Rail traction power supply system based on flywheel energy storage device and method for increasing power quality thereof

A flywheel energy storage and power supply system technology, applied in the direction of AC network load balancing, etc., can solve problems such as phase voltage balance and harmonic pollution of incapable traction transformers, and achieve the effects of improving operating efficiency, improving system power quality, and reducing investment.

Active Publication Date: 2017-12-19
DUNSHI MAGNETIC ENERGY TECH
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing technology cannot essentially realize the phase voltage balance and harmonic pollution of the traction transformer, the present invention provides a railway traction power supply system based on a flywheel energy storage device and a method for improving power quality

Method used

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  • Rail traction power supply system based on flywheel energy storage device and method for increasing power quality thereof
  • Rail traction power supply system based on flywheel energy storage device and method for increasing power quality thereof
  • Rail traction power supply system based on flywheel energy storage device and method for increasing power quality thereof

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] see figure 1 , a railway traction power supply system based on a flywheel energy storage device, including the existing railway power distribution room, the equipment that needs to be added is: Step-down transformer, install fuses and circuit breakers on the high-voltage side of the step-down transformer. In the entire electrical circuit, the flywheel energy storage device is connected to the feeder bus a and b through a converter and a transformer. The system composed of the transformer and the converter converts the single-phase alternating current on the feeder bus into a direct current output to the flywheel energy storage The flywheel energy storage device implements its own control strategy by collecting the voltage and current of the converter system.

[0031] see figure 2 , the back-to-back converter system connects the two-port tra...

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Abstract

The invention relates to a rail traction power supply system based on a flywheel energy storage device and a method for increasing power quality thereof. The system comprises a railway switching room, a flywheel energy storage device, a converter and step-down transformers respectively arranged on a phase a and a phase b of a power supply arm, wherein a fuse and a circuit breaker are arranged on the high-pressure side of each step-down transformer; in the whole electric circuit, the flywheel energy storage device is connected with feeding busbars a and b through the converter and the step-down transformers; the step-down transformers and a converter system are used for converting the single-phase alternating current on the feeding busbars into direct current and outputting to the flywheel energy storage device; the flywheel energy storage device is used for executing a control strategy in the manner of collecting the voltage and current of the converter system. According to the invention, complete three-phase voltage balancing and active power regulation can be realized; recycling and reutilization for the regenerative brake energy of the train are realized; the investment of the passing neutral section device is reduced; the running of the power system is more stable and the power quality of the system is increased; the rail traction power supply system is applicable to the common power grid and micro-grid.

Description

technical field [0001] The invention relates to a railway traction power supply system, in particular to a railway traction power supply system based on a flywheel energy storage device and a method for improving power quality. Background technique [0002] In recent years, electrified railways have developed rapidly. Due to the single-phase, high-power, nonlinear operating characteristics of trains and the increase in railway traffic volume and departure density, phase-to-phase imbalance is particularly obvious. As a typical impact load on The power quality of the power grid has been seriously affected. [0003] Because the phase-to-phase imbalance of the traction transformer will inject negative sequence current into the power supply system, the generation of negative sequence current will cause losses to the entire power supply and distribution system. Negative sequence current will cause the output of the generator to drop, generate additional vibration, cause uneven he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/30
CPCH02J3/30Y02E60/16
Inventor 陈鹰唐英伟王大杰叶才勇赵思锋张建平
Owner DUNSHI MAGNETIC ENERGY TECH
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