Low-frequency oscillation suppression method for electrified railway vehicle network,

Abstract

The invention discloses a low-frequency oscillation suppression method for an electrified railway vehicle network, and belongs to the technical field of low-frequency oscillation suppression. The low-frequency oscillation suppression method for the electrified railway vehicle network is disclosed. The flexible AC power transmission system is an alternating-current power transmission system for improving power transmission capacity and enhancing controllability, which, based on control equipment based on a power electronic technology, is connected with a power transmission network system in series and parallel in a series-parallel hybrid mode or in an independent series-parallel mode. The flexible alternating-current power transmission system device has the characteristics that the adjustment is rapid and flexible, the system stability can be well improved, the damping of low-frequency oscillation of the system is increased, and when a large-capacity interconnected power system is subjected to large disturbance, and when low-frequency power oscillation or voltage oscillation occurs, the tide of the system is rapidly adjusted, so that the oscillation damping in the system is improved, the effects of suppression and damping are achieved, the static stability and the power transmission capability of the power transmission system are improved, the low-frequency oscillation accidentof the electrified railway is reduced, and then the safety of the high-speed railway traction network is improved.

Description

technical field [0001] The invention belongs to the technical field of low-frequency oscillation suppression, in particular to a method for suppressing low-frequency oscillation of an electrified railway vehicle network. Background technique [0002] With the rapid development of China's high-speed rail, high-speed, heavy-duty, and high-density have become important characteristics of current electrified railways. Therefore, higher and higher requirements are put forward for the reliability of power supply of high-speed rail. More and more new AC-DC-AC drives The operation of locomotives has greatly increased the complexity of the traction power supply system. It is against this background that the low-frequency oscillation phenomenon of the traction power supply system in my country occurs. This phenomenon is fundamentally an unstable phenomenon caused by the mismatch of vehicle network parameters. [0003] In recent years, there have been many low-frequency oscillation acci...

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Problems solved by technology

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for suppressing low-frequency oscillation of the electrified railway vehicle network, which solves the occurrence of many low-frequency oscillation accidents of electrified railways in China. When the oscillation is severe, it even leads to the blockage of locomotive traction and cannot operate normally. It has seriously affected the normal transportation order of the railway. This project takes the low-frequency oscillation phenomenon of electrified railway as the research object. When multiple EMUs start at the same time, the LSC of the EMU adopts the TCCS based on the traditional PI controller, which is likely to cause low-frequency oscillation of the traction network and affect the high-speed Safety Problems of Railway Traction Network