中文说明：这是同步的基准帧的锁相环（SRF-PLL）的平衡的输入条件下的模型。从仿真结果，可以发现，SRF-PLL使相位角和频率的一个快速，准确的估计。
English Description：
This is the model of synchronous reference frame phase-locked loop (SRF-PLL) under balance input condition. From the simulation result, it can be found that the SRF-PLL gives a fast and accurate estimation of phase angle and frequency.