Control compensation system and control method of quality of electric energy of magnetic suspension train

Abstract

The invention relates to a control compensation system of quality of electric energy of a magnetic suspension train, which comprises a passive filter bank and an active power filter which is connected with the passive filter bank in series through a transformer; a bypass inductor is also connected on the transformer in parallel; and the system also comprises a high-order passive filter which is connected with the passive filter bank and the active power filter in parallel. The active power filter is controlled into a reverse harmonic current source to enable the fundamental reactive current to mainly pass through the inductor, the transformer and the inductor reduce the capacity of the active power filter, the active power filter and the passive filter bank together filter the harmonics, and the high-order passive filter mainly filters the high-order harmonics which can not be filtered by the active power filter and the passive filter bank. The compensation system is connected to the 20kV side of a bus in a tractive power supply system of a high-speed magnetic suspension train to shorten the distance between a compensation point and a point of common coupling (PCC), thereby shortening the length of a coupling line, further weakening the amplification effect on harmonics and voltage fluctuation by the circuit, and improving the quality of electric energy.

Description

[0001] technical field [0002] The invention relates to a power quality control and compensation system and a control method for a maglev train. Background technique [0003] During normal operation, high-speed maglev trains absorb energy from the grid, and generate huge amounts of energy during braking. The maglev high-speed train traction power supply system contains a large number of high-power conversion modules (high-power rectifiers, inverters) and many other nonlinear components (transformers, etc.), which continuously generate variable frequency and voltage (VVVF) according to the speed of the train during operation. The current may bring uncertainty in power flow and substandard power quality, which will impact the power grid and have a certain impact on the safe and stable operation of the power grid and trains. [0004] The traditional treatment method is to use a parallel tuned passive filter, which is easily affected by the background harmonics of the power gr...

AI Technical Summary

Problems solved by technology

[0006] The power quality control and compensation system and control method of the maglev train provided by the present invention realize the control of the power quality of the maglev train system, solve the problem that traditional passive filters are easily affected by the background harmonics of the power grid, and greatly improve the power quality

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