JPS5939340B2 - Stationary reversible power converter for DC railways - Google Patents

Description

[Detailed Description of the Invention] This invention utilizes a diode and a sirisk that can switch on and off a steady current or cut off a fault current in a direct current main circuit of several hundred to several thousand amps and several thousand to tens of thousands of amperes. The present invention relates to a stationary reversible power converter for DC electric railways equipped with a fixed switch.

Electricity is supplied to DC electric railway trains from rectifiers at multiple substations adjacent to each other, via heavy-duty high-speed circuit breakers, and feeder lines.

Recently, in DC electric railways, chopper-controlled trains equipped with regenerative brakes have been increasingly used from the viewpoint of power saving.

In the case of such trains, the regenerative power generated by the train during regenerative braking often exceeds the power consumption of the running train during times other than the morning and evening rush hours.

For this reason, an inverter is connected to the DC bus of the electric railway substation,
Regenerated power is returned to the AC power system.

Generally, the regenerative power of a train is related to the overhead line voltage as well as the running conditions of the train, so that the electric train can perform full regenerative braking only when the overhead line voltage is within a certain range.

For this reason, although the voltage of the rectifier can be controlled, it is desired to develop an economical device that can make the entire device as small as possible.

This invention was made to satisfy these demands, and by taking advantage of the gate control function of the rectifier of DC electric railway substations and replacing high-speed heavy duty circuit breakers with solid-state switches, the entire system can be made smaller. It is an object of the present invention to provide an economically advantageous stationary reversible power converter.

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

In the figure, numbers 41 and 82 are electric railway substations that are adjacent to each other.
Power is being transmitted to 01,102.

From the AC power supply system 37 to the overhead contact line 1 at the substation 4 for electric railways
The forward converter for supplying DC power to 01 and 102 receives power from the AC power supply system 37, and receives power through a rectifier including a disconnector 31, an AC breaker 32, a rectifier transformer 33, and a forward converter 34. DC power is supplied to the DC bus 35.

Power is further supplied from the DC bus 35 to a plurality of sets of main systems.

That is, the heavy duty disconnector 15, 18°2 from the DC bus 35
1.24, Thyristor 17゜20,2 that opens and closes the feeding system
Power is transmitted to overhead contact lines 101 and 102 via lines 3 and 26.

On the other hand, an inverse converter that returns regenerated power from the overhead contact lines 101 and 102 to the AC power supply system 37 includes a disconnector 11, an AC breaker 12, a rectifier transformer 13, and an inverter 14. DC power is supplied from 102 via a DC bus 36.

The contact line 101, 102 and the DC bus 36 are diode 1.
6, 19, 22, and 26.

Therefore, the thyristor 17 and the diode 16 constitute a solid state switch 27, and similarly the other diodes 19,
22, 25 and Sairisk 20, 23, 26 constitute a solid state switch 28°29.30.

The electric railway substation 82 also has an AC power supply system 77, a disconnector 51, 71, an AC breaker 52, like the electric railway substation 41 described above.
72, rectifier transformer 53, 73, forward converter 73, inverse converter 54, DC bus 75.76, load disconnector 55, 5
8°61.64, diode 56, 59.62.65,
It is composed of thyristors 57, 60, 63, and 66.

Note that 103, 104, 105, and 106 are contact lines 1
01,102 are the sections, 1,2 are the trains 67, 68, 69, 70 are the solid state switches.

Therefore, the forward converter 34°74 and the inverse converter 14
, 54 are each composed of a plurality of cylinders, and each cylinder is supplied with a predetermined ignition signal by an ignition device (not shown) to control conduction between the cylinders.

Naoki heavy duty disconnector 15, 18, 21. 24, 55, 58
゜61.64 is normally closed and opened during inspections, etc.

Next, in order to cut off the load current flowing through the solid state switches 27 to 30, for example 70 among the solid state switches 27 to 30, the related forward converter 74 is gate-blocked or the ignition phase is delayed and the gate is shifted in the impark region. Once operated, the solid state switches 67 to 7 belonging to the same substation 82
After the fault current disappears, the load current flowing in the normal main system can be quickly reduced to 0, and power can be retransmitted to the healthy main system by gate control of the forward converter 74 and by applying gate pulses to the solid state switches 67 to 69 belonging to the healthy main system. good.

Since the load current supplied from the adjacent substation 41 does not overlap and flow through the solid state switches 67 to 69 belonging to the same substation 82, the load current can be cut off reliably.

In this case, regenerated power from, for example, 102 of the overhead contact lines 101 and 102 flows through the diode 65 of the solid state switch 70.

The functions required of a conventional high-speed breaker (a breaker equipped with a mechanical part, a movable part, and an arc chute open and close the steady current of the DC main circuit or cut off the fault current) are as follows: If DC power is mainly switched on and off and the power source is present on the overhead contact line, the voltage on the overhead contact line cannot be extinguished even if the high-speed circuit breaker is opened.

However, diodes are sufficient to connect the overhead contact lines 101, 102 and the DC buses 36, 37 for regenerative power, and to separate each main system using a solid state switch.

For this reason, in this invention, the forward converter 74 and the inverse converter 54
and diodes 56, 59, 6 of solid state switches 61-70
2゜65, thyristor 57, 60, 63, 66, and thyristors 57, 60, 63, and 66, respectively, so that the load current and regenerative current can be clearly distinguished, and the load current from other substations 41 is not a problem. The heavy duty solid state switch 70 of the substation 82 which is installed is reversely connected to the heavy duty solid state switch 69 installed in parallel.
Since the load current is not sent out again to the next main system through the process, the gate block of the forward converter 74 of the substation in question can reliably cut off the load current flowing to the solid state switch.

The example described above is only on the forward converter 74 side of the substation 82, but since the operation is the same in other cases, the explanation thereof will be omitted here.

According to the invention described above, a double DC bus is connected to the output side of the rectifier (forward converter, reverse converter) of the electric railway substation, and a solid state switch consisting of a diode and a silice is connected to this. It is possible to provide an economically advantageous stationary reversible power converter for DC electric railways, which allows the entire device to be miniaturized.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. 1.2...train, 101,102...
Electric line, 14.54... Inverse converter, 34,74
...Forward converter, 35, 36...DC bus, 75, 76...DC bus, 16, 19,
22, 25, 56, 59°62.65, 20, 23, 2
6, 57, 60, 63... Diode, 17.
...Sirisk, 27-30...Solid switch, 67-70...Solid switch, 41,
82...Electric railway substation, 37,77...
AC power system.

Claims (1)

[Claims] 1 For DC electric railways, which can supply DC power to overhead contact lines by combining a multi-phase static forward converter and a multi-phase static reverse converter consisting of multiple thyristors, or can return regenerated power from overhead contact lines to the AC power system. In the static reversible power converter, one and the other of dual DC buses are connected to the output sides of the forward converter and the inverse converter, respectively, and anodes of at least two thyristors are connected to the DC bus connected to the forward converter. The cathodes of at least two diodes are connected to one and the other of the overhead contact line, respectively, and the cathodes of at least two diodes are commonly connected to a DC bus bar connected to the inverter, and the anodes of the diodes are connected to one and the other of the overhead contact line. , power supply or power outage to the overhead contact line is possible by gate control of the cyrisk, and regenerative power generated by the electric train connected to the overhead contact line can be returned to the inverter via the diode. This is a static reversible power converter for DC electric railways.