JP5383169B2 - Power interchange system for DC electric railway and AC electric railway - Google Patents

Description

  The present invention relates to a power interchange system that automatically performs power interchange between a DC electric railway and an AC electric railway.

The power load of the substation in the electric railway has an intermittent characteristic that increases only during the time the train travels in the section where the power of the substation is supplied. Therefore, since the maximum power becomes large, it is necessary to set a large capacity of the substation. Moreover, since electric power has an intermittent characteristic, contract electric power becomes large compared with the electric energy actually used. For the above reasons, in electric railway systems, it is required to reduce the equipment cost by performing power load leveling.

When electric trains regenerate electric power in electric railways, electric power regenerative energy cannot be used effectively unless there is a train that runs in the vicinity. In DC electric railways, there are cases in which regeneration expires when there is no place for power regenerative energy. Further, when another train ends the power running state when the train is in a regenerative operation state, regeneration invalidation due to a rapid decrease in load occurs. In an AC electric railway, there is a concern that the power regenerative energy may flow backward to the power receiving side, that is, the power company side, adversely affecting the power transmission system. For the above reasons, it is required to efficiently absorb the electric power regenerative energy of the train into the power running energy of the train.

Thus, various devices have been developed in electric railways for leveling power load, preventing regeneration and invalidation, and effectively using regenerative power. For example, a power regeneration method using a DC power storage device in a DC electric railway described in JP 2000-233669 A (Patent Document 1) and JP 2001-260718 A (Patent Document 2) is a DC substation. A DC power storage device comprising a step-up / step-down chopper and a DC power storage device is installed on the DC side of the station, and if the external line voltage exceeds the upper limit of its rated voltage range due to regenerative operation of the electric vehicle, The external line voltage is stepped down by a pressure chopper, and the regenerative power of the electric vehicle is absorbed as a charging current of the DC power storage device from the external line via the step-up / step-down chopper.

The step-up / down chopper constituting the DC storage device includes a series circuit of a high-pressure side arm and a low-pressure side arm connected between a DC feeder and a rail, and a connection point between the high-pressure side arm and the low-pressure side arm. And a DC power storage device connected between the rail and the rail. The high-voltage side arm includes a first semiconductor switch having one end connected to the external line in a direction in which a charging current flowing from the external line can be controlled, and a first diode connected in reverse parallel to the first semiconductor switch, The arm is a second semiconductor switch that has the same direction of current control as the first semiconductor switch and is connected in series with the other end of the first semiconductor switch, and a second diode connected in reverse parallel to the second semiconductor switch. It is configured.

Japanese Unexamined Patent Publication No. 2000-102173 (Patent Document 3) describes a power leveling device for an AC electric railway. In other words, this power leveling device converts the AC power supply voltage at the time of no load or light load, passes through a power transformer, and converts the power into a power converter, charges the power storage device with its DC output, and converts the power at heavy load. The power storage device is operated as an inverter, the power storage device is discharged and orthogonally converted by the power converter, and the AC output is supplied to the load side via the injection transformer and the feeding transformer.

By the way, in the section where AC electric railway and DC electric railway are parallel, the AC electric railway and DC electric railway have conventionally been equipped with power storage systems in order to achieve power load leveling, regenerative deactivation prevention, and effective use of regenerative power. Is provided, the capacity of each power storage system is set to be large so as to exert a sufficient effect. As described above, since there are two power storage systems having a large installation capacity, there is a problem that the installation cost of a railway company having a section in which an AC electric railway and a DC electric railway are parallel is very high.
JP 2000-233669 A JP 2001-260718 A JP 2000-102173 A

In the section where the AC electric railway and the DC electric railway are parallel, it is to reduce the equipment cost of the power storage system for leveling the electric power load, preventing the regeneration from becoming invalid, and effectively utilizing the regenerative power.

In order to solve the above-described problems, a power storage device for a DC electric railway disposed between a feeder line and a rail of the DC electric railway in a section where the DC electric railway and the AC electric railway are parallel is provided. It is also used as a power storage device for AC electric railroads arranged between the cable and neutral wires, so that power can be interchanged between the DC electric railroad and the AC electric railroad.
That is, a power interchange system for a DC electric railway and an AC electric railway that solves the above-described problem is a power storage medium connected to a DC feeder circuit of a DC electric railway via a DC circuit breaker and a power converter, and the power converter. A DC power storage device configured with a control device for controlling the AC power supply circuit through an AC circuit breaker, a step-down transformer, and a DC / AC conversion device, and the control device is connected to a DC feeding voltage. The system is configured to control the power converter and the DC / AC converter based on the comparison between the power supply and the reference DC voltage and the comparison between the AC feeding voltage and the reference AC voltage. It is characterized by enabling mutual interchange of electric power between railway and AC electric railway.

According to the present invention, in the section where the AC electric railway and the DC electric railway are in parallel, the equipment cost of the power storage system that achieves power load leveling, regenerative invalidation prevention, and effective use of regenerative power can be reduced.
Further, according to the present invention, the power load of the DC substation of the DC electric railway and the power load of the AC substation of the AC electric railway are both leveled, and the equipment capacity is reduced and the contract power is reduced. The railway company's cost burden has been reduced.
Furthermore, since power interchange was performed between the DC electric railway and the AC electric railway, the number of trains in regenerative operation and trains in power running increased, and the possibility that power regenerative energy would expire significantly decreased. The use of electric brakes was expanded.
Furthermore, since energy regenerative energy is effectively used, energy saving can be realized.

The present invention provides a DC power storage device comprising a power storage medium connected to a DC feeder circuit of a DC electric railway via a DC circuit breaker and a power converter, and a control device for controlling the power converter. An AC circuit breaker, a step-down transformer and a DC / AC converter are connected to the AC feeder circuit, and the control device compares the DC feeder voltage with the reference DC voltage, and also compares the AC feeder voltage with the reference AC voltage. The system is configured to control the power converter and the DC / AC converter on the basis of the comparison with the above, enabling mutual interchange of power between the DC electric railway and the AC electric railway having parallel sections. This is a power interchange system for DC electric railways and AC electric railways.
The reference DC voltage is a lower limit reference DC voltage V _DC1 for determining whether the DC side is power running or an upper limit reference DC voltage V _DC2 for determining whether the DC side is power regeneration . The reference AC voltage is a lower limit reference AC voltage V _AC1 for determining whether or not the AC side is powering and an upper limit reference AC voltage V _AC2 for determining whether or not the AC side is power regeneration .

The power interchange system for a DC electric railway and an AC electric railway according to an embodiment of the present invention includes a DC feeding system 10 for a DC electric railway, as shown in an overall system configuration diagram of FIG. 1 and a main circuit configuration diagram of FIG. And the AC power supply system 20 of the AC electric railway, the power interchange is automatically performed via the power storage device 1. In the DC feeder system 10, DC power is supplied to the DC feeder 11 and the rail 12 from a plurality of DC substations 15 and 16 that are installed at predetermined intervals. The train 14 of the DC feeding system 10 is supplied with DC power from a DC feeding circuit composed of the DC feeder 11 and the rail 12 during power running, and supplies DC regeneration power to the DC feeding circuit during regeneration.

In the AC feeder system 20, a plurality of AC substations 25 are installed at predetermined intervals, and a feeder section 26 is provided between the AC substations. A plurality of auxiliary feeder section 27 and 28 are provided between the AC substation 25 and the section 26. Three-phase AC power is fed from the AC substation 25 to the trolley wire 21, rail 22, and AC feeder 23. The train 24 of the AC feeder system 20 is supplied with AC power from an AC feeder circuit composed of the trolley wire 21 and the rail 22 during power running, and supplies AC regeneration power to the AC feeder circuit during regeneration.

The power interchange system includes a power storage device 1, a power conversion device (DC / AC) 2, a control unit 3, a DC feeding voltage detection unit 4, and an AC feeding voltage detection unit 5. As shown in FIG. 2, the power storage device 1 includes a power storage medium 1A and a power converter 1B, and the power conversion device (DC / AC) 2 includes a DC / AC converter 2A and an AC / DC converter 2B. It is configured. The power storage device 1 is connected to a DC feeder 11 and a rail 12 of a DC feeder system 10 through a DC breaker 6, and includes a power converter (DC / AC) 2, a step-down transformer 7, and an AC breaker. It is connected to the trolley wire 21 and the rail 22 of the AC feeder system 20 via the device 8.

The control unit 3 is an information processing apparatus such as a personal computer including a storage unit in which a predetermined reference value is stored in advance. The control unit 3 uses the DC feeding voltage V _DC of the DC feeding voltage detection unit 4 and the AC feeding voltage V _AC of the _AC feeding voltage detection unit 5 as input signals, and the reference value stored in the storage unit Compared with, the power converter 1B and the power converter 2 are controlled based on the comparison result, and power interchange between the DC electric railway and the AC electric railway is performed.

That is, the storage unit of the control unit 3 stores in advance four reference values of the lower limit reference DC voltage V _DC1 and the upper limit reference DC voltage V _DC2 , and the lower limit reference AC voltage V _AC1 and the upper limit reference AC voltage V _AC2 . Then, the control unit 3 compares the input DC feeding voltage V _DC and the AC feeding voltage V _AC with these reference values according to a calculation program. The arithmetic program is stored in advance in the storage unit of the control unit 3. As shown in Table 1, the comparison results between the two input signals and the four reference values are “AC side power running, DC side power running—state 1”, “AC side power running, no DC side load—state 2”, “AC side power running” , DC side power regeneration-state 3 "," No AC side load, DC side power running-state 4 "," No AC side load, no DC side load-state 5 "," No AC side load, DC side power regeneration- Nine types of "state 6", "AC side power regeneration, DC side power running-state 7", "AC side power regeneration, no DC side load-state 8" and "AC side power regeneration, DC side power regeneration-state 9" It becomes. Hereinafter, with reference to FIG. 3 which is a flowchart of an example of an arithmetic program, how power interchange is performed between the DC electric railway and the AC electric railway according to the present invention will be described.

(AC side power running, DC side power running-State 1)
Control unit 3, the AC feeding circuit voltage V _AC is smaller than the lower limit reference AC voltage V _AC1 state, i.e., determines whether the AC side power running state (101), the determination result goes to No if step 104. If the decision result in the step 101 is Yes, the control unit 3 is the DC feeding circuit voltage V _DC is less than the lower limit reference DC voltage V _DC1 state, that is, whether the DC side power running state (102), the determination result is No If so, go to Step 103. If the determination result in step 102 is Yes, the power storage device 1 and the power conversion device are discharged so that the control unit 3 discharges from the power storage medium 1A because the power is in the AC side power running and the DC side power running (state 1). 2 is controlled.

(AC side power running, DC side no load-state 2)
If the decision result in step 102 is No, the controller 3 determines whether or not the DC _feeding voltage V _DC is not lower than the lower limit reference DC voltage V _{DC1 and not} higher than the upper limit reference DC voltage V _DC2 , that is, whether there is no DC side load. Determine (103). If the determination result in step 103 is Yes, the control unit 3 is discharged from the power storage medium 1 </ b> A because the power is on the AC side and no load is on the DC side (state 2). Thus, the power storage device 1 and the power conversion device 2 are controlled.

(AC side power running, DC side power regeneration-State 3)
If the decision result in the step 103 is No, since none of the state without DC side load and the DC side power running state, a direct current feeding circuit voltage V _DC is greater than the upper limit reference DC voltage V _DC2 state, i.e., the DC-side power regeneration state It is. At this time, since it is in the AC side power running and the DC side power regeneration state (state 3), the control unit 3 exchanges power from the DC feeding system 10 side to the AC feeding system 20 side, and the power storage medium. The power storage device 1 and the power conversion device 2 are controlled so as to charge 1A.

(No AC side load and DC side power running-State 4)
If the decision result in the step 101 is No, the control unit 3 determines whether and upper reference alternating voltage V _AC2 following state AC feeding circuit voltage V _AC is lower reference alternating voltage V _AC1 above, i.e. without AC side load state If the determination result is No, the process proceeds to step 107. If the decision result in the step 104 is Yes, the control unit 3 determines the DC feeding circuit voltage V _DC is less state than the lower limit reference DC voltage V _DC1, namely whether the DC side power running state (105), the determination result is No If so, go to Step 106. If the determination result in step 105 is Yes, since there is no AC side load and DC side power running (state 4), the control unit 3 discharges from the power storage medium 1A and supplies power to the DC feeding system 10 side. The power storage device 1 and the power conversion device 2 are controlled so as to be flexible.

(No AC side load, no DC side load-Condition 5)
If the decision result in the step 105 is No, the control unit 3 and the upper reference DC voltage V _DC2 following state DC feeding circuit voltage V _DC is lower reference DC voltage V _DC1 or more, i.e., whether no DC side load state Determine (106). If the determination result in step 106 is Yes, since there is no AC side load and no DC side load (state 5), the control unit 3 stores the power so that the power interchange system according to the present invention is in a standby state. The apparatus 1 and the power converter 2 are controlled.

(No AC side load, DC side power regeneration-state 6)
If the decision result in the step 106 is No, since none of the state without DC side load and the DC side power running state, a direct current feeding circuit voltage V _DC is greater than the upper limit reference DC voltage V _DC2 state, i.e., the DC-side power regeneration state It is. At this time, since there is no AC side load and the DC side power regeneration state (state 6), the control unit 3 stores power so as to charge the power storage medium 1A with power from the DC feeding system 10 side. The apparatus 1 and the power converter 2 are controlled.

(AC side power regeneration, DC side power running-state 7)
If the decision result in the step 104 is No, since neither without AC side load and the AC side power running state condition, the control unit 3 has an AC feeding circuit voltage V _AC is greater than the upper limit reference AC voltage V _AC2 state, i.e., AC It determines with it being in a side electric power regeneration state. Subsequently to step 104, the control unit 3 determines the state DC feeding circuit voltage V _DC is less than the lower limit reference DC voltage V _DC1, namely whether the DC side power running state (107), if the determination result is No Proceed to step 108. If the determination result in step 107 is Yes, the control unit 3 is in the state of AC side power regeneration and DC side powering (state 7), so that the control unit 3 provides power accommodation from the AC feeder system 20 side to the DC feeder system 10 side. The power storage device 1 and the power conversion device 2 are controlled so as to charge the power storage medium 1A.

(AC side power regeneration, no DC side load-state 8)
If the decision result in the step 107 is No, the control unit 3 and the upper reference DC voltage V _DC2 following state DC feeding circuit voltage V _DC is lower reference DC voltage V _DC1 or more, i.e., whether no DC side load state Determine (108). If the determination result in step 108 is Yes, the control unit 3 charges the power storage medium 1A with power from the AC feeding system 20 side because AC power regeneration and no DC load are present (state 8). Thus, the power storage device 1 and the power conversion device 2 are controlled.

(AC power regeneration, DC power regeneration-state 9)
If the decision result in the step 108 is No, since none of the state without DC side load and the DC side power running state, the control unit 3 is the DC feeding circuit voltage V _DC is greater than the upper limit reference DC voltage V _DC2 state, i.e., DC It determines with it being a side electric power regeneration state. At this time, since it is in an AC side power regeneration and DC side power regeneration state (state 9), the control unit 3 stores power with both power from the DC feeding system 10 side and the AC feeding system 20 side. The power storage device 1 and the power conversion device 2 are controlled so as to charge the medium 1A.

1 is an overall configuration diagram of a power interchange system for a DC electric railway and an AC electric railway according to an embodiment of the present invention. It is a circuit block diagram of the principal part of the electric power interchange system of the DC electric railway and AC electric railway of one Example of this invention. It is a flowchart which shows an example of the flow of a process of the electric power interchange system of the DC electric railway and AC electric railway of one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power storage device 1A Power storage medium 1B Power converter 2 Power conversion device (DC / AC)
2A DC / AC converter 2B AC / DC converter 3 Control unit 4 DC feeding voltage detection unit 5 AC feeding voltage detection unit 6 DC circuit breaker 7 Step-down transformer 8 AC circuit breaker 10 DC feeding system 11 DC feeding Electric wire 12 Rail 14 Trains 15 and 16 DC substation 20 AC feeder system 21 Trolley wire 22 Rail 23 AC feeder 24 Train 25 AC substation 26 Feed section 27, 28 Auxiliary feed section

Claims (10)

A DC power storage device comprising a power storage medium connected to a DC feeder circuit of a DC electric railway via a DC circuit breaker and a power converter, and a control device for controlling the power converter, an AC circuit breaker, It is connected to an AC feeder circuit via a step-down transformer and a DC / AC converter, and the control device determines a DC feeding voltage and a lower limit reference DC voltage for determining whether or not the DC side is powered. Comparison with the upper limit reference DC voltage to determine whether or not regeneration , and AC reference voltage and lower limit reference AC voltage to determine whether the AC side is power running and whether the AC side is power regeneration The system is configured to control the power converter and the DC / AC converter based on the comparison with the upper limit reference AC voltage of the power supply, and the mutual power between the DC electric railway and the AC electric railway having parallel sections is configured. Versatility DC electric railway and an AC electric railway power interchange system, characterized in that made possible. Smaller than the DC feeding circuit voltage the lower limit reference DC voltage, and when the AC feeding circuit voltage is less than the lower limit reference alternating voltage, said control device the power converter and the like to discharge the power storage medium 2. The electric power interchange system for a DC electric railway and an AC electric railway according to claim 1, wherein the DC / AC converter is controlled. Smaller than the DC feeding circuit voltage the lower limit reference DC voltage, and when the AC feeding circuit voltage is below the lower limit reference upper limit reference alternating voltage in the alternating voltage or higher, the control device together with discharging the power storage medium, 2. The DC electric railway and the AC according to claim 1, wherein the power converter and the DC / AC converter are controlled so that power is exchanged from the AC feeding circuit to the DC feeding circuit. Electric railway power interchange system. Smaller than the DC feeding circuit voltage the lower limit reference DC voltage, and when the AC feeding circuit voltage is greater than the upper limit reference alternating voltage, the control device will power interchange the AC side regenerative power to the DC feeding circuit circuit, and 2. The DC electric railway and the AC according to claim 1, wherein the power converter and the DC / AC converter are controlled to charge the power storage medium with surplus power that cannot be consumed by the AC feeder circuit. Electric railway power interchange system. The upper limit reference DC voltage below the DC feeding circuit voltage the lower limit reference DC voltage or more and when the AC feeding circuit voltage is less than the lower limit reference alternating voltage, the control device together with discharging the power storage medium, said 2. The direct current electric railway and the alternating current electricity according to claim 1, wherein the power converter and the direct current / alternating current converter are controlled so that electric power is exchanged from the direct current feeder to the alternating current feeder. Railway power interchange system. The upper limit reference DC voltage below the DC feeding circuit voltage the lower limit reference DC voltage or more and when the AC feeding circuit voltage is the lower than the upper limit reference alternating voltage with the lower limit reference alternating voltage or higher, the control device the power storage medium 2. The power interchange system for a DC electric railway and an AC electric railway according to claim 1, wherein the power converter and the DC / AC converter are controlled so as to be in a standby state. DC feeding circuit voltage upper limit reference DC voltage by the lower-limit reference DC voltage or less, and when the AC feeding circuit voltage is greater than the upper limit reference alternating voltage, wherein the control device stores the AC side regenerative power to the power storage medium 2. The power interchange system for a DC electric railway and an AC electric railway according to claim 1, wherein the power converter and the DC / AC converter are controlled so as to cause the power converter to operate. Larger than the DC feeding circuit voltage upper limit reference DC voltage, and when the AC feeding circuit voltage is less than the lower limit reference alternating voltage, the control device will power interchange the DC side regenerative power to the AC feeding circuit circuit, 2. The DC electric railway according to claim 1, wherein the power converter and the DC / AC converter are controlled to charge the power storage medium with surplus power that cannot be consumed by the DC feeder circuit. AC electric railway power interchange system. Larger than the DC feeding circuit voltage upper limit reference DC voltage, and when the AC feeding circuit voltage is the lower than the upper limit reference alternating voltage with the lower limit reference alternating voltage or higher, the control device the power storage medium with DC side regenerative power 2. The electric power interchange system for a DC electric railway and an AC electric railway according to claim 1, wherein the power converter and the DC / AC converter are controlled so as to charge the battery. Larger than the DC feeding circuit voltage upper limit reference DC voltage, and when the AC feeding circuit voltage is greater than the upper limit reference alternating voltage, said control device the power converter and the DC so as to charge the power storage medium The power interchange system for a DC electric railway and an AC electric railway according to claim 1, wherein an AC / AC converter is controlled.

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