Research and improvement of current predictive control for the three-phase grid connected inverter

Abstract

According to the characteristics of high performance three-phase grid-connected inverters, the strategy of model current predictive control for three-phase grid-connected inverters without PLL is put forward. In each control cycle, the eight voltage vectors of three-phase grid-connected Inverters are calculated in prediction model. The voltage vector which makes the value function minimum is taken as the switching vector of the next cycle. Thus, d axis component and q axis component own independent control and tracked fast. By the non-phase locked loop strategy, the trigonometric function values of the grid could be directly calculating, which avoids the delay of phase detection of PLL. Simulation results show that the three-Phase Grid-Connected Inverters that take model Current Predictive Control without PLL as control strategy possess nice static performance and better dynamic performance.