Research on multi-objective control strategy of split-capacitor-type three-phase four-wire distribution static generator

To meet the requirement of high reliability, practicability and stability in low cost, a multi-objective control algorithm is proposed based on split-capacitor-type three-phase four-wire distribution static generator. The control algorithm is implemented on improved ip-iq method and certain equivalent triangle conversion; then the six target components including negative, zero and base positive sequence reactive current, negative and zero sequence active current, harmonic current, are simultaneously detected; PI control and triangle wave modulating technique respectively is applied in DC side capacitor voltage stabilizing and reference current tracking. The control algorithm can achieve dispersion compensation or any composite compensation of six target components. A multi-objective distribution static generator model is simulated on PSCAD/EMTDC, while a prototype is built on the experimental platform based on FPGA+DSP, which validate the effectiveness of the proposed control strategy.