A Novel Control Method of Single-Phase Photovoltaic Inverter

A compound control method taking reactive power compensation into account for single-phase photovoltaic(PV) inverter is proposed. According to the power balance principle of single-phase PV, the output third harmonic current of photovoltaic inverter can be corrected and eliminated by deducing the value of DC-side secondary ripple voltage. Based on the steady-state mathematical model of the single-phase inverter, the feed forward fundamental modulation signal of inverter can be calculated, and then the output current closed-loop control by using deadbeat controller is realized. As a result, the feed forward-feedback compound control method can achieve a fast and zero-error tracking of output current. The simulation results show that the compound control can effectively improve the dynamic performance of the single-phase PV inverter and perfect the power quality of the distribution grid.