Abstract:A new design of low harmonies and low loss three phase grid-connected inverter is proposed. Full-bridge DC-DC converter uses zero current soft switching technology to solve the problem of high switching losses. DC-AC inverters use selective harmonic elimination PWM technique to reduce the inverter switching frequency by approximately 50% and switching losses. Matlab simulation tests prove the feasibility of the program, provide a theoretical basis for practical engineering applications and products and early experiments for the preparation.