dq坐标系下开环测相算法的抗噪性能分析与改进研究  

Analysis and Improvement of Anti-noise Performance of Open-loop Phase Locking Algorithm in dq Frame

作　　者：王玮茹[1] 郑惠萍[1] 金健 张一帆 李明贤 WANG Weiru;ZHENG Huiping;JIN Jian;ZHANG Yifan;LI Mingxian(State Grid Shanxi Electric Power Research Institute,Taiyuan 030001,China;State Grid Shanxi Transmission Maintenance Company,Taiyuan 030021,China;College of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]国网山西电力科学研究院,山西太原030001 [2]国网山西电力输电检修分公司,山西太原030021 [3]中国矿业大学电气与动力工程学院,江苏徐州221116

出　　处：《智慧电力》2021年第11期81-88,共8页Smart Power

基　　金：国家重点研发计划资助项目(2017YFB0903100)。

摘　　要：为提高噪声干扰下电压信号同步相位的检测精度,更好地实现并网变流器的高性能控制,以dq旋转坐标系下开环测相算法(OPL-SRF)为研究对象,对其抗噪性能进行量化研究,揭示了高频噪声对电压测相精度的干扰机理及其影响规律。提出一种改进型开环测相算法,通过纠正dq坐标系的旋转角度,确保电压矢量与d轴夹角始终接近于0°,可有效增强开环测相算法的抗噪性能。所提改进算法可降低系统对滤波器的带宽要求,有助于减少锁相过程中的动态响应时间。仿真验证了抗噪性能分析内容的正确性和所提改进算法的有效性。The higher performance control of grid-connected converter is determined by improving the measurement accuracy of voltage phase under noise interference. The paper takes synchronous reference frame-based open-loop phase locking(OPL-SRF)in dq rotating frame as the research object to analyze quantitatively its anti-noise performance,introduces the interference mechanism and influence law of high frequency noise on voltage phase measurement accuracy,and proposes an enhanced OPL-SRF algorithm to improve the phase measuring accuracy under noise interference. The angle between voltage vector and the d-axis is always close to 0 by adjusting the rotation angle of dq synchronous reference frame. The improved algorithm can reduce the requirement for the filter bandwidth and shorten the dynamic response time in the process of phase-locking. The correctness of the anti-noise analysis and the effectiveness of the improved algorithm are verified by the real-time simulation.

关 键 词：开环锁相 噪声抑制 电压相位 旋转变换 

分 类 号：TM401[电气工程—电器]