Single-phase inverter voltage control and parallel circulation current suppression

Load disturbance is the main reason affecting the performance of the power inverter. The existence of the output impedance is the underlying reason of load disturbance. This paper analysis the inverter output voltage waveform and circulation suppression control methods from the perspective of output impedance. Through PID control and instantaneous feedback technology, it could change the characteristics of the inverter´s output impedance, as well as the circulation impedance of the parallel inverters .It improved the output voltage waveform and effectively curbed the circulation current in parallel systems.