Mixed induction type active electric power filter system

Abstract

The invention discloses a mixed induction type active electric power filter system. The mixed induction type active electric power filter system comprises a rectifier transformer, a filtering branch, a rectifier and the other filtering branch, wherein the other filtering branch comprises three passive filters and a voltage source inverter, the passive filters are connected to the voltage source inverter, the primary side of the rectifier transformer is connected to a three-phase power grid through connecting impedor, an epitaxy winding of the secondary side of the rectifier transformer is connected with the rectifier, and the passive filters are connected to three junction points between a delta winding and the epitaxy winding of the secondary side of the rectifier transformer in parallel respectively. According to the mixed induction type active electric power filter system, influence of frequency fluctuation of the power grid side and the high-capacity nonlinear load side on electric power filtering performance is eliminated; meanwhile, the problems that serious harmonic pollution, high additional loss of a master device, high vibration and noise, low system power factor and low system operation efficiency are caused by harmonic waves and idle work to an industrial power distribution and consumption system are effectively solved on the premise that electric power quality on the power grid side meets the national standard of China.

Description

technical field [0001] The invention relates to the field of harmonic control and reactive power compensation of industrial power distribution systems, in particular to a hybrid induction type power active filter system. Background technique [0002] Due to the inherent nonlinear characteristics of power electronic devices, when they are used in industrial power distribution systems, they will inevitably cause power quality problems such as serious harmonic pollution, low power factor, voltage flicker and imbalance. At the same time, because the short-circuit capacity of the industrial distribution network is generally smaller than that of the transmission network, there is also the problem of voltage distortion. [0003] At present, in solving the power quality problems of power systems and industrial power distribution systems, the main filtering technologies include passive filtering, active filtering and hybrid active filtering. Among them, passive filtering has been wi...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a hybrid induction power active filter system to eliminate the restriction of system impedance on power filter performance and eliminate frequency fluctuations on the power grid side and the large-capacity nonlinear load side in view of the shortcomings of the existing technology The impact on the performance of power filtering; at the same time, under the premise of ensuring that the power quality of the grid side meets the national standard, it can effectively solve the serious harmonic pollution caused by harmonics and reactive power to the industrial power distribution system itself, large additional loss of main equipment, and vibration Problems with high noise, low system power factor, and low system operating efficiency

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