Optimized Design for AC Filter and Switching Frequency of Parallel-Connected Inverters With Global Synchronous Pulsewidth Modulation

This article proposes a new optimized design method for AC filter and switching frequency of parallel-connected inverters with global synchronous pulse width modulation (GSPWM) to improve the efficiency or reduce the cost. Being different from the traditional design methods that only focus on the individual inverter itself, the quantity of parallel-connected inverters and the operational principles of GSPWM are involved as the key considerations for designing the proper ac filter values and switching frequencies. In specific, the general principles and the realization details are comprehensively elaborated. Experimental results are presented to verify the proposed theoretical findings.