Design considerations in sliding-mode controlled parallel-connected inverters

This work presents the design of three sliding-mode control schemes for a modular inverter system composed of N parallel-connected buck-based single inverters. AC output voltage regulation and balanced current-sharing among the single inverters is achieved by means of a set of switching surfaces and the corresponding sliding control laws. On the other hand, a set of design restrictions is established in terms of the inverter parameters and the AC output signal amplitude and frequency, thus facilitating the subsequent design procedure. Experimental results for both resistive and nonlinear loads are provided to illustrate the application of the method.