Abstract：As to power-connected three-phase PWM converter, some important information of unbalanced grid such as frequency and phase of fundamental wave which are used in control system should be exactly and quickly detected by phase locked-loop. According to basic principle of dual-dq synchronous transform, the paper analyzes and deduces the math relation between fundamental positive-sequence component and fundamental negative-sequence components and difference of angle computed by phase locked-loop and actual phase, and built the model of SPLL based on the math relation. The results of simulation and experiment indicate that the model can quickly and effectively obtain frequency, magnitude and phase of fundamental positive-sequence component and fundamental negative-sequence component of unbalanced and distortion grid.
王颢雄, 马伟明, 肖飞, 陈明亮, 刘勇. 双dq变换软件锁相环的数学模型研究[J]. 电工技术学报, 2011, 26(7): 237-241.
Wang Haoxiong, Ma Weiming, Xiao Fei, Chen Minliang, Liu Yong. Study of Model of Software Phase Locked-Loop Based on Dual-dq Synchronous Transform. Transactions of China Electrotechnical Society, 2011, 26(7): 237-241.
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2011, Vol. 26 
