Control Method Research of Low Voltage Large Capacity Distribution Network Reactive Compensation and Harmonic Comprehensive Compensation

For current common problem that reactive power compensation and harmonic control equipment are difficult to balance reactive and harmonic synthesis dynamic governance in distribution network low-voltage systems, combined with the fact that APF capacity is small in the distribution network low voltage system and DSTATCOM can not compensate for the high order harmonic wave, on the basis of the main paralleled circuit topology which is multi-module type, this paper presents a comprehensive control strategy of the large capacity reactive power compensation and harmonic governance. By decomposing the current time capacity of reactive power compensation and harmonic governance into different frequency bands, and by different power modules, dynamic reactive power regulation and harmonic different frequency band compensation are achieved, which effectively improve the multi-module type APF flexibility in the cases of high-power applications. Theoretical analysis and simulation results show that the feasibility and effectiveness of reactive power compensation and harmonic different frequency band comprehensive compensation.