Mixed power quality treatment method

Abstract

The invention discloses a mixed power quality treatment method. In an active part, at least two groups of static var generators and at least two groups of active power filters are connected to a three-phase power network in a transformer isolation mode, wherein the static var generators mainly compensate reactive current, the active power filters compensate harmonic current, and when the voltage dips seriously, the active power filters can also make up for the deficiency of the static var generator capacity; and in a reactive part, a directly hung static var generator combined by a thyristor-controlled electric reactor and a thyristor switched capacitor, as well as a fixed capacitance compensator is directly connected to the three-phase power network for reactive compensation, three-phase unbalance is compensated, the thyristor switched capacitor provides large-capacity capacitive reactive power, the fixed capacitance compensator provides small-capacity reactive power, and the fixed capacitance compensator also serves as a main subharmonic filtering subcircuit of the thyristor-controlled electric reactor for coordinative comprehensive compensation and harmonic treatment of a power system.

Description

Technical field [0001] The invention relates to a power quality governance method, in particular to a novel parallel hybrid active and passive power quality governance method applied to a power supply and distribution system. Background technique [0002] The power quality of the power supply and distribution system is directly related to the stability of the power system, the safety of electrical equipment and the economical use of electricity. With the increasing use of power electronic devices and sensitive loads, the power quality problem has become the primary technical concern of the international power supply community, which is mainly reflected in voltage fluctuations, harmonics, flicker, etc., as well as reactive power and negative power in current. The influence of sequence, harmonic components, etc. Through the management of power quality, not only can the voltage fluctuation and flicker of the power distribution system be suppressed, but also the productivity of the ...

AI Technical Summary

Problems solved by technology

This method uses the traditional double-closed-loop control, which has high complexity for multiple PI adjustments.

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