Novel parallel-connection electric energy quality controller

Abstract

The embodiment of the invention discloses a novel parallel-connection electric energy quality controller, and aims to solve the technical problems that a reactive compensation device difficultly realizes dynamic compensation for reactive power of a system, is narrow in reactive power adjustment range and cannot realize effective filtering in the prior art. The novel parallel-connection electric energy quality controller comprises a power supply, a load, a fundamental current detection module, a phase shift control circuit, a voltage source inverter and a coupling transformer, wherein the power supply is connected with the coupling transformer; the load is connected in parallel with a primary winding of the coupling transformer; the fundamental current detection module comprises a current mutual inductor and a fundamental current detection circuit; the current mutual inductor is connected with the primary winding of the coupling transformer; the current mutual inductor is further connected with the input end of the fundamental current detection circuit; the output end of the fundamental current detection circuit is connected with the input end of the phase shift control circuit; the output end of the phase shift control circuit is connected with the input end of the voltage source inerter; the output end of the voltage source inverter is connected with a secondary winding of the coupling transformer.

Description

technical field [0001] The invention relates to the technical field of power quality control, in particular to a novel parallel power quality controller. Background technique [0002] With the maturity of power electronics technology and PWM control technology, power quality controllers have entered the practical stage, and play an increasingly important role in the fields of reactive power compensation and grid harmonic suppression. So far, many topological structures have been proposed, and the goals of reactive power compensation and harmonic suppression vary with the characteristics of the application, but reactive power compensation generally adopts adjustable reactance to realize dynamic adjustment of system reactive power; harmonic suppression Generally, the purpose is to suppress the pollution of the grid branch by the harmonic current generated by the nonlinear load and the influence of the harmonic voltage of the grid on the load, that is, to reduce the equivalent ...

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Problems solved by technology

[0004] The embodiment of the present invention provides a new type of parallel power quality controller, which solves the problem that the reactive power compensation device in the prior art is difficult to dynamically compensate the reactive power of the system, and the reactive power adjustment range is narrow, and effective filtering cannot be performed, which is easy to cause nonlinear The technical problem that the harmonic current generated by the load flows into the power grid and causes pollution to the branch circuits of the power grid

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