JP3244957B2 - Regenerative inverter control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a regenerative inverter, and more particularly to a method for controlling a regenerative inverter installed in each substation so that the regenerative amount of each regenerative inverter is equalized.

[0002]

2. Description of the Related Art In a system in which regenerative inverters are installed in a plurality of substations, there is a difference in regenerative energy of each regenerative inverter due to a difference in system voltage or the like in each substation. When the number increases, the regenerative capacity of the entire system has a margin, but the operation of only some regenerative inverters is close to the maximum capacity, so that the regenerative capacity of the entire system may have no margin.

[0003] Such a conventional regenerative inverter will be described with reference to FIG. DC feeder line 1a in a train line,
The regenerative energy generated in 1b is converted into AC by a regenerative inverter 2 composed of a thyristor rectifier circuit, and is regenerated to an AC system 4 via an inverter transformer 3. The operation of the regenerative inverter 2 is based on the AC current value Iac detected via the AC current transformer 5 and the DC current value Id detected via the DC current transformer 6 such as a Hall CT or a shunt reactor.
c and the DC voltage value E detected via the DC voltage detector 7
It is controlled by the control circuit 8 using dc. In the control circuit 8, the maximum value selection circuit 9 selects the larger one of the AC current value Iac and the DC current value Idc, and controls the minimum constant current control (minimum ACR) and the maximum constant current control (maximum) controlled by this value. The regenerative inverter is controlled by a combination of ACR, constant voltage control (AVR) controlled by a DC voltage Edc, and constant margin angle control (AγR) for securing a margin angle.

When the DC voltage Edc is equal to or less than the set value (voltage B) of the voltage reference setting circuit 10, the phase lead priority circuit 11 controls the minimum constant current control (minimum ACR) circuit 1.
2 is selected, and constant current operation is performed with the set value (current C) of the minimum current setting circuit 13. When the voltage does not reach the set voltage (voltage A) level of the regenerative level setting circuit 14, the switch 16 is closed by the output of the level detector 15, and the set value of the bias current setting circuit 17 is added by the adding circuit 18. As a result, the minimum current set value is cancelled, and the constant current operation at zero current is performed.

Further, when the DC voltage Edc becomes higher than the voltage reference value (voltage B), the output of the constant voltage control circuit 20 is selected by the phase delay selection circuit 19 and the phase advance selection circuit 11. When the regenerative current increases and reaches the current set value (current D) of the maximum current setting circuit 21, the maximum constant current control (maximum A
CR) circuit 22 is selected, and the control margin angle γ
Becomes the set value, the output of the constant margin angle control (open AγR) circuit 23 is selected. The control signal Ec determined in this way is input to the gate pulse generator 24, and generates a gate pulse at a firing angle corresponding to the control signal Ec to fire the thyristor of the regenerative inverter 2.

Accordingly, the control characteristics of the regenerative inverter are shown in FIG.
In the figure, P1 to P2 indicate the minimum constant current control (minimum AC
R) region, P2 to P3 are constant voltage control (AVR) regions,
P3 to P4 are the maximum current control (maximum ACR) areas. The region where the current is large is the constant margin angle control (open AγR) region.

The voltage reference setting circuit 10 shown in FIG.
The regenerative level setting circuit 14 has a fixed value. However, as shown in another conventional regenerative inverter 2 shown in FIG. 6, the output voltage of a converter device 25 installed in parallel with the regenerative inverter 2 The reference voltage and the regenerative level of the constant voltage control (AVR) are changed according to the voltage, and the voltage reference value arithmetic circuit 26 and the regenerative level arithmetic circuit 27
In some cases, and always operate in harmony with the converter device 25.

[0008]

In the above-described conventional method of controlling a regenerative inverter, when regenerative inverters are installed in a plurality of substations, each regenerative inverter sets a constant voltage control (AVR) set value to each substation. In a system that is set the same at each substation, the regenerative energy regenerated by each regenerative inverter installed at each substation depends on subtle differences in the system voltage at each substation and the distance from the point at which the regenerative vehicle applies regenerative braking. There is a problem that a balance occurs and some inverters bear a load while other inverters also have extra capacity, resulting in a loss of capacity. Also, in order to balance the load with such a system, it is necessary to determine the set value of each substation on the assumption of every case, and a test and analysis for that are required.

Further, as in the regenerative inverter shown in FIG. 6, an optimum constant voltage control (AVR) in each substation is performed.
When the configuration is such that the set value of AVR is changed according to the change of the system voltage so that the set value of is automatically set,
Since the regenerative inverters of a plurality of substations are set to different values due to the difference in each system voltage, the regenerative inverter set to a lower value bears the load, and increases the imbalance. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and an object of the present invention is to provide a control method of a regenerative inverter for controlling regenerative inverters installed in a plurality of substations in a direction in which regenerative amounts are equal. It is in.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a converter for supplying DC power and a vehicle capable of regenerative control on an overhead line of a DC feeding type electric railway. the regeneration based on the DC side voltage of the regenerative inverter lines substation is more established and a regenerative inverter for regeneration to the AC side regenerative energy
In a control method of a regenerative inverter including a control device that controls an inverter at a constant voltage, a regenerative amount of the regenerative inverter installed in each of the substations is detected, and the regenerative inverter installed in each of the substations is detected. A method of controlling a regenerative inverter, wherein a correction is made to a reference voltage for constant voltage control of the control device in a direction in which regenerative amounts become equal.

According to a second aspect of the present invention, a converter for supplying DC power and a regenerative inverter for regenerating regenerative energy generated by a vehicle capable of regenerative control to an AC side are provided on an overhead line of a DC feeding type electric railway. Based on the DC side voltage of the regenerative inverter of a system in which a plurality of substations are installed.
A control device that controls the regenerative inverter at a constant voltage.
And the control method for regenerative inverters, the average value of the regenerative current of the regenerative inverter of the plurality of substations, before the difference of the regenerative current of the average value and each of said substations
The method of regenerating the inverter, characterized in that adding the correction to the reference voltage of the constant voltage control of the serial control apparatus.

According to a third aspect of the present invention, a converter for supplying DC power and a regenerative inverter for regenerating regenerative energy generated by a vehicle capable of regenerative control to an AC side are provided on an overhead line of an electric railway of a DC feeding system. In a control method of a regenerative inverter of a system in which a plurality of substations are installed, a regeneration device having a small amount of regeneration is provided by adding a limiter circuit to a difference between regenerative currents obtained from the respective systems in which the respective regenerative inverters are provided. The inverter is controlled only in a direction to increase the regenerative amount or in a direction to decrease the regenerative amount by a regenerative inverter having a large regenerative amount.

[0014]

According to the present invention, the DC or AC current of the regenerative inverter installed in each substation is detected, and the output of each regenerative inverter is controlled to be equal to each other to be installed in each substation. The output of the regenerative inverter can be balanced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of an embodiment (corresponding to claim 1) of the present invention. The difference of this embodiment from the conventional example already described is that two substations A and B have regenerative inverters 2 respectively.
Is installed, each DC current or AC current signal is input, and the difference between the current signals of the regenerative inverter 2 of the substation A or B and the regenerative inverter 2 of the other substation B or A is added by the adding circuit 28. The reference voltage is corrected by performing an operation such as multiplying the value by a constant by an operation circuit 29 and adding the reference voltage to the constant voltage control of the voltage reference value operation circuit 26 by an adder circuit 30. It is configured to control in the direction that the output becomes equal,
Since other configurations are the same, the same portions are denoted by the same reference numerals and description thereof will be omitted.

As described above, in this embodiment, since the outputs of the respective regenerative inverters are controlled to be equal to each other, it is unlikely that a load is imposed on one regenerative inverter as in the prior art and the unbalance increases. Will be resolved. Further, in the present embodiment, the DC current of the regenerative inverter 2 is detected, but the same effect as that of the present embodiment can be obtained by using the AC current detected by the AC current transformer 5 instead of the DC current. it can.

FIG. 2 is a circuit diagram of a main part of another embodiment (corresponding to claim 2) of the present invention. As shown in the drawing, the present embodiment differs from the embodiment of FIG. 1 in that the regenerative amount Ia of the regenerative inverter of the substation and the average value of the regenerative amounts Ib, Ic,. Is added by an adder circuit 28, the result is multiplied by a constant by an arithmetic circuit 29, and added to the reference voltage for constant voltage control by the adder circuit 30 to correct the reference voltage. Are configured to be controlled in the direction in which the outputs become equal, and the other configurations are the same. Therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the embodiment shown in FIG. 1, a case is described in which regenerative inverters having the same capacity are provided at two substations. However, as in this embodiment, a circuit for controlling using an average value of the amount of regeneration is provided. In this way, the capacity of regenerative inverters installed at three or more substations can be balanced.

FIG. 3 is a circuit diagram of a main part of still another embodiment (corresponding to claim 3) of the present invention. As shown in the figure, the present embodiment is different from the embodiment of FIG. 1 in that a limiter circuit 31 is provided in an arithmetic circuit 29, and only a regenerative inverter with a small regenerative amount controls in a direction to increase the regenerative amount. The configuration is as described above, and the other configurations are the same. Therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted.

In the embodiment shown in FIG. 1, when there is a difference between the regenerative currents of the two regenerative inverters, both are controlled in a direction of increasing the regenerative inverter and in a direction of decreasing the regenerating inverter. Only the regenerative inverter having a small regenerative amount is configured to control the regenerative amount in a direction to increase the regenerative amount by the characteristics of the limiter circuit, whereby the capacities of both regenerative inverters can be balanced. Further, when the characteristics of the limiter circuit are reversed, only the regenerative inverters having a large regenerative amount are controlled in such a direction as to reduce the regenerative amounts, so that the capacities of both regenerative inverters can be balanced.

[0021]

As described above, according to the present invention,
Detect the DC current or AC current of the regenerative inverter installed in each substation, and control the output of each regenerative inverter to be equal to balance the output of the regenerative inverter installed in each substation. Therefore, it is possible to solve the problem that the load is imposed on one regenerative inverter and the imbalance increases as in the related art. Therefore, the capacity of the system installed in a plurality of substations can be given a margin.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of one embodiment of the present invention.

FIG. 2 is a circuit diagram of a main part of another embodiment of the present invention.

FIG. 3A is a circuit diagram of a main part of still another embodiment of the present invention, and FIG. 3B is a detailed diagram of an arithmetic circuit 29 and a characteristic diagram of a limiter circuit 31 of FIG. .

FIG. 4 is a circuit diagram of a conventional regenerative inverter.

FIG. 5 is a VI characteristic diagram of the regenerative inverter of FIG.

FIG. 6 is a circuit diagram of another conventional regenerative inverter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... DC feeder wire 2 ... Regeneration inverter circuit 3 ... Inverter transformer 4 ... AC system 5 ... AC current transformer 6 ...
DC current transformer, 7 DC voltage detection circuit, 8 control circuit, 9
... Maximum value selection circuit, 10 ... Voltage reference setting circuit, 11 ... Phase lead priority circuit, 12 ... Minimum constant current control circuit, 13 ... Minimum current setting circuit, 14 ... Regeneration level setting circuit, 15 ... Level detector, 16 ... Switch, 17 bias current setting circuit, 18 addition circuit, 19 phase delay selection circuit, 2
0: constant voltage control circuit, 21: maximum current setting circuit, 22:
Maximum current control circuit, 23: constant margin angle control circuit, 24: gate pulse generator, 25: converter device, 26: voltage reference value calculation circuit, 27: regeneration level calculation circuit, 28,
Reference numeral 30 denotes an addition circuit, 29 denotes an arithmetic circuit, and 31 denotes a limiter circuit.

Claims (3)

(57) [Claims] 1. A plurality of substations having a converter for supplying DC power and a regenerative inverter for regenerating regenerative energy generated by a vehicle capable of regenerative control to an AC side are installed on an overhead line of a DC feeding type electric railway. The times of the system being
Based on the DC voltage of the raw inverter,
In a control method of a regenerative inverter provided with a control device that controls a constant voltage of the regenerative inverter, a regenerative amount of the regenerative inverter installed in each of the substations is detected, and the regenerative inverter installed in each of the substations is detected. A method of controlling a regenerative inverter, wherein a correction is made to a reference voltage for constant voltage control of the control device in a direction in which regenerative amounts become equal. 2. A plurality of substations each having a converter for supplying DC power and a regenerative inverter for regenerating regenerative energy generated by a vehicle capable of regenerative control to an AC side on an overhead line of a DC feeding type electric railway. The times of the system being
Based on the DC voltage of the raw inverter,
A regenerative inverter control method comprising: the method of regenerating the inverter, characterized in that adding the correction to the reference voltage of the constant voltage control of the control device by. 3. A plurality of substations having a converter for supplying DC power and a regenerative inverter for regenerating regenerative energy generated by a vehicle capable of regenerative control to an AC side on an overhead line of a DC feeding type electric railway. In a method of controlling a regenerative inverter of a system, a regenerative inverter having a small regenerative amount increases a regenerative amount by adding a limiter circuit to a difference between regenerative currents obtained from the respective systems provided with the respective regenerative inverters. A method of controlling a regenerative inverter, characterized in that control is performed only in a direction in which the regenerative inverter has a large amount of regeneration or in a direction in which the amount of regenerative energy is reduced.