用于并网逆变器阻抗测量的串联电压注入变换器双向功率平衡控制

Serial voltage injection (SVI) converter is widely used in frequency-scan for the impedance measurement of the grid-connected inverter. The dc power supply is necessary for the SVI converter, which reduces device power density and cost performance. Meanwhile, the fundamental voltage variation brought by the varying operating capacity of the inverter and the voltage drop on the grid impedance decre...