Abstract：For phase-lock problem under grid asymmetric fault,this papar proposes three-phase phase-locked-loop system based on model reference adaptive algorithm.Based on established dynamics model of three-phase voltage system,this papar designs state observer with self-adaptive frequency, derives frequency estimation adaptive rate by using the Lyapunov stability theory, and thus the system has a global stability. At the same time, through reasonable simplification,this papar designs key parameters of the adaptive system in order to meet the dynamic performance requirements. System achieves fast and accurate estimation of positive and negative sequence components under asymmetric conditions, so as to achieve the purpose of locking the grid voltage properties including positive sequence phase. As a result of the adaptive thinking,system has strong robustness for asymmetric mutation and uncertainty of frequency. Simulation and experiment results verify feasibility of the proposed methods.
裴喜平, 郝晓弘, 陈伟. 基于模型参考自适应算法的三相锁相环系统[J]. 电工技术学报, 2014, 29(4): 196-204.
Pei Xiping, Hao Xiaohong, Chen Wei. A Novel Three-Phase Phase-Locked-Loop System Based on Model Reference Adaptive Algorithm. Transactions of China Electrotechnical Society, 2014, 29(4): 196-204.
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