摘要
传统软件锁相方式结构简单但适应性差,难以应对电网电压相位和频率突变情况。为解决该问题,在正负序双旋转坐标系的基础上给出解耦控制模型,并提出频率前馈的锁相方式。利用前馈环节消除频率扰动,锁相环反馈控制器只用来调节相位差。通过PSCAD软件给出仿真对比,并在DSP28335与XC3S400联合控制平台上进行了实验。结果证明该方法具有优越的动态和稳态性能,在各种电压畸变的情况下均能达到精确锁相的目的。
The traditional software PLL strategy is simple but is difficult to adapt the mutations of phase and frequency of the grid voltage.To solve this problem,a decoupling control model based on the positive and negative sequence double-rotating coordinate system is constructed,and the frequency feed-forward loop is proposed.With this method,frequency disturbance can be eliminated by frequency feed-forward loop and the PLL feedback controller is only for regulating the phase error.Simulations are carried out by PSCAD and corresponding experiments are established by using DSP28335 and XC3S400.The results prove that this method has excellent dynamic and steady performance and can achieve precise phase lock on different occasions of voltage distortion.
出处
《控制工程》
CSCD
北大核心
2016年第5期734-739,共6页
Control Engineering of China
基金
工业节电与电能质量控制协同创新中心开放课题基金资助(KFKT201407)
关键词
锁相环
正序
负序
解耦
频率前馈
Phase-lock loop
positive sequence
negative sequence
decoupling
frequency feed-forward
