电力系统保护与控制Issue(15)：135-141,7.
一种利于DSP实现的改进型电网电压软锁相环的研究
Research of an improved soft phase-locked loop for grid voltage which is easier to implement on the DSP
赵瑞杰 1田素立 1代兴华 1刘德林1
作者信息
- 1. 许继集团有限公司，河南 许昌 461000
- 折叠
摘要
Abstract
Soft phase-locked loop (SPLL) gets more and more applications in the field of modern industrial control, especially in grid voltage phase locking. This paper analyzes the basic structure and working principle of the SPLL and designs an improved grid SPLL according to the shortcomings of traditional SPLL which has large amount of computations and is difficult to achieve on the chip of digital signal processor (DSP). On one hand, the control algorithm is simplified based on the locked nature of the phase angle by reverse thinking. And these builds on the very understanding of the relationship of three-phase voltage coordinate transformation. On the other hand, the PI parameters are calculated dynamically (not the constant PI parameters) which makes phase locking function work dynamically and the control algorithm is more simple. The theoretical analysis and simulation analysis show that the modified SPLL is simple, possesses better performance in dynamic phase tracking, harmonic suppression and detection of unbalanced voltage, etc. , can deal with fault such as power down, and is very appropriate to implement on the DSP.关键词
电网相位/软锁相环/矢量坐标变换/动态PI参数/三相电压不平衡/谐波抑制/电网连接设备Key words
grid phase/phase-locked loop (SPLL)/voltage vector coordinate transformation/dynamic PI parameters/three-phase voltage imbalance/harmonic suppression/grid connection equipment分类
信息技术与安全科学引用本文复制引用
赵瑞杰,田素立,代兴华,刘德林..一种利于DSP实现的改进型电网电压软锁相环的研究[J].电力系统保护与控制,2013,(15):135-141,7.
