JP7262259B2 - Power supply device, capture voltage value determination device, and capture voltage value determination method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a power supply device, a captured voltage value determination device, and a captured voltage value determination method that utilize regenerative electric power of an electric car generated by an overhead wire.

2. Description of the Related Art Conventionally, a power supply device is known that has a function of taking in regenerative electric power generated by an electric train on an overhead wire. For example, in Patent Document 1, a reference charging voltage is calculated based on the current and voltage of a rectifier in a substation that supplies power to overhead lines, and when the voltage of the overhead lines exceeds the reference charging voltage, regenerative power of an electric train is calculated. is disclosed.

JP 2009-241677 A

However, since the overhead lines are connected to a plurality of substations, the technology described in Patent Document 1 is used to determine whether or not to take in the regenerative power of the electric train depending on the state of the plurality of substations. In some cases, it is not possible to accurately determine the captured voltage value.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply device capable of accurately determining a captured voltage value.

In order to solve the above-described problems and achieve the object, the power supply device of the present invention includes a no-load voltage value estimating unit, a captured voltage value determining unit, a voltage measuring unit, a command generating unit, and a power converting unit. Prepare. The no-load voltage value estimator calculates the no-load voltage of each of the plurality of substations based on the values of current and voltage output to the overhead line from each rectifier in each of the plurality of substations that supply power to the overhead line. Estimate a value. The input voltage value determination unit determines the highest no-load voltage value among the no- load voltage values, and based on the highest no-load voltage value, determines whether or not the regenerative power of the electric train is to be input from the overhead wire. Determine a certain acquisition voltage value. The voltage measurement unit measures an overhead wire voltage value, which is the voltage value of the overhead wire. The command generation unit generates a capture command requesting capture of the regenerated electric power of the overhead wire when the overhead wire voltage value measured by the voltage measurement unit is equal to or higher than the capture voltage value determined by the capture voltage value determination unit. The power converter converts the regenerated electric power of the overhead wire into electric power having a voltage lower than the voltage of the overhead wire when the command generator generates the take-in command.

ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to determine an acquisition voltage value accurately.

1 is a diagram showing a configuration example of a power system including a power supply device according to Embodiment 1 of the present invention; FIG. FIG. 4 is a diagram showing an example of the relationship between the output characteristics of the rectifier according to the first embodiment and the voltage on the power receiving side; 3 is a flowchart showing an example of adjustment value calculation processing in the power supply device according to the first embodiment; 3 is a flow chart showing an example of input voltage value determination processing in the power supply device according to the first embodiment; 4 is a flow chart showing an example of a capture determination process in the power supply device according to the first embodiment; FIG. 2 shows a hardware configuration of a processing unit of the power supply device according to the first embodiment;

DETAILED DESCRIPTION OF THE INVENTION A power supply device, a captured voltage value determining device, and a captured voltage value determining method according to embodiments of the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

Embodiment 1.
FIG. 1 is a diagram showing a configuration example of a power system including a power supply device according to Embodiment 1 of the present invention. The electric power system 100 according to the first embodiment includes a plurality of substations 4 _{1 ,} 4 ₂ , . 2, a power supply device 10 for converting the regenerated electric power of the electric car 1 generated in the electric car 1 into AC power and outputting it to the station building 7. In addition, the overhead line 2 includes a feeder line.

The electric car 1 generates regenerative electric power by using a motor as a generator, for example, when a deceleration operation is performed. . . , _4n may be referred to as a substation 4 hereinafter when each of the plurality of substations 4 ₁ , 4 ₂ , . . . Although n is an integer of 3 or more, the number of substations 4 may be two.

The substation 4 generates 1500V system DC voltage from the 6600V system AC voltage supplied from the high voltage distribution system 5 via the transmission line 6 , and outputs the generated 1500V system DC voltage to the overhead line 2 . The substation 4 includes a transformer 41 that steps down the AC voltage of the 6600V system supplied from the high voltage distribution system 5 and a rectifier 42 that rectifies the AC voltage stepped down by the transformer 41 . The output of the rectifier 42 is connected to the overhead wire 2, and the rectifier 42 outputs a DC voltage of 1500 V system.

The substation 4 also includes a voltage measuring unit 43 that measures the value of voltage output from the rectifier 42, a current measuring unit 44 that measures the value of current output from the rectifier 42, and the measurement results of the voltage measuring unit 43. and a substation device 45 that acquires the measurement result of the current measurement unit 44 .

The voltage measurement unit 43 outputs information on the output voltage value, which is the value of the voltage output from the rectifier 42 to the overhead line 2 , to the substation device 45 . The current measurement unit 44 outputs information on the output current value, which is the value of the current output from the rectifier 42 to the overhead line 2 , to the substation device 45 . The substation device 45 can calculate the no-load voltage value of the substation 4 based on the output voltage value and the output current value. The no-load voltage value is the value of the voltage output from the rectifier 42 to the overhead wire 2 at the substation 4 in a state where power is not being supplied to the electric car 1 via the overhead wire 2 .

The output characteristics of the rectifier 42 are uniquely determined by the characteristics of the transformer 41 and the rectifier 42 when the value of the receiving side voltage, which is the voltage received by the substation 4 from the high-voltage distribution system 5 via the transmission line 6, is constant. Determined. The value of the power receiving side voltage fluctuates, for example, due to voltage fluctuations in the high-voltage distribution system 5 and power consumption of consumers connected to the transmission line 6 . Therefore, by grasping in advance the output characteristics of the rectifier 42 for each value of the power receiving side voltage, the output measured by the voltage measurement unit 43 and the current measurement unit 44 while power is being supplied from the substation 4 to the overhead line 2 A no-load voltage value can be estimated from the voltage value and the output current value.

FIG. 2 is a diagram illustrating an example of the relationship between the output characteristics of the rectifier and the power receiving side voltage according to the first embodiment. The example shown in FIG. 2 is a diagram showing the relationship between the three power receiving side voltages Vr1, Vr2, Vr3 and the output characteristics of the rectifier 42. In FIG. When the output voltage value is "Vm1" and the output current value is "Im1", the power receiving side voltage value is "Vr1" and the no-load voltage value is "Vmo1".

When the output voltage value is "Vm2" and the output current value is "Im2", the power receiving side voltage is "Vr2" and the no-load voltage value is "Vmo2". Further, when the output voltage value is "Vm3" and the output current value is "Im3", the power receiving side voltage is "Vr3" and the no-load voltage value is "Vmo3". Note that the relationship between the output characteristics of the rectifier 42 and the power receiving side voltage shown in FIG. 2 is an example, and the relationship between the output characteristics of the rectifier 42 and the power receiving side voltage is not limited to the example shown in FIG.

The substation device 45 shown in FIG. 1 has, for example, information on the output characteristics of the rectifier 42 for each voltage on the receiving side. , the no-load voltage value of the substation 4 can be estimated. The substation device 45 may be configured to have information that associates a set of an output voltage value and an output current value with a no-load voltage value for each set of an output voltage value and an output current value. In this case, the substation device 45 converts the no-load voltage value associated with the set that matches the set of the output voltage value of the voltage measurement unit 43 and the output current value of the current measurement unit 44 to the no-load voltage value of the substation 4. can be estimated as a value.

The substation device 45 can transmit information on the estimated no-load voltage value to the power supply device 10 by wire or wirelessly via a network (not shown). Further, the substation device 45 may be configured not to estimate the no-load voltage value. In this case, substation device 45 can transmit measurement information including the output voltage value and the output current value measured by voltage measurement unit 43 and current measurement unit 44 to power supply device 10 .

The station building 7 includes a transformer 71 that converts the 6600V system AC voltage supplied from the high voltage distribution system 5 to a 210V system AC voltage, and a station load 72 . The station load 72 includes a plurality of electrical installations 73 ₁ , 73 ₂ , . . . , 73 _m . m is an integer of 3 or more. Each of the plurality of electrical equipment 73 ₁ , 73 _{2 ,} .

Based on the information output from the substation 4, the power supply device 10 determines the input voltage value Vth, which is the reference for capturing the regenerated power from the overhead line 2, and when the voltage of the overhead line 2 becomes equal to or higher than the input voltage value Vth, , the regenerative power generated in the overhead line 2 is converted into AC power and output to the station building 7 . As will be described later, the power supply device 10 can accurately determine the voltage value Vth to be taken in, thereby efficiently taking in the regenerated electric power generated in the overhead wire 2 .

Power supply device 10 includes communication unit 11 , power conversion unit 12 , voltage measurement unit 13 , and processing unit 14 . The communication unit 11 is connected to a network (not shown) by wire or wirelessly, and receives information output from each substation 4 via the network (not shown). The processing unit 14 is an example of a captured voltage value determination device.

The power conversion unit 12 converts the regenerated power generated in the overhead line 2 into 210V AC power and outputs the AC power to the station building 7 . The power conversion unit 12 has, for example, a plurality of bridge-connected switching elements and a drive unit that drives the plurality of switching elements, and is controlled by the processing unit 14 .

The voltage measurement unit 13 measures an overhead wire voltage value Vst, which is the voltage value of the overhead wire 2 . The station building 7 is arranged between the substation _4-1 and the substation _4-2 , and the voltage measuring unit 13 measures the voltage value of the measuring point P located inside or around the station building 7 on the overhead line 2. is measured as the overhead line voltage value Vst. The voltage measurement unit 13 outputs information on the measured overhead wire voltage value Vst to the processing unit 14 .

The processing unit 14 includes a no-load voltage value estimation unit 21 , a no-load voltage information acquisition unit 22 , an input voltage value determination unit 23 , and a command generation unit 24 . When the information acquired by the communication unit 11 is measurement information, the no-load voltage value estimating unit 21, based on the output voltage value and the output current value included in the measurement information, the substation device 45 of the substation 4 and A no-load voltage value of the substation 4 can be estimated by similar processing.

The no-load voltage information acquisition unit 22 acquires information on the no-load voltage value of the substation 4 from the communication unit 11 when the information acquired by the communication unit 11 is information on the no-load voltage value of the substation 4 . Further, when the information acquired by the communication unit 11 is the measurement information, the no-load voltage information acquisition unit 22 acquires the information of the no-load voltage value of the substation 4 estimated by the no-load voltage value estimation unit 21 as a no-load voltage value. Acquired from the voltage value estimation unit 21 . Hereinafter, the no-load voltage values of the substations 4 ₁ , 4 ₂ , . . _. , 4 _n may be referred to as no-load voltage values Vo ₁ , Vo ₂ , . Also, when the no-load voltage values Vo ₁ , _{Vo 2} , .

The input voltage value determination unit 23 _{selects the highest no-load voltage value Vo among the no-load voltage values Vo 1 , Vo 2 , .} is determined, and the fetched voltage value Vth is determined based on the highest no-load voltage value Vo. As described above, the input voltage value Vth is the threshold value of the voltage of the overhead wire 2 and is used to determine whether or not the power conversion unit 12 retrieves the regenerated electric power of the electric car 1 from the overhead wire 2 . Hereinafter, the substation 4 corresponding to the highest no-load _voltage value Vo among the no-load voltage values _Vo1 , _Vo2 , . When the highest no-load voltage value Vo is the no-load voltage value _Vo1 , the adjustment value calculation target is the substation _4-1 .

The input voltage value determination section 23 includes an adjustment value calculation section 31 and a determination section 32 . The adjustment value calculation unit 31 calculates the no-load voltage value Vo for adjustment value calculation based on the difference between the overhead wire voltage value Vst when the overhead wire 2 is in a no-load state and the no-load voltage value Vo for adjustment value calculation. An adjustment value Vadj is calculated. The period during which the overhead wire 2 is in a no-load state is, for example, the period from when power transmission from each substation 4 to the overhead wire 2 is started to when power supply from the overhead wire 2 to the electric car 1 is started. , may be described as overhead line no-load period.

The adjustment value calculator 31 obtains information about the no-load voltage value Vo of each substation 4 estimated based on the output voltage value and the output current value measured by the voltage measuring unit 43 and the current measuring unit 44 during the overhead line no-load period. is obtained from the no-load voltage information obtaining unit 22 . Further, the adjustment value calculation unit 31 acquires from the voltage measurement unit 13 information on the overhead wire voltage value Vst measured by the voltage measurement unit 13 during the overhead wire no-load period. Then, the input voltage value determination unit 23 calculates the adjustment value Vadj based on the acquired information on the no-load voltage value Vo of the substation 4 and information on the overhead line voltage value Vst.

For example, the adjustment value calculation unit 31 calculates the difference ΔVd between the no-load voltage value Vo for adjustment value calculation during the no-load period of the overhead wire and the voltage value Vst of the overhead wire during the no-load period of the overhead wire as the adjustment value Vadj. Such an adjustment value Vadj is set in the section up to the measurement point P when the voltage output from the substation 4 in the overhead line no-load period decreases due to some factor in the section up to the measurement point P and reaches the measurement point P. is the value of the voltage that is estimated to drop at Some factors include, for example, a voltage drop caused by a leakage current caused by an insulator connected to the overhead wire 2, or a voltage drop caused by a leakage current caused by a capacitive component between the overhead wire 2 and ground. Also, the adjustment value Vadj may include an estimation error of the no-load voltage value Vo.

For example, if the adjustment value is calculated for substation _4-1 , the no-load voltage value _Vo1 of substation _4-1 during the overhead wire no-load period is 1750 V, and the overhead wire voltage value Vst during the overhead wire no-load period is 1740 V. do. In this case, the adjustment value calculator 31 subtracts 1740V from 1750V to calculate the difference ΔVd “10V” as the adjustment value Vadj for the no-load voltage value _Vo1 of the substation _4-1 .

By the same processing, the adjustment value calculation unit 31 calculates the no-load voltage values Vo ₂ to Vo _n of the substations 4 ₂ to 4 _n when the substations 4 ₂ to 4 _n are the adjustment value calculation targets. It is possible to calculate an adjustment value Vadj for . Hereinafter, the adjustment values Vadj corresponding to the no-load voltage values Vo ₁ to Vo _n may be referred to as adjustment values Vadj ₁ to Vadj _n .

The adjustment value calculation unit 31 determines, for example, the substation 4 corresponding to the highest no-load voltage value Vo among the no-load voltage values Vo ₁ to Vo _n of the substations 4 ₁ to 4 _n at a preset cycle. , the adjustment value Vadj for the highest no-load voltage value Vo is calculated. The adjustment value calculation unit 31 determines that all of the no-load voltage values Vo ₁ to Vo _n of the substations 4 ₁ to 4 _n become the highest no-load voltage value Vo at one of a plurality of determination timings. , adjustment values Vadj ₁ to Vadj _n can be calculated.

In the above description, the period from the start of power transmission from each substation 4 to the overhead wire 2 to the start of power supply from the overhead wire 2 to the electric car 1 is defined as the overhead wire no-load period. The period is not limited to the period described above. For example, a preset period after power transmission from each substation 4 to the overhead line 2 is started may be set as the overhead line no-load period. The preset period is, for example, a period within several minutes.

The determination unit 32 determines in advance the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4, and determines the input voltage value Vth based on the highest no-load voltage value Vo. It is performed at the set cycle. The determination unit 32 outputs information on the determined take-in voltage value Vth to the command generation unit 24 .

For example, the determination unit 32 can take in a voltage value equal to or higher than the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4 and determine it as the voltage value Vth. For example, assume that the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4 is 1780V. In this case, the determining unit 32 can determine, for example, 1780V as the input voltage value Vth.

Further, when the highest no-load voltage value Vo is the no-load voltage value Vo for which the adjustment value Vadj is calculated by the adjustment value calculation unit 31, the determination unit 32 determines the highest no-load voltage value Vo and the adjustment value Vadj. , the captured voltage value Vth can be determined.

For example, assume that the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4 is the no-load voltage value _Vo1 of the substation _4-1 and is 1780V. Also assume that the adjustment value Vadj ₁ of the substation _4-1 is 10V. In this case, the determination unit 32 can determine a voltage value equal to or higher than "1770 V", which is the result of subtracting the adjustment value Vadj ₁ "10 V" from the no-load voltage value "1780 V", as the input voltage value Vth.

Note that, for example, the determination unit 32 determines the highest no-load voltage value only when the substation 4 corresponding to the highest no-load voltage value Vo is the substation 4 within a preset distance from the measurement point P A value obtained by subtracting the adjustment value Vadj from Vo can also be determined as the input voltage value Vth. In addition, for example, only when the substation 4 corresponding to the highest no-load voltage value Vo is a specific substation, the determination unit 32 acquires a value obtained by subtracting the adjustment value Vadj from the highest no-load voltage value Vo. It can also be determined as a voltage value Vth. The specific substations are, for example, substations 4 ₁ and 4 ₂ closest to the measurement point P on the upstream and downstream sides, respectively.

The command generation unit 24 compares the overhead wire voltage value Vst measured by the voltage measurement unit 13 with the input voltage value Vth determined by the input voltage value determination unit 23 . The command generation unit 24 outputs a capture command to the power conversion unit 12 when the overhead wire voltage value Vst is equal to or higher than the capture voltage value Vth. conduct.

The command generation unit 24 continues to output the capture command until the next capture voltage value Vth is determined by the capture voltage value determination unit 23 after starting to output the capture command. When the processing unit 14 starts outputting the take-in command, the power conversion unit 12 starts power conversion processing for converting the regenerated power generated in the overhead wire 2 into AC power and outputting the AC power to the station building 7 . The power conversion unit 12 continues power conversion processing until the command generation unit 24 no longer outputs the capture command, and stops the power conversion processing when the command generation unit 24 no longer outputs the capture command.

In the example described above, the input voltage value determination unit 23 determines the input voltage value Vth based on the no-load voltage value Vo and the adjustment value Vadj. Not limited. For example, the input voltage value determination unit 23 determines the no-load voltage value Vo It is also possible to calculate the no-load voltage value Vo'.

For example, the input voltage value determination unit 23 performs a process of subtracting a value obtained by multiplying the substation distance by a coefficient k from the no-load voltage value Vo for each no-load voltage value Vo of the substation 4, thereby correcting After that, the no-load voltage value Vo' of each substation 4 can be calculated. Also in this case, the input voltage value determining unit 23 can determine a voltage value equal to or higher than the highest no-load voltage value Vo' among the no-load voltage values Vo' of the plurality of substations 4 as the input voltage value Vth.

Next, the operation of the power supply device 10 will be explained using a flowchart. 3 is a flowchart illustrating an example of adjustment value calculation processing in the power supply device according to the first embodiment; FIG. Such adjustment value calculation processing is performed during the overhead wire no-load period described above.

As shown in FIG. 3, the input voltage value determination unit 23 of the processing unit 14 acquires information on the overhead wire voltage value Vst from the voltage measurement unit 13 (step S11). Further, the no-load voltage information acquisition unit 22 of the processing unit 14 acquires information on the no-load voltage value Vo of each substation 4 (step S12).

The processing unit 14 changes the no-load voltage value Vo of each substation 4 based on the information of the overhead line voltage value Vst acquired in step S11 and the information of the no-load voltage value Vo of each substation 4 acquired in step S12 A corresponding adjustment value Vadj is calculated (step S13), and the process shown in FIG. 3 is terminated.

FIG. 4 is a flowchart of an example of a voltage value determination process performed by the power supply device according to the first embodiment; Such a captured voltage value determination process is executed at a cycle preset by the processing unit 14 .

As shown in FIG. 4, the processing unit 14 acquires information from the substation 4 (step S21). The processing unit 14 determines whether or not the information acquired in step S21 is measurement information (step S22). When the processing unit 14 determines that the acquired information is the measurement information (step S22: Yes), it calculates the information of the no-load voltage value Vo of the substation 4 based on the measurement information (step S23).

When the processing of step S23 is finished, or when it is determined that the acquired information is not the measurement information (step S22: No), the processing unit 14 determines whether or not the information of all the substations 4 has been acquired. (Step S24). When the processing unit 14 determines that the information of all the substations 4 has not been acquired (step S24: No), the processing returns to step S21.

If the processing unit 14 determines in step S24 that the information of all the substations 4 has been acquired (step S24: Yes), the processing unit 14 determines the voltage value Vth to be taken in based on the information of the no-load voltage value Vo (step S25 ). For example, the input voltage value determining unit 23 determines the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4 ₁ to 4 _n , and selects the highest no-load voltage value Vo as the input voltage value Vth. can be determined to

The input voltage value determination unit 23 can also determine the input voltage value Vth based on the information on the no-load voltage value Vo and the information on the adjustment value Vadj. For example, assume that the highest no-load voltage value Vo among the no-load voltage values Vo ₁ to Vo _n of the plurality of substations 4 ₁ to 4 _n is the no-load voltage value Vo ₁ of the substation 4 ₁ . In this case, the input voltage value determining unit 23 may determine, for example, a value obtained by subtracting the adjustment value Vadj ₁ corresponding to the substation _4-1 from the no-load voltage value Vo ₁ of the substation _4-1 as the input voltage value Vth. can. When the processing shown in step S25 ends, the processing unit 14 ends the processing shown in FIG.

FIG. 5 is a flowchart illustrating an example of a capture determination process in the power supply device according to the first embodiment; Such import determination processing is executed at a preset cycle by the processing unit 14 .

As shown in FIG. 5, the command generation unit 24 of the processing unit 14 acquires information on the overhead wire voltage value Vst from the voltage measurement unit 13 (step S31), and receives information on the voltage value Vth taken from the voltage measurement unit 23. Acquire (step S32). Then, the command generator 24 determines whether or not the overhead wire voltage value Vst is greater than or equal to the captured voltage value Vth (step S33).

When the command generator 24 determines that the overhead wire voltage value Vst is equal to or greater than the fetched voltage value Vth (step S33: Yes), it outputs a fetched command to the power converter 12 (step S34). As a result, the power converter 12 converts the regenerated power generated in the overhead wire 2 into power with a voltage lower than that of the overhead wire 2 and outputs the power to the station building 7 . When the command generator 24 ends the process shown in step S34, or when it determines that the overhead wire voltage value Vst is not equal to or greater than the fetched voltage value Vth (step S33: No), it ends the process shown in FIG.

6 is a diagram of a hardware configuration of a processing unit of the power supply according to the first embodiment; FIG. As shown in FIG. 6 , the processing unit 14 of the power supply 10 includes a computer having a processor 101 , a memory 102 and an input/output circuit 103 .

Processor 101 , memory 102 , and input/output circuit 103 can transmit and receive data to and from each other via bus 104 , for example. The processor 101 reads out and executes the programs stored in the memory 102 to perform the functions of the no-load voltage value estimation unit 21, the no-load voltage information acquisition unit 22, the input voltage value determination unit 23, and the command generation unit 24. Execute. The processor 101 is an example of a processing circuit, for example, and includes one or more of a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a system LSI (Large Scale Integration).

The memory 102 includes one or more of RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Registered Trademark) (Electrically Erasable Programmable Read Only Memory). include. The memory 102 also includes a recording medium in which a computer-readable program is recorded. Such recording media include one or more of nonvolatile or volatile semiconductor memories, magnetic disks, flexible memories, optical disks, compact disks, and DVDs (Digital Versatile Disks). The processing unit 14 may include integrated circuits such as ASIC (Application Specific Integrated Circuit) and FPGA (Field Programmable Gate Array).

In the example described above, the power supply device 10 converts the regenerated power generated in the overhead line 2 into 210V system AC power and outputs it to the station building 7, but the regenerated power generated in the overhead line 2 is converted into DC power. It may be configured to output to a storage battery. In this case, the processing unit 14 of the power supply device 10 can output a capture command to the power conversion unit 12 when the overhead wire voltage value Vst becomes equal to or greater than the capture voltage value Vth. In addition, for example, the processing unit 14 controls the power conversion unit 12 in a state in which regenerative power is not generated in the overhead line 2, so that the DC power accumulated in the storage battery is converted to a DC voltage of 1500V system, which is higher than the overhead line voltage value. It can be converted into a large DC voltage. As a result, a DC voltage of 1500V system is supplied from the power supply device 10 to the overhead wire 2 .

As described above, the power supply device 10 according to the first embodiment includes the voltage measurement unit 13 , the input voltage value determination unit 23 , the command generation unit 24 and the power conversion unit 12 . The input voltage value determination unit 23 determines the highest no-load voltage value Vo among the no-load voltage values Vo of the plurality of substations 4 that supply power to the overhead lines 2, and based on the highest no-load voltage value Vo , the input voltage value Vth, which is the threshold value for determining whether or not the regenerated electric power of the electric car 1 is to be input from the overhead line 2, is determined. The voltage measurement unit 13 measures an overhead wire voltage value Vst, which is the voltage value of the overhead wire 2 . When the overhead wire voltage value Vst measured by the voltage measuring unit 13 is equal to or higher than the captured voltage value Vth determined by the captured voltage value determination unit 23, the command generation unit 24 requests capture of the regenerated power of the overhead wire 2. Generate directives. The power conversion unit 12 converts the regenerated electric power of the overhead wire 2 into electric power of a preset voltage when the command generation unit 24 generates the take-in command. Even if the no-load voltage values Vo of a plurality of substations 4 are different, the captured voltage value Vth can be determined with high accuracy.

Also, the power supply device 10 estimates the no-load voltage value Vo of each of the plurality of substations 4 based on the values of the current and voltage output from the rectifiers 42 of the plurality of substations 4 to the overhead lines 2. A no-load voltage value estimator 21 is provided. As a result, for example, even if the substation device 45 does not have the function of estimating the no-load voltage value Vo, the captured voltage value Vth can be determined with high accuracy.

In addition, the input voltage value determination unit 23 calculates the adjustment value Vadj of the no-load voltage based on the difference between the voltage value of the overhead wire 2 and the no-load voltage value Vo when the overhead wire 2 is in the no-load state. A captured voltage value Vth is determined based on the high no-load voltage value Vo and the adjustment value Vadj. As a result, for example, when the voltage output from the substation 4 drops for some reason in the section up to the measurement point P and reaches the measurement point P, it is possible to efficiently capture the regenerated power. A captured voltage value Vth can be determined.

The configuration shown in the above embodiment shows an example of the content of the present invention, and it is possible to combine it with another known technology, and one configuration can be used without departing from the scope of the present invention. It is also possible to omit or change the part.

1 electric car, 2 overhead line, 3 rail, 4, 4 ₁ to 4 _n substation, 5 high-voltage distribution system, 6 transmission line, 7 station building, 10 power supply, 11 communication unit, 12 power conversion unit, 13, 43 voltage measurement 14 processing unit 21 no-load voltage value estimation unit 22 no-load voltage information acquisition unit 23 input voltage value determination unit 24 command generation unit 31 adjustment value calculation unit 32 determination unit 41, 71 transformer, 42 rectifier, 44 current measurement unit, 45 substation equipment, 72 station load, 73 ₁ to 73 _m electrical equipment, 100 power system, P measurement point, Vadj, Vadj ₁ to Vadj _n adjustment value, Vo, Vo ₁ to Vo _n , Vo′ no-load voltage value, Vr1 power receiving side voltage, Vr2 power receiving side voltage, Vr3 power receiving side voltage, Vst overhead line voltage value, and Vth input voltage value.

Claims (4)

estimating a no-load voltage value of each of the plurality of substations based on values of current and voltage output to the overhead line from each rectifier in each of the plurality of substations that supply power to the overhead line; a voltage value estimator;
The highest no-load voltage value among the no-load voltage values is determined, and based on the highest no-load voltage value, a take-in voltage value, which is a threshold value for deciding whether or not to take in the regenerative electric power of the electric car from the overhead wire, is determined. a captured voltage value determination unit to determine;
A voltage measuring unit that measures an overhead wire voltage value, which is the voltage value of the overhead wire;
When the overhead line voltage value measured by the voltage measuring unit is equal to or higher than the captured voltage value determined by the captured voltage value determining unit, a command generation for generating a capture command requesting capture of the regenerative power of the overhead line. Department and
and a power conversion unit that converts the regenerated power of the overhead wire into power of a voltage lower than the voltage of the overhead wire when the command generation unit generates the take-in command. The captured voltage value determination unit
calculating an adjustment value of the no-load voltage value based on a difference between the voltage value of the overhead wire and the no-load voltage value when the overhead wire is in a no-load state, and calculating the highest no-load voltage value and the adjustment 2. The power supply device according to claim 1 , wherein said input voltage value is determined based on a value of . estimating a no-load voltage value of each of the plurality of substations based on values of current and voltage output to the overhead line from each rectifier in each of the plurality of substations that supply power to the overhead line; a voltage value estimator;
A voltage threshold of the overhead wire for determining the highest no-load voltage value among the no-load voltage values, and determining whether or not to take in the regenerative electric power of the electric car from the overhead wire based on the highest no-load voltage value and a capture voltage value determination unit that determines a capture voltage value. estimating a no-load voltage value of each of the plurality of substations based on current values and voltage values output to the overhead lines from respective rectifiers in the plurality of substations that supply power to the overhead lines; a step;
a second step of determining the highest no-load voltage value among the no-load voltage values;
and a third step of determining, based on the highest no-load voltage value, a take-in voltage value that is a threshold of the voltage of the overhead line for determining whether or not to take in the regenerative electric power of the electric train from the overhead line. A captured voltage value determination method characterized by:

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