Research on No-affected Photovoltaic Grid-Connected Inverter by the Inductance Value

Abstract

In order to solve the low adaptability problem of the common-mode voltage of the existing Non-isolated Photovoltaic Grid-Connected Inverter with H6-type (NPGCI-H6) is affected by the inductance matching factors and causes a large common-mode leakage current. Based on the idea of the parallel bypass switch on grid-connected filter inductor, this article put forward a no-affected photovoltaic grid-connected inverter by the inductance value (NPGCI-IV) circuit that is not affected by the inductance value matching and analyzed its operating modes and control methods. At the same time, this article designed a hysteresis current controller which is suitable for NPGCI-IV. Finally, the article studied the proposed photovoltaic grid-connected inverter circuit that is not affected by inductance matching and its control methods. The results showed the correctness of the proposed circuit and its control methods.