摘要
针对传统锁相环(PLL)在电压不平衡和畸变时动态较差的不足,提出一种基于二阶广义积分器的改进型PLL模型,通过提取正序电压分量,消除电压不平衡的影响,并具有较强的谐波抑制能力。基于此PLL提出一种新型预同步控制策略,实现对电网相位的追踪与同步,从而有效避免了并网过程的冲击电流。仿真和实验结果验证了该控制策略的有效性和可行性。
Aiming at the disadvantages of the traditional phase-locked loop （PLL） under unbalanced and distorted grid voltage, the improved PLL based on second-order generalized integrator is put forward to extract the phase of positive sequence component and eliminate the effect of unbalance voltage, and suppress the influence of harmonics on phase detection.Based on this PLL,a novel pre-synchronization control strategy is proposed.It can realize the synchronization with the grid voltage,thus avoiding the current abruption when being connected to the grid.Simulation and experimen- tal results verify the effectiveness and feasibility of the proposed control strategy.
出处
《电力电子技术》
CSCD
北大核心
2013年第11期25-26,32,共3页
Power Electronics
关键词
锁相环
正序分量
二阶广义积分器
预同步
phase-locked loop
positive sequence component
second-order generalized integrator
pre-synchronization
