单相电力信号同步相位的快速捕获方法研究  

Research on Fast Phase Synchronization in Single-phase Power Systems

作　　者：熊连松[1] 卓放[1] 祝明华[1] 刘小康[1] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049

出　　处：《中国电机工程学报》2015年第9期2209-2216,共8页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2012AA050206)~~

摘　　要：快速准确地获取同步相位是变流器控制的基本要求。针对传统单相锁相环在动态响应速度与应对谐波污染等方面存在的不足,提出基于旋转坐标变换的单相电力信号同步相位快速开环捕获方法,可同时应对幅值、相位、频率的突变。首先通过三角函数运算推导出一种准确的虚拟正交信号生成的方法,从而提高同步旋转坐标系下锁相方法的精确度。并基于此提出旋转坐标系下快速准确计算实时相位的开环锁相方法,该方法无需相位差闭环自调节过程,从而显著地提高了相位捕获的实时性。最后,通过借用DSC方法成功地解决谐波致锁相不准的问题。各种工况下的实验结果同时表明:提出的方法可在电网环境恶劣的条件下实现快速准确地捕获单相电力信号的同步相位,具有较强的鲁棒性。The prompt and accurate phase detection is an essential qualification for the control of power converters. Aiming at the shortcomings of the traditional single-phase PLL such as long response time and inability to operate properly under distorted utility conditions, a novel fast synchronization method is provided based on Park transformation, which is capable of processing utility network signals containing sudden, simultaneous changes of the amplitude, phase and frequency, as well as eliminating phase errors due to harmonics by adopting the Delayed Signal Cancellation （DSC） scheme. An accurate generation method of imaginary orthogonal signals based on mathematical deduction is introduced first, and then the accuracy of phase synchronization is improved in the rotating coordinate system. A real-time open-loop phase synchronization method is further proposed, which requires no self-tuning closed-loop control process and therefore significantly enhances the real-time performance. Finally, the DSC method is utilized to effectively suppress the phase errors due to harmonics. Experiments under different operating conditions validated the proposed ptaase synchronization method and its fast and accurate qualities, as well as the adaptive performance even in harsh utility environments.

关 键 词：开环锁相 虚拟正交信号 旋转变换 谐波抑制 

分 类 号：TM935[电气工程—电力电子与电力传动]