Adaptive impedance coupling series injection type active power filter and control method

Abstract

The invention discloses an adaptive impedance coupling series injection type active power filter and a control method, and the filter comprises an active inverter which is connected with an adaptive impedance branch and a fundamental frequency resonance branch; one end of the self-adaptive impedance branch is connected with the power grid, and the other end is connected with the active inverter and the fundamental wave resonance branch; and one end of the fundamental frequency resonance branch is in three-phase star connection, and the other end of the fundamental frequency resonance branch is connected with the active inverter and the adaptive impedance branch. According to the invention, the wide-range reactive power compensation of the load is realized by controlling the triggering angle of the anti-parallel thyristors of the self-adaptive impedance branch; the alternating current side voltage of the inverter is reduced through the fundamental frequency resonance circuit, and the capacity requirement of the inverter is reduced; and suppression of load harmonic current is realized through the active inverter. According to the invention, the wide reactive compensation range and the low inverter capacity can be considered.

Description

technical field [0001] The invention relates to the field of current conversion technology in electrical engineering, in particular to an adaptive impedance coupling series injection type active power filter and a control method. Background technique [0002] With the development and popularization of power electronic equipment and motors, such as: frequency converters, servo drives, large air-conditioning systems, compressors, etc., power quality problems in the grid are becoming more and more serious, especially low power factor and harmonic pollution . Power quality problems not only increase the transmission loss in the power grid, but also reduce the reliability and safety of electronic equipment and affect the service life. [0003] Active filter (APF), static synchronous control system (DSTATCOM) and unified power quality controller (UPQC) have the functions of eliminating grid harmonics and compensating load reactive power, etc., and have excellent performance. Alt...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an adaptive impedance coupling series injection active power filter and a control method for the deficiencies of the prior art, which can suppress the harmonics generated by the TCR without an active inverter Under the premise, solve the problem that the low-capacity and wide-range reactive power adjustment of the inverter cannot be balanced, and realize the harmonic suppression and wide-range reactive power compensation functions of the low-capacity inverter

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