摘要
本文提出一种适用于数字控制的内同步高精度锁相环方法。本方法实现简单,在系统正常工作情况下可以高精度跟踪电网同步信号。在失去电网同步信号后依然可以使系统按照原来的频率和相位继续稳定运行,更适用于需要在并网、离网自由切换工作的系统。本文首先详细分析了此处带内同步程序锁相环的工作原理,然后推导了采用这种锁相方法的具体精度,最后通过1kW样机实验验证了提出方法的正确性。
This paper proposes a simple high accuracy inner-synchronization phase locked loop method used for dig-ital control.This method is very easy to be realized.When the system works under normal condition,it could track the grid synchronized signal in high accuracy.When the system losses the grid synchronized signal,it could keep stable operation under the former frequency and phase position,and it is more suitable for the systems which need to switch between grid-tied and stand-alone mode.In this paper,the working principle of the phase locked loop with inner-synchronized program is analyzed at first.The accuracy using this phase locked loop method is derived.Finally,experimental results on a 1kW prototype prove the validity of the proposed method.
出处
《电工电能新技术》
CSCD
北大核心
2011年第2期75-78,共4页
Advanced Technology of Electrical Engineering and Energy
基金
上海海事大学研究生创新基金资助项目(yc2009101)
国家自然科学基金资助项目(50707017)
上海市教委重点学科资助项目(J50602)
关键词
数字控制
内同步
锁相环
同步信号
digital control
inner-synchronization
phase locked loop
synchronized signal
