一种增强弱电网下变换器稳定性的新型锁相环结构

The phase-locked loop (PLL) is widely used to synchronize the converters with the grid. However, the asymmetric dynamic characteristics of the PLL may cause frequency coupling effects and even cause sub/supersynchronous oscillation in weak grids. This article analyzes the frequency coupling effects of the conventional dual second-order generalized integrator PLL. A novel PLL structure is proposed ...