并网逆变器的对称锁相环与功率控制环

The stability of a grid-connected inverter (GCI) under weak grid can be assessed by checking whether the return ratio matrix satisfies the generalized Nyquist criterion. Due to the inherent asymmetry of the phase-locked loop (PLL) and power control loop (PCL), the eigenvalues of the return ratio matrix are complex, imposing challenges in stability analysis and parameter design of the PLL and PCL. ...