三相不平衡条件下基于可变采样周期的锁相环研究

摘要

A PLL method based on variable sampling period was proposed under voltage unbalancing and harmonics. In order to eliminate disturbances caused by the negative sequence voltage and the harmonics, a filter based on the Sliding Gortzel Transform was used in the method. Simulation with frequency steps, unbalances and harmonics was given to verify the method.%针对三相电网不平衡和畸变时传统的三相锁相环锁相精度差等问题,研究了一种基于采样周期变化的锁相环技术（VSP_PLL）,并通过滑动Gortzel滤波器滤除负序和谐波电压造成的扰动,从而消除电压不平衡的影响,很好地完成锁相。在三相电压不平衡、电压畸变、频率突变情况下进行了仿真研究,结果验证了所用锁相环的正确性和有效性。