Output‐voltage feedback control topology for inverters dedicated to renewable energy systems

Summary We present a new control topology for inverters, mainly dedicated to renewable energy applications. The originality is due to the integration in the inverter of an adaptive regulation of its output voltage controlled by a closed feedback loop allowing compensating the voltage drops induced by load variations. The feedback control is based on an adaptive pulse wave modulation (APWM) technique, that controls the power switches of the inverter to obtain the purest possible sine‐wave voltage. The APWM technique straightforwardly compares the inverter output voltage with a reference signal at the grid frequency. In this contribution, this technique is applied to a single‐phase push‐pull inverter but could have been integrated for the control of all kinds of inverter topologies in renewable energy systems. We have shown that the APWM technique allows generating pure sine‐wave voltage, with low total harmonic distortion compared with the generally obtained by classical systems and that load variations do not affect the quality of the output. An experimental prototype of a single‐phase inverter with an adaptive regulation based on APWM technique was developed. The experimental characterizations of the prototype confirm the simulations.