Scattered power generation reactive compensation device and method with harmonic suppression function

Abstract

The invention belongs to the technical field of automatic control of a power system, in particular to a scattered power generation reactive compensation device and method with the harmonic suppression function. The scattered power generation reactive compensation device comprises an A-T mixing reactive compensation unit, a central control unit and a power supply module. The A-T mixing reactive compensation unit comprises a thyristor control reactor set (TCR), an active power filter (APF) and a passive filter set, wherein the thyristor control reactor set is connected with a compensation access point between the passive filter set and a power grid main line, and the active power filter and the passive filter set are in serial connection to form a mixing active filter. The central control unit can output pulse width modulation signals and triggering pulse signals which can respectively trigger an APF thyristor and a thyristor in the thyristor control reactor set. The scattered power generation reactive compensation device and method with the harmonic suppression function can effectively restrain resonance between the passive filter and the power grid, enables harmonic compensation accuracy to be higher and system response to be quick, improves reactive compensation safety 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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