DC-Side Harmonic Mitigation in Single-Phase Bridge Inverter

Because of the instantaneous imbalance of the ideal input power and output power, the DC-side of the general inverters will be disturbed by the reactive power and the pulsation power of twice-frequency at the AC-side. This fact will be harmful for the security, stability and reliability of the system. This paper presents a power-decoupling module which is able to compensate for the twice pulsation power and the reactive power at the AC-side by controlling the voltage of the two series capacitors in the power-decoupling module. Consequently, the harmonic currents of the DC-side current will be eliminated. The disturbance of the DC source from the inverter will be reduced. The stability and the reliability of the system will be improved. This paper establishes the simulation model of the H-bridge inverter based on the power-decoupling module. The correctness and the feasibility of the proposed harmonic power decoupling technique based on the power-decoupling module have been verified through comparison and analysis.