ステップ注入付周波数フィードバック方式に起因する無効電力振動の継続条件

抄録

This paper focuses on the continuous oscillation of reactive power caused by the frequency feedback method in the grid-connected inverters. The transfer functions of inverter and ac system are derived. Then the stability of the system is analyzed according to the transfer functions. The analysis clarified that the system becomes unstable if the product of line impedance, inverter capacity, and frequency feedback characteristic exceeds a specific threshold value. Then it results in the continuous oscillation of reactive power.