JPS63291740A - Electric power failure detection circuit for electric power regeneration device - Google Patents

Abstract

PURPOSE:To make a self-exciting inverter usable through the exact detection of power receiving failure by providing a backward power detector which detects a backward power based on a regenerative power flowing at the 2nd power feed system, and a short time mock load sent to the 2nd power feed system at this detection time. CONSTITUTION:A regenerative power (route R2) circulating into a power receiving system 50 and a transformer system 51 at the time of power receiving failure is taken notice of, and a backward power relay 21 which has connected with respectively electric current and voltage elements from the seconds of the converter 25 and transformer 26 of a high pressure power distribution system 53, is connected. And the backward power relay 21 makes the direction (route P2) to be sent to the high distribution system 53 and a load 20 from a power receiving source 50 a forward power, and moreover, makes the direction (route R2) from the high distribution system 53 to the power receiving source 50 a backward power, that is, an action direction power, and each power is set. As a result, the backward power relay 21 can detect electric power heading in the power receiving source system 50 and transformer system 51 directions from a power regeneration device system 54, which is a characteristic at the power receiving failure time. Also, the breaker 22 of a mock load 23 is thrown in at the operation time of the backward power relay 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power regeneration device installed in an electric railway substation, and more particularly to a power failure detection circuit for a power regeneration device that can accurately detect power reception power failure.

[Conventional technology]

Conventionally, regarding electric railway DC substations equipped with power regeneration devices, Hitachi Review Vol. 68, No. 3 (1986), pp. 29-3
Discussed on page 2.

In the above-mentioned conventional devices, a separately excited inverter is used as the power regeneration device, and there has been no example using a self-excited inverter.

[Problem that the invention seeks to solve]

As mentioned above, there have been no examples of self-excited inverters being applied in the past. The reason is as follows. In the case of a separately excited inverter, the trigger pulse is generated based on an external signal (receiving voltage), so if a power failure is detected before the next trigger pulse is generated, the inverter can be stopped. On the other hand, self-excited inverters generate trigger pulses based on their own output power, so they continue to oscillate trigger pulses regardless of a power outage, so the inverter continues to operate despite power outages. As a result, regenerated power is detected by the undervoltage continuator at the receiving end.
This is because it may become impossible to detect a power outage of the entire system (specific operations will be described later in comparison with embodiments of the present invention).

In the above-mentioned conventional technology, when a self-excited inverter is used, there is a problem that a power outage in receiving power cannot be detected, and the self-excited inverter cannot be used in a wide range of application products such as inverters and converters.

An object of the present invention is to provide a power regeneration control device that can accurately detect and smoothly control a power outage when a power regeneration device is used, in order to use self-excited inverters with a wide range of application products. It is in.

[Means for solving problems]

The above objectives are achieved by providing a reverse power relay and a short-time rated simulated load.

That is, the present invention provides a first power supply system that converts received power from an electric power system into direct current and supplies it to an electric vehicle during road driving;
a second power supply system that supplies the received power to other loads via a circuit breaker; and a regeneration system that converts regenerated power from the electric vehicle into alternating current and supplies it to other loads of the second power supply system during first regeneration operation. A power regeneration control device installed in an electric railway substation comprising: a power regeneration system; A reverse power detector that detects reverse power based on the regenerated power flowing to the second power supply system and outputs a command signal to open a circuit breaker of the second power supply system, and a reverse power detector that is synchronized when the reverse power detector operates. and a short-time simulated load that is applied to the second power supply system.

[Function] In the event of a power outage, regenerative power current will flow from the power regeneration device of the regenerative system to the power receiving side via the second power supply system, but the reverse power relay will flow in the opposite direction of the second power supply system. By detecting the power supply and opening the circuit breaker of the second power supply system, the regenerative power is prevented from going around to the undervoltage relay, so it is possible to accurately detect the stop type. The regenerated power is then absorbed by the simulated load.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

First, a phenomenon that occurs when a self-excited inverter is used as a power regeneration device will be explained.

FIG. 1 is a single-line connection diagram using a self-excited inverter as the power regeneration device 27. In this figure, the regeneration control vehicle 15 (
When the regenerative vehicle (hereinafter referred to as a regenerative vehicle) is in motion, power is supplied to the DC power source through a power receiving system 50 that receives power from the power company, a transformer system 51 that converts AC to DC, and is supplied from the power line 16 through a feeding system 52. The regenerative vehicle 15 is supplied to the regenerative vehicle 15 (route P1
).

On the other hand, a power receiving system 50. Electric power is supplied through a high-voltage power distribution (hereinafter referred to as high-voltage distribution) system 53 (route P2.).

The above power supply route is the route Ps + shown by the solid line.
As shown in P2, when the vehicle is traveling, it follows a route in which both the power to the second regeneration vehicle 15 and the power to the load 2o are supplied from the electric power company.

Further, while the regenerative wheel 15 is performing regenerative braking, the motor in the first regenerative wheel 15 works as a generator, generating DC surplus power and pushing up the voltage of the feeder line 16. This voltage jump is detected by the power regeneration control device 27 built into the power regeneration device 10 through the DC transformer 14, and the power regeneration device 10 converts the DC to AC (power regeneration device system 54) L, high distribution system 53
Electric power is supplied to the bus bar of , and is consumed by the load 2o (route R1).

As a result of the above, the power supply from the electric power company is reduced by the amount of regenerated power, resulting in an energy saving effect.

However, if a power outage occurs during power regeneration,
The electric power converted to alternating current in the power regeneration system 54 flows into the power receiving system 50 and the transformer system 51 through the high distribution system 53 as shown by the broken line R2. Since the reference waveform to be detected depends on the waveform output by itself, the oscillation will not stop unless an external trigger is applied.Therefore, the lack of power connected to the secondary of the power receiving transformer 1 that detects a power outage. The voltage relay 2 remains under the condition that voltage is present on the primary side, and a power regeneration device using a conventional self-excited inverter cannot detect a power outage.

In addition, in Fig. 1, 3, 4, 12, 13°19.2
2 is a breaker, 5, 11.18 is a transformer, 6 is a rectifier,
24 and 25 are doing CT, and 14 and 16 are doing PT.

Next, the present invention will be explained in detail.

The present invention focuses on the regenerated power (route Rz) that goes around to the power receiving system 50 and the transformer system 51 during a power outage. , Reverse power relay 2 with current and voltage elements connected respectively
Connect 1. The reverse power relay 21 sends forward power in the direction (path Pa) from the receiving power source 50 to the high distribution system 53 and the load 20, and from the high distribution system 53 to the receiving power source 50 (path R
z) is set as the reverse direction power, that is, the operating direction power. With the above settings, the reverse power relay 21 is a feature at the time of a power outage. Power receiving system 50 from the power regeneration system 54.
It is possible to detect the power flowing in the direction of the transformer system 51, along the path R2 indicated by the dashed arrow.

Further, the reverse power relay 21 operates in the following two situations, including a power outage.

(1) At the time of a power outage (2) When the regenerated power is greater than the power consumption of the load 20 Therefore, there is a need for a method that performs the above two points of discrimination and reliably detects a power outage.

The regenerated power is transmitted to the receiving power source 50 as shown in the path Rz. Transformer system 51
direction, the reverse power relay 21 operates. As a result, in consideration of the case where the regenerated power in (2) above exceeds the load power consumption, the breaker 22 for the simulated load 23 is turned on,
Open the high voltage circuit breaker 17. Therefore, the power receiving system 50. The supply of power to the transformer system 51 is stopped, and no voltage is applied to the power receiving transformer 1 due to the regenerative power flowing through route Rz. In the case of a power receiving power outage, the undervoltage relay 2 operates and the regenerated power is If it exceeds the power consumption, it remains inactive, and it is possible to distinguish between (1) and (2) above.

In the case of a power reception power outage, the breaker 4 of the transformer system 51 is opened, power supply to the feeding system 52 is stopped, and while waiting for the power reception voltage to recover, the breaker 22 for the simulated load 23 is opened.

If the power reception is not due to a power outage, the high distribution breaker 17 is turned on, the breaker 22 for the simulated load 23 is opened, and normal operation continues. In this case, in order to prevent the reverse power relay 21 from operating again and the pumping phenomenon of the breaker, the breaker 22 for the simulated load 23 is turned on again with a timer monitoring the breaker 22 for a certain period of time according to the sequence, and the breaker 22 for the high distribution breaker 17 is turned on again. FIG. 2 summarizes one or more operations that are performed in conjunction with the detection of whether there is a power outage or whether the regenerated power exceeds the power consumption.

As described above, it has become possible to detect a power outage when a self-excited inverter is used in the power regeneration device 10.

〔Effect of the invention〕

According to the present invention, a self-excited inverter, which could not be used conventionally, can be used as a power regeneration device in a railway DC substation.

[Brief explanation of the drawing]

FIG. 1 is a single-line connection diagram of a railway DC substation showing an embodiment of the present invention, and FIG. 2 is a control flowchart of the present invention. 1... Power receiving transformer, 2... Undervoltage relay, 1o
...Power regeneration device, 15...Regenerative braking vehicle, 17...
・High-voltage breaker, 20... Load, 21... Reverse power relay, 23... Simulated load, 27... Regeneration control device,
50... Power receiving power supply, 51... Transformer source, 52... Power feeding system, 53... High voltage distribution system, 54... Power regeneration device system, Pz, P2... Power receiving supply path, R1, R2...
・Regenerative power supply route.

Claims (1)

[Claims] 1. A first power supply system that converts received power from the power system into DC and supplies it to the electric vehicle during power running, and a first power supply system that supplies the received power to other loads via a circuit breaker. 2 power supply system, and a regeneration system that converts regenerative power from the electric car into alternating current during regenerative operation and supplies it to other loads of the second power supply system. A regeneration device,
The regeneration system is controlled based on a detection signal of an undervoltage relay provided at a power receiving end of the first power supply system, wherein reverse power based on regenerative power flowing to the second power supply system is detected and the second power supply system is controlled. It is characterized by comprising a reverse power detector that outputs a command signal to open a circuit breaker in the power supply system, and a short-time simulated load that is applied to the second power supply system in synchronization with the operation of the reverse power detector. Power failure detection circuit for power regeneration equipment.