考虑源荷功率交互的高光伏渗透率下电流谐波畸变抑制方法

Photovoltaic (PV) has become a new type of harmonic source due to its harmonic generation characteristics under both ideal and nonideal grid. The harmonic distortion becomes more serious due to an increase in PV penetration and the application of nonlinear loads. Furthermore, the research has found that the current total harmonic distortion (THD) trend behaves as an inverted “U” shape, and the harmonic mitigation method should be improved correspondingly to ensure that THD remains at a low level under complex power operating conditions. First, the relationship between harmonic percentage and PV penetration is modeled in this article. Second, a trapezoidal wave compensation method is proposed to suppress the harmonics of PV generated caused by the dead zone under an ideal grid. Third, a novel harmonic current feedback strategy is proposed to decrease the THD for the grid with significant background harmonics. Finally, comparative experiments are shown in a 10-kW PV converter experimental platform and a modified IEEE 33-bus distribution network (DN) model, and the simulation and experimental results prove the effectiveness and superiority of the proposed method.