Synchronous operation of dual-inverter-based photovoltaic system with low DC-voltages

Novel method of synchronized pulsewidth modulation (PWM) has been disseminated for control of cascaded (dual) inverters of photovoltaic installation with relatively low DC-voltages of two insulated photovoltaic panels, operating under condition of low level of solar irradiance. Control regimes are characterized by overmodulation control modes of two inverters in this case. Algorithms of synchronized PWM provide continuous voltage synchronization both in each inverter and in the load in the overmodulation control zone of inverters. Special attention has been given to analysis of operation of photovoltaic systems with different DC-voltages of two strings of photovoltaic panels. Results of simulations present a behavior of dual-inverter photovoltaic system with two discontinuous and one combined versions of synchronized PWM.