeding range Lx,
Vehicle performance of each train 105 within the feeding range Lx (for example, at least one of vehicle weight, motor efficiency, and whether or not the vehicle is equipped with a storage battery);
・Congestion (e.g. passenger weight),
・ Planned run curve during emergency running (for example, target running speed at each running point),
- Route alignment in feeding range Lx (for example, at least one of slope, curve radius, running resistance, station platform position, and tunnel position at each running point), and
at least one transmission load (eg electrical resistance) of feeder 101 and rail in feeder range Lx
may be the amount of power determined based on

The emergency power amount Pe may be calculated by the power conversion device 103 or may be calculated by an external system (for example, an operation management device) of the power supply system 100 . For each train 105, the required charging amount Pq of the train 105 may be calculated by the on-board control device mounted on the train 105 and notified to the power conversion device 103 or the external system, or may be installed on the ground. Alternatively, a predetermined device may calculate and notify the power conversion device 103 or the external system. That is, in the present invention, the subject that calculates the emergency power amount Pe (and the required charging amount Pq of each train 105) may not be particularly restricted.

Further, the emergency electric energy Pe may be based on the position of each train 105 at which it stops in an emergency (for example, the platform of the next station), in addition to the running position of each train 105, as described above. For example, the required charge amount Pq for each train may be based on the distance from the running position of the train 105 to the stop position in an emergency.

The running position of each train 105 can be used to determine whether or not the train 105 is present within the feeding range Lx and to determine a more appropriate emergency power amount Pe. The running position of each train 105 may be detected by each train 105 and notified to the power converter 103 or the external system, or may be specified from the track circuit.

In addition, when the actual running position of each train 105 is not directly available (or regardless of whether or not it is), the running position of each train 105 within the feeding range Lx is one or more. A running position estimated based on the timetable for each of the trains 105 may be used. For example, based on the timetable information (information indicating the planned timetable of each train 105), the power conversion device 103 (or the external system) estimates the running position of each train 105 in each time period, and estimates the estimated position to the emergency stop position, the emergency power consumption Pe may be roughly calculated. When the emergency power amount Pe is calculated based on the timetable information, the change in the emergency power amount Pe can be predicted in advance. It is also possible to Therefore, there are advantages such as omission of communication processing regarding the train running position and simplification of the calculation load of the emergency power amount Pe. In addition, in a situation where the emergency power amount Pe fluctuates significantly in a short period of time, if rapid charging and discharging of the power storage device 104 is difficult, the charging and discharging operation is performed ahead of the actual fluctuation timing based on prediction. It is possible to start. In addition, while each train 105 is running according to the schedule, it is controlled by a preset charging and discharging operation, and when running different from the schedule (for example, temporary increase in number of trains, operation delay, etc.), it is different from the schedule. By notifying the power conversion device 103 (or the above external system) of information on operation (for example, vehicle information, delay time, actual timetable, etc.), the power conversion device 103 (or the above external system) is an unplanned train It can also be used for operation.

Further, in each charging/discharging control process, the feeding range may be the feeding range after being adjusted with the feeding range of at least one other adjacent power supply system. Specifically, for example, in an environment where a plurality of power supply systems 100 exist within a railway line (for example, between stations), a power supply range in which power can be efficiently supplied is specified for each power supply system 100, The emergency power amount Pe may be determined based on the power amount Pq required by the train 105 within the range in an emergency. More specifically, for example, when the power supply systems 100 are installed every 10 km, it is conceivable that 5 km before and after the installation position of each power supply system 100 is the feeding range Lx of each power supply system 100. . The feeding range of each power supply system 100 may be fixed based on the installation position of the power supply system 100, or may be set according to the operation status of each power supply system 100 or adjacent power supply systems 100 and the running status of the train 105. The power range may be changed dynamically. An example of the latter is as follows. That is, in each charge/discharge control process, when the current charge amount Pc of the power storage device 104 is less than the emergency power amount Pe, or the number of trains 105 running within the feeding range before being adjusted exceeds a threshold according to the emergency power amount Pe (for example, a threshold value that decreases as the emergency power amount Pe decreases), the adjusted feeding range (dynamically changed power power range) may be a shortened feeding range due to an extended feeding range for at least one other power supply system 100 . Specifically, for example, the current charge amount Pc of the power storage device 104 of a certain power converter 103 is less than the emergency power amount Pe allocated to the power converter 103, and the adjacent power converter 103 When the power storage device 104 has a sufficient current charge amount Pc (at least the current charge amount P greater than the emergency power amount Pe of the adjacent power converter 103), the adjacent power supply system 100 An operation that extends the power range and shortens the feeding range of the power supply system 100 itself can be considered. Further, for example, when a large number of trains 105 are running within the feeding range of a certain power supply system 100, the demand for the emergency power amount Pe for the power conversion device 103 is concentrated, so the adjacent power supply system 100 By extending the feeding range of the power storage device 104, it is possible to reduce the amount of power to be charged by the specific power storage device 104. FIG. For each of the plurality of power supply systems 100, as a method of adjusting (setting) the feeding range between the power supply system 100 and the adjacent power supply system 100, the power supply systems 100 communicate with each other and the feeding range or a method of adjustment by a remote monitoring and control device (or a device having similar functions) that monitors and controls various electric power facilities. When performing charge/discharge control based on the feeding range, a configuration may be adopted in which the running position of the train 105 is transmitted from an external system (for example, an operation management device) to the power supply system 100 .

A configuration example of the power converter 103 will be described with reference to FIG. In FIG. 2, the units of various power amounts Pm, Pn, Pe, Pc and Pt are, for example, Wh (watt hour), and the units of various voltages (and voltage thresholds) Vc, Vsc and Vsd are, for example, V ( bolt).

The power conversion device 103 includes a data source 201 which is a source of information indicating the maximum charge capacity Pm, the steady-state charge amount Pn, the feeder line voltage Vc, and the charge reference value ΔP of the power storage device 104, and the power charge determination index, which is a charge determination index. A charge/discharge index determination unit 202 that determines the operation start voltage (hereinafter referred to as charge threshold) Vsc, the power discharge operation start voltage (hereinafter referred to as discharge threshold) Vsd, and the target charge amount Pt, and the charge/discharge command S for the power storage device 104 are determined. and a power conversion operation unit 204 that determines the operation of the power conversion device 103 based on the charge/discharge command S.

The normal state charge amount Pn is the charge amount in a normal state (for example, other than in an emergency), specifically, for example, the optimum charge amount when the power storage device 104 is used mainly for energy saving. The normal charging amount Pn may be, for example, a charging amount for securing a margin for charging the regenerative power (for example, 40% of the maximum charging capacity Pm).

The maximum charge capacity Pm is the maximum charge amount that the power storage device 104 can be charged. The maximum charge capacity Pm may be the maximum amount of power that can be charged by the power storage device 104 as a device, or the maximum amount of power that is used for operation. For example, if the operating efficiency of the device decreases when the power storage device is charged to a 100% charge rate, the maximum power amount Pm may be the power amount at a charge rate of about 90%.

The charge reference value ΔP is used as an index for the charge/discharge index determination unit to determine whether the current charge amount Pc is sufficiently close to the target charge amount Pt, and is a value equal to or greater than zero (the current charge amount Pc and the target charge amount Pt If the difference in the charge amount Pt is equal to or less than ΔP, it is determined that the target charge amount is reached).

The data source 201 may be part of the storage unit of the power conversion device 103, or may be a communication interface that communicates with an external device. Data source 201 inputs information representing maximum charge capacity Pm, steady state charge amount Pn, and charge reference value ΔP of power storage device 104 to charge/discharge determination unit 203 . Also, the data source 201 may be information such as a database (for example, timetable information). Information representing the feeding range Lx may also be input from the data source 201 .

When the feeder line voltage Vc is higher than the charge threshold Vsc, the charge/discharge determination unit 203 controls the power converter 103 so as to lower the feeder line voltage Vc to the charge threshold Vsc. A charge/discharge command S for charging is output to the power conversion operation unit 204 . Further, when the feeder line voltage Vc is lower than the discharge threshold Vsd, the charge/discharge determination unit 203 controls the power converter 103 so as to raise the feeder line voltage Vc to the discharge threshold Vsd. to the power conversion operation unit 204.

When (the set value of) the charging threshold Vsc is lowered, charging from the feeder 101 to the power storage device 104 is facilitated. For example, if the charging threshold Vsc is set to the no-load voltage or less, the power storage device 104 can be easily charged by the above control even in a situation where regenerative power is not generated. Conversely, when (the set value of) the discharge threshold Vsd is increased, discharging from the power storage device 104 to the feeder line 101 is facilitated. For example, if the discharge threshold Vsd is equal to or higher than the no-load voltage, the electric power storage device 104 may be discharged by the control described above even when regenerative electric power is being generated. By using this characteristic, when the current charge amount Pc of the power storage device 104 is less than the target charge amount Pt, the charging threshold Vsc and the discharging threshold Vsd are lowered to promote charging and prevent over-discharging. can be suppressed. Conversely, when the current charge amount Pc of the power storage device 104 is equal to or greater than the target charge amount Pt, the charge threshold Vsc and the discharge threshold Vsd are increased to promote discharge and suppress overcharge. becomes possible.

A processing flow of charge/discharge control processing that is performed periodically (or aperiodically) will be described below. In this embodiment, the charge/discharge control process includes a process A performed by the charge/discharge index determination unit 202 and a process B performed by the charge/discharge determination unit 203 . In at least one charge/discharge control process, the process B may be performed after the process A is performed one or more times. At that time, each of the charge threshold Vsc and the discharge threshold Vsd as a result of the process A used in the process B is a value (for example, average value) and a value based on one or more discharge thresholds Vsd (eg, an average value).

Processing of the charge/discharge index determination unit 202 will be described with reference to FIG. The processing of FIG. 3 is performed periodically (for example, at intervals of 5 seconds).

First, the charge/discharge index determination unit 202 obtains the information of the maximum charge capacity Pm, the normal state charge amount Pn, and the charge reference value ΔP from the data source 201, and the information of the emergency power amount Pe (and the feeding range Lx), for example, From the data source 201, information on the current charge amount Pc is input from the power storage device 104 (step 1010).

Next, the charge/discharge index determination unit 202 determines whether or not the emergency power amount Pe is greater than the maximum charge capacity Pm (Pm<Pe) (step 1020).

If Pm<Pe (step 1020: Yes), the charge/discharge index determination unit 202 sets the numerical value of the maximum charge capacity Pm as the target charge amount Pt (step 1030).

If Pm≧Pe (step 1020: No), the charge/discharge index determination unit 202 determines whether or not the emergency power amount Pe is greater than the steady state charge amount Pn (Pn<Pe) (step 1040).

If Pn<Pe (step 1040: Yes), the charge/discharge index determination unit 202 sets the numerical value of the emergency power amount Pe as the target charge amount Pt (step 1050).

If Pn≧Pe (step 1040: No), the charge/discharge index determining unit 202 sets the numerical value of the steady state charge amount Pn as the target charge amount Pt (step 1060).

Next, the charge/discharge index determination unit 202 determines whether or not the current charge amount Pc is greater than the sum of the target charge amount Pt set above and the charge reference value ΔP (Pt+ΔP<Pc).

If Pt+ΔP<Pc (step 1070: Yes), charge/discharge index determination unit 202 determines overcharge. The set value is raised (for example, higher than the normal time) (step 1080).

If Pt+ΔP≧Pc (step 1070: No), the charge/discharge index determination unit 202 determines whether the current charge amount Pc is greater than the value obtained by subtracting the charge reference value ΔP from the target charge amount Pt (Pt−ΔP<Pc). is determined (step 1090).

If Pt−ΔP<Pc (step 1090: Yes), the charge/discharge index determination unit 202 determines that the current charge amount Pc is within the allowable range. The set value of Vsd is maintained (for example, set to steady state) (step 1100).

If Pt−ΔP≧Pc (step 1090: No), charge/discharge index determining unit 202 determines over-discharge or insufficient charge. And the set value of the discharge threshold Vsd is further lowered (for example, lower than the normal time) (step 1110).

Finally, charge/discharge index determination unit 202 transmits the charge threshold Vsc and discharge threshold Vsd set above to charge/discharge determination unit 203 (step 1120).

In the process of FIG. 3, Pt=Pm (step 1030) means that even if the power storage device 104 is charged to the maximum charge amount Pm, the emergency power amount Pe is not reached. As a countermeasure in this case, for example, by adjusting the sharing of the power range between the adjacent power supply systems 100 on both sides or one side (specifically, by shortening the feeding range Lx of the own power supply system 100). By extending the feeding range of the adjacent power supply system 100), it is conceivable to suppress the emergency power amount Pe allocated to its own power converter 103 .

Further, for example, the power conversion device 103 notifies the operation control room, the operation management device, and the train centralized control device of the occurrence of this situation, and the schedule and run curve of the train 105 running near the installation position of the power conversion device 103. It is conceivable to minimize the impact of power outages by encouraging changes. Specifically, in each charge/discharge control process, if the current charge amount Pc of the power storage device 104 is less than the emergency power amount Pe, the power conversion device 103 controls one or more charge within the feeding range Lx. Processing related to changing at least one diagram or run curve of the train (for example, changing the diagram or run curve, or requesting an external system such as an operation control device to change the diagram or run curve), or Executes processing (for example, notifying the alarm or requesting the external system to notify the alarm) to each driver of one or more trains.

In steps 1080 and 1110 described above, the charge/discharge index determination unit 202 increases or decreases the charge threshold Vsc and the discharge threshold Vsd according to the comparison result between the current charge amount Pc and the target charge amount Pt. The charging/discharging index determination unit 202 periodically executes the processing of FIG. You can leave it. If the set value increases or decreases each time it is executed, upper limit values or lower limit values may be set in advance for the set values of the charge threshold value Vsc and the discharge threshold value Vsd. In addition, for the set values of the charge threshold Vsc and the discharge threshold Vsd, a plurality of patterns of set values to be used may be determined in advance, and used according to the difference between the current charge amount Pc and the target charge amount Pt. For example, when the difference between the current charge amount Pc and the target charge amount Pt is small (for example, less than a certain value), the charge/discharge index determination unit 202 sets the charge threshold Vsc and the discharge threshold Vsd to values smaller than the current values. may be Further, for example, when the difference between the current charge amount Pc and the target charge amount Pt is large (for example, equal to or greater than the above constant value), the charge/discharge index determination unit 202 changes the setting values of the charge threshold Vsc and the discharge threshold Vsd to the current values. A larger value may be used. Moreover, although both the charge threshold Vsc and the discharge threshold Vsd are changed in the above description, only one of them may be changed.

The above is the processing procedure of the charge/discharge index determination unit 202 assuming that the power system is normal, but different processing may be performed when the power system is abnormal. For example, when charging/discharging index determination unit 202 detects a power system abnormality, at least one of steps 1080, 1100, and 1100 sets at least one set value of charging threshold Vsc and discharging threshold Vsd to You can change the setting value for In this case, as a method of keeping the feeder line voltage Vc lower than that during normal operation, for example, setting the discharge threshold Vsd lower than during normal operation is conceivable.

Next, the operation of charge/discharge determination section 203 will be described with reference to FIG. The processing of FIG. 4 is performed periodically (for example, at intervals of 5 seconds).

First, the charge/discharge determination unit 203 receives information on the maximum charge capacity Pm and the feeder voltage Vc from the data source 201, information on the current charge amount Pc from the power storage device 104, and information on the charge threshold Vsc and the discharge threshold Vsd. Input from the discharge index determining unit 202 (step 2010).

Next, the charge/discharge determination unit 203 determines whether or not the feeder line voltage Vc is smaller than the discharge threshold Vsd (Vc<Vsd) (step 2020).

If Vc<Vsd (step 2020: Yes), the charge/discharge determination unit 203 transmits a charge/discharge command S indicating the start of discharge to the power conversion operation unit 204 (step 2030).

If Vc≧Vsd (step 2020: No), the charge/discharge determination unit 203 determines whether or not the feeder line voltage Vc is greater than the charge threshold Vsc (Vsc<Vc) (step 2040). If Vsc<Vc (step 2040: Yes), the charge/discharge determination unit 203 determines whether or not the current charge amount Pc is smaller than the maximum charge capacity Pm (Pc<Pm) (step 2050).

If Vsc<Vc and Pc<Pm (step 2050: Yes), the charge/discharge determination unit 203 transmits a charge/discharge command S indicating the start of charging to the power conversion operation unit 204 (step 2060).

If Vsc≧Vc or Pc≧Pm (step 2040: No or step 2050: No), the charge/discharge determination unit 203 sends a charge/discharge command to the power conversion operation unit 204 to stop charging/discharging. S is sent (step 2070).

According to the above embodiment, the current power amount Pc of the power storage device 104 controlled by the power conversion device 103 is the emergency power amount required for each train 105 to run in an emergency when the train 105 has an abnormality in the power system. The power conversion device 103 sets the target charge amount Pt and the power charge/discharge start voltages (Vsc, Vsd) that promote charging of the power storage device 104 and suppress discharge so that Pe can be secured. . In addition, when the emergency power amount Pe is small, the target charging amount is such that discharging to the power storage device 104 is promoted and charging is suppressed so that there is room to absorb the regenerated power from the train 105. The power conversion device 103 sets Pt and power charge/discharge start voltages (Vsc, Vsd). In this way, by controlling the charging amount of the power storage device 104 according to the running condition of the train 105, the capacity of the power storage device 104 can be suppressed, and in normal times, energy can be saved by effectively using the regenerated power. At the same time, it is possible to provide the power storage device 104 that compensates for the amount of power required for emergency running of the train as a substitute for the substation 102 in the event of an abnormality in the power system.

In addition, according to the embodiment, the amount of emergency electric power increases during a time zone (overcrowded operation) when many trains 105 run in the vicinity, and there is a possibility that the amount of electric power that can be regenerated and absorbed by the electric power storage device 104 is limited. However, in the case of overcrowded operation, trains can exchange power for running and regenerative power, so even if the amount of charge in the power storage device 104 is increased during overcrowded operation, it is assumed that the impact on energy saving is small. be.

Although specific examples have been described above, these are examples for explaining the present invention, and are not meant to limit the scope of the present invention only to the above examples. The invention can also be implemented in various other forms. For example, the processing of FIGS. 3 and 4 can be summarized as follows.

That is, in each charge/discharge control process, the power conversion device 103 charges based on the magnitude relationship between at least one of the charge threshold Vsc and the discharge threshold Vsd of the power storage device 104 and the current charge amount Pc of the power storage device 104. Control discharge. The charge threshold Vsc is a threshold that is compared with the current charge amount Pc of the power storage device 104 and is a threshold for determining whether to start charging the power storage device 104 . The discharge threshold Vsc is a threshold that is compared with the current charge amount Pc of the power storage device 104 and is a threshold for determining whether or not to start discharging the power storage device 104 . In each charge/discharge control process, at least one of the charge threshold Vsc and the discharge threshold Vsd is a value determined based on the magnitude relationship between the target charge amount Pt and the current charge amount Pc in the process. In each charging/discharging control process, the target charging amount Pt is determined based on the magnitude relationship between the emergency power amount Pe and at least one of the maximum charging capacity Pm of the power storage device 104 and the normal charging amount Pn. quantity.

Specifically, the following can be said about each charging/discharging control process. That is, when the emergency power amount Pe is larger than the maximum charge capacity Pm, the target charge amount Pt is the maximum charge capacity Pm. When the emergency power amount Pe is equal to or less than the maximum charge capacity Pm and larger than the steady-state charge amount Pn, the target charge amount Pt is the emergency power amount Pe. When the current charge amount Pc is greater than the sum of the target charge amount Pt and a predetermined value (for example, charge reference value ΔP), each of the charge threshold Vsc and the discharge threshold Vsd is set to a higher value. When the current charge amount Pc is equal to or less than the difference between the target charge amount Pt and the predetermined value, each of the charge threshold Vsc and the discharge threshold Vsd is set to a lower value.

100: power supply system 103: power conversion device 104: power storage device

Claims (12)

In a power supply system configured by a power storage device and a power conversion device that controls the power storage device and supplying power to a feeder line,
The power conversion device calculates the amount of emergency power required for emergency running of one or more trains that run within the feeder range, which is the power supply range of the power storage device, by receiving power from the feeder line. periodically or aperiodically executing charge/discharge control processing for controlling charge/discharge of the power storage device ;
In each charge/discharge control process, the feeding range is a feeding range after being adjusted with the feeding range of at least one other adjacent power supply system,
In each charge/discharge control process, if the current charge amount of the power storage device is less than the emergency power amount, or if the number of trains running within the feeding range before adjustment is If the threshold according to the emergency power amount is exceeded, the adjusted feeding range is a shortened feeding range due to the extension of the feeding range for the at least one other power supply system. be,
A power supply system characterized by: In the power supply system according to claim 1,
In each charge/discharge control process, the emergency power amount is an amount of power determined based on the number of trains existing within the feeding range with respect to the charge/discharge control process. system. In the power supply system according to claim 2,
In each charging/discharging control process, the emergency power amount is further determined based on the running position of each train existing within the feeding range with respect to the charging/discharging control process. power supply system. In the power supply system according to claim 3,
In each charge/discharge control process, the emergency power amount further includes at least one of the following:
emergency stop position of each train;
vehicle performance of each train;
the degree of congestion of each train;
Run curve for emergency driving,
Route alignment in the feeding range, and
A power supply system, wherein the amount of power is determined based on the transmission load of at least one of feeders and rails in the feeder range. In the power supply system according to any one of claims 1 to 4,
The power supply system, wherein the running position of each train within the feed range is a running position estimated based on the timetable for each of the one or more trains. In the power supply system according to any one of claims 1 to 5 ,
In each charge/discharge control process, if the current charge amount of the power storage device is less than the emergency power amount, the power converter changes at least one timetable or run curve of the one or more trains. A power supply system characterized by executing a process related to notification of an alarm to a dispatcher or a driver of each of the one or more trains. In the power supply system according to any one of claims 1 to 6 ,
The power conversion device changes at least one of a charging threshold and a discharging threshold of the power storage device when an abnormality in the power system is detected,
The charge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether to start charging the power storage device;
The power supply system, wherein the discharge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether or not to start discharging the power storage device. . In the power supply system according to any one of claims 1 to 7 ,
In each charge/discharge control process, the emergency power amount is a power amount determined based on one or more required charging amounts corresponding to the one or more trains, respectively,
A power supply system, wherein, for each of the one or more trains, the required charging amount corresponding to the train is the amount of power required for emergency running for the train. In a power supply system configured by a power storage device and a power conversion device that controls the power storage device and supplying power to a feeder line,
The power conversion device calculates the amount of emergency power required for emergency running of one or more trains that run within the feeder range, which is the power supply range of the power storage device, by receiving power from the feeder line. periodically or aperiodically executing charge/discharge control processing for controlling charge/discharge of the power storage device;
In each charge/discharge control process, the power conversion device controls charge/discharge based on a magnitude relationship between at least one of a charge threshold value and a discharge threshold value of the power storage device and a current charge amount of the power storage device,
The charge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether to start charging the power storage device;
The discharge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether to start discharging the power storage device;
In each charge/discharge control process, at least one of the charge threshold and the discharge threshold is a value determined based on the magnitude relationship between the target charge amount and the current charge amount in the process,
In each charge/discharge control process, the target charge amount is a charge amount determined based on a magnitude relationship between the emergency power amount and at least one of the maximum charge capacity and the normal charge amount of the power storage device. A power supply system characterized by: In the power supply system according to claim 9 ,
In each charge/discharge control process,
when the emergency power amount is greater than the maximum charging capacity, the target charging amount is the maximum charging capacity;
when the emergency power amount is equal to or less than the maximum charge capacity and greater than the steady state charge amount, the target charge amount is the emergency power amount;
each of the charge threshold and the discharge threshold is a higher value when the current charge amount is greater than the sum of the target charge amount and a predetermined value;
The power supply system, wherein each of the charge threshold and the discharge threshold is a lower value when the current charge amount is equal to or less than the difference between the target charge amount and the predetermined value. In a power supply method capable of controlling charging and discharging of a power storage device and supplying power to a wire,
Charging and discharging of the power storage device based on the emergency power amount required for emergency running of one or more trains that run within the feeder range, which is the power supply range of the power storage device, receiving power from the feeder line. Periodically or aperiodically executes a charge/discharge control process that controls the
In each charge/discharge control process, the feeding range is a feeding range after being adjusted with the feeding range of at least one other adjacent power supply system,
In each charge/discharge control process, if the current charge amount of the power storage device is less than the emergency power amount, or if the number of trains running within the feeding range before adjustment is If the threshold according to the emergency power amount is exceeded, the adjusted feeding range is a shortened feeding range due to the extension of the feeding range for the at least one other power supply system. be,
A power supply method characterized by: In a power supply method capable of controlling charging and discharging of a power storage device and supplying power to a wire,
Charging and discharging of the power storage device based on the emergency power amount required for emergency running of one or more trains that run within the feeder range, which is the power supply range of the power storage device, receiving power from the feeder line. Periodically or aperiodically executes a charge/discharge control process that controls the
In each charging/discharging control process, charging/discharging is controlled based on a magnitude relationship between at least one of a charging threshold value and a discharging threshold value of the power storage device and a current charge amount of the power storage device,
The charge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether to start charging the power storage device;
The discharge threshold is a threshold to be compared with the current charge amount of the power storage device, and is a threshold for determining whether to start discharging the power storage device;
In each charge/discharge control process, at least one of the charge threshold and the discharge threshold is a value determined based on the magnitude relationship between the target charge amount and the current charge amount in the process,
In each charge/discharge control process, the target charge amount is a charge amount determined based on a magnitude relationship between the emergency power amount and at least one of the maximum charge capacity and the normal charge amount of the power storage device. is
A power supply method characterized by:

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