Electrified railway power balance collaborative flexible neutral section passing device and control method

Abstract

The invention relates to the technical field of alternating current electrified railway power supply, in particular to an electrified railway power balance collaborative flexible neutral section passing device and a control method. The device comprises an energy storage device, a train position monitoring device and a power adjusting device. The power adjusting device comprises a three-port converter composed of three single-phase converters VSC1, VSC2 and VSC3 which share a direct-current bus, and a transformer, a current transformer, a voltage transformer, an isolating switch and a circuit breaker which are correspondingly matched with each other; wherein one end of a primary winding of the second matching transformer is connected with a contact network of a neutral area through a current transformer, a circuit breaker and an isolating switch, and a secondary winding of the second matching transformer is connected with the alternating current side of the second converter through the circuit breaker. The system is suitable for a power balance allocation function between adjacent traction substations in various traction power supply modes, and is also suitable for a flexible neutral section passing function of various AC-DC type or AC-DC-AC type electric locomotives. The system is simple in structure, reliable in control method and easy to implement.

Description

technical field [0001] The present invention relates to the technical field of AC electrified railway power supply, in particular to an electrified railway power balance cooperative flexible transition phase separation device and a control method. Background technique [0002] my country's electrified railway generally adopts single-phase power frequency AC system, and the traction load is essentially a single-phase electric load with single-phase asymmetry. Therefore, electrified railways often adopt the scheme of commutation connection of traction transformers and partition power supply. Electric phase separation is set at the phase separation and partition power supply to form a neutral zone for electrical isolation between power supply arms. Since the electric split phase is essentially a non-electric section, the electric locomotive will reduce the running speed of the train and lose the traction force when the electric locomotive is over-phased, and the over-phased dev...

AI Technical Summary

Problems solved by technology

Since the electric split phase is essentially a non-electric section, the electric locomotive will reduce the running speed of the train and lose the traction force when the electric locomotive is over-phased, and the over-phased device operates frequently, and it is easy to generate large operating overvoltage and overcurrent during the operation process , there are many problems such as life and reliability, which seriously affect the reliability and safe and stable operation of the train's power supply. Theory and practice show that the electric phase separation is the weakest link in the traction power supply system

[0003] In addition, due to the existence of electrical phase separation, the traction network is divided into independent power supply arms segment by segment, and the power supply cannot be realized, which makes it difficult to conduct inter-station energy dispatch between traction substations, and the traction load fluctuates violently. It is difficult to reduce the maximum demand of the power station, which further leads to a low capacity utilization rate of power supply equipment such as traction transformers and a low utilization rate of regenerative energy feedback of electric locomotives, resulting in a lot of unnecessary waste

[0004] In the prior art, although the invention patent "a flexible automatic phase separation system and its control method" (publication number CN110626220A) provides a flexible automatic phase separation system and control method, but this scheme realizes the flexible phase separation function. On the basis of the ground automatic phase separation device, an additional set of three-terminal converters is added, and the structure is more complicated

In terms of control strategy, the energy storage device is only used as a backup power supply for failure, and it is not used to supply power to the neutral zone during normal operation, and the utilization rate of the energy storage device is low

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