Harmonic Suppression Method Using Distributed Power Generation Reactive Compensation Device

Abstract

The invention belongs to the technical field of automatic control of power systems, and in particular relates to a decentralized wind power reactive power compensation device and method with harmonic suppression function. The invention includes an A-T hybrid reactive power compensation unit, a centralized control unit and a power module. A-T hybrid reactive power compensation unit includes thyristor controlled reactor bank (TCR), active power filter (APF) and passive filter bank. The thyristor controlled reactor bank is connected to the compensation access point between the passive filter bank and the main line of the power grid. The active power filter and passive filter bank are connected in series to form a hybrid active filter. The centralized control unit outputs pulse width modulation. The signal and trigger pulse signal trigger the APF transistor and the thyristor in the thyristor controlled reactor bank respectively. The invention effectively suppresses the resonance between the passive filter and the power grid, makes the harmonic compensation more accurate, the system responds faster, improves the safety of reactive power compensation, and is economical and practical.

Description

technical field [0001] The invention belongs to the technical field of electric power system automatic control, and in particular relates to a distributed wind power reactive power compensation device and method with a harmonic suppression function. Background technique [0002] At present, my country's power generation methods have caused great damage to the environment, and the use of decentralized power generation to make full use of the abundant "clean energy" in various places will greatly promote my country's sustainable development. [0003] Distributed power generation itself can generate a large amount of active and reactive power. If these energies can be used reasonably to improve power quality, it will save a lot of equipment investment. However, distributed power generation, especially the relatively mature wind power and solar power generation, has random and instantaneous energy sources, and cannot generate stable active and reactive power. This is equivalent ...

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Problems solved by technology

[0005] At present, the reactive power compensation method of distributed wind farms mainly adopts the combination of static var compensator (SVC) and fixed capacitor, but the passive filter in SVC has filtering characteristics affected by grid reactance and is prone to parallel resonance with grid reactance The inherent defects of the grid voltage will cause waveform distortion, voltage fluctuation and flicker, etc., which will have a significant negative impact on the distributed power generation system

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