Multi-converter parallel circulating current restraining method with quick and reactive support

Abstract

The invention discloses a multi-converter parallel circulating current restraining method with quick and reactive support. For a single converter, drop control calculation is adopted, and an output reference voltage of the converter is synthesized; resistance-capacitance virtual complex impedance is guided in the output current feedback of the inverter, so that the equivalent output impedance of the converter is of resistance-capacitance performance, wherein capacity component realizes quick and reactive support of the inverter, the resonant vibration between the output impedance of the inverter and the impedance of an electrified wire fence is restricted through resistance component, and fundamental wave circulating currents and harmonic circulating currents are reduced; and through a voltage current control loop, the stability and control precision of a system are further strengthened, and accurate distribution of power is realized. According to the method, the problem that the existing method is not high in power equipartition precision, relatively large in circulating current and relatively large in voltage fluctuation, and the method can be applied to power generation parallel control systems of industrial special power supply and new power supply.

Description

technical field [0001] The invention relates to the technical field of multi-converter parallel connection in industrial special power supply and new energy power generation, in particular to a multi-converter parallel connection circulating current suppression method with fast reactive power support. Background technique [0002] At present, more and more distributed power generation and renewable energy (such as wind energy, solar energy, etc.) are connected to the public grid or local loads through converters. In addition, in high-power industrial processing power supply devices, it is usually necessary to have multiple converter modules connected in parallel to form a multi-converter parallel environment, so as to achieve high current output. However, due to the withstand voltage and current-carrying limitations of power electronic power devices, the circulation and power distribution problems between converters caused by the parallel operation of multiple converters wil...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a multi-converter parallel circulating current suppression method with fast reactive power support in view of the deficiencies of the existing technology, so that when the existing method is applied to multi-converter parallel current sharing control, The problems of low power sharing accuracy, large circulating current and large voltage fluctuation

Images