Series hybrid electric energy quality controller

Abstract

The invention discloses a series hybrid electric energy quality controller. The series hybrid electric energy quality controller comprises a transformer, a voltage source type inverter, a modulation signal generation module and a simplified passive filter, wherein the primary side winding of the transformer is connected between a power supply and a nonlinear load in series; the secondary side winding is connected with the output end of the voltage source type inverter in parallel; the modulation signal generation module is used for generating fundamental waves and specific sub-harmonic modulation control signals and sending the fundamental waves and the specific sub-harmonic modulation control signals to the voltage source type inverter; the voltage source type inverter is used for generating an alternating current signal at the same frequency as the modulation signal and sending the alternating current signal to the secondary side winding of the transformer; the primary side winding of the transformer presents low impedance to the fundamental waves, presents higher impedance to the specific sub-harmonics and presents high impedance to the harmonics besides the specific sub-harmonics; and the simplified passive filter presents high impedance to fundamental waves, and presents low impedance to the specific sub-harmonics. The series hybrid electric energy controller is relativelylow in cost, more practical and high in system stability and reliability.

Description

technical field [0001] The invention belongs to the field of power quality control, and more specifically relates to a series hybrid power quality controller. Background technique [0002] In order to achieve new energy consumption, efficient use of electric energy and flexible control, power electronic technology has been widely used in various fields such as power system generation, transmission, distribution, use, and storage. The power system has developed into a power electronic power system. Power electronic devices are nonlinear devices, and harmonic problems are inevitable. Harmonics are a kind of pollution and public nuisance to power systems. At the same time, the use of nonlinear loads such as rectifiers, frequency conversion speed control devices, and electric arc furnaces in distribution networks has been increasing in recent years. Therefore, more and more attention has been paid to the research on power equipment for harmonic control in power grids. [0003]...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the defects of the prior art, the purpose of the present invention is to provide a series hybrid power quality controller, aiming to solve the problem of using fundamental wave magnetic flux reverse compensation and harmonic forward full compensation in the existing series hybrid power quality controller. When the control method is used, since the inverter must adopt full-frequency tracking control, the stability of the inverter system is low.

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