Three-phase grid-connected inverters interface for alternative energy sources with zero-sequence component injection PWM method

This paper presents a grid-connected inverter interface for alternative energy generation with zero-sequence component injection PWM method. With a similar controller of active power filter (APF), the proposed inverter interface has double functions of improving power quality through the compensation of harmonics and reactive power and supplying an extra contribution of active power by alternative energy source. A novel zero-sequence component injection PWM method is adopted to improve the efficiency of the inverter. The simplicity and performance of the proposed inverter make it a great candidate for grid-connected alternative energy generation.