基于双dq变换正负序提取及锁相环的FPGA实现  

Realization of Positive & Negative Sequence Component Picking up and Phase Locked Loop Using FPGA Based on Dual-dq Transform

作　　者：张树楠 罗海云 程晓绚 雷妮 刘争艳 ZHANG Shunan;LUO Haiyun;CHENG Xiaoxuan;LEI Ni;LIU Zhengyan(Xi'an XD Power System Co.Ltd.,Xi'an 710065,China)

机构地区：[1]西安西电电力系统有限公司,西安710065

出　　处：《高压电器》2020年第3期182-189,共8页High Voltage Apparatus

摘　　要：对于并网型电能质量治理设备,如有源电力滤波器(APF),为了实现对电能质量的检测与治理功能,需要对三相电压基波的正负序进行快速准确提取。当电网电压发生不对称、畸变等情况时,能否快速准确获得基波电压的频率和相位信息将会大大影响电能质量治理设备运行性能。文中依据同步旋转坐标变换理论,采用双dq变换方法,通过低通滤波器(LPF)处理,实现对基波电压的正负序提取,在此基础上引入负反馈控制理论实现锁相环功能。依据此理论使用FPGA实现基波电压正负序提取及锁相环功能,经测试表明文中所设计的系统能够在三相电压出现不对称、畸变等情况时,快速准确实现基波电压正负序提取、以及基波频率和相位的锁定,能够满足有源电力滤波器对于电压频率、相位实时检测与设备控制保护的使用需求。As to grid-connected power quality improvement equipment,such as active power filter(APF),in order to deal with power quality detection and control,it is necessary to pick up the three-phase fundamental voltage positive & negative sequence component accurately and rapidly.When voltage asymmetry and distortion arising in a.c.network,the ability obtaining the fundamental voltage frequency and phase information quickly and accurately will great affect the power quality improvement equipment performance.In this paper,the fundamental voltage positive& negative sequence component are picked up by according to the theory of synchronous rotating reference frame transformation,using dual-dq transform method,and through the low pass filter(LPF) processing.The phase locked loop function is realized by using negative feedback control theory.Based on the method mentioned above,the fundamental voltage positive & negativee sequence component picking up and Phase Locked Loop function are realized by using FPGA.The results of verification test show that the method mentioned in this paper could pick up the fundamental voltage positive & negative sequence component and obtain the information of fundamental voltage frequency and phase when the a.c.network rising voltage asymmetry and distortion,etc.The method can meet the requirements of active power filter for voltage frequency and phase real-time detection,and control & protection.

关 键 词：双dq变换 对称分量法 正负序提取 锁相环 FPGA VIRTEX-6 有源电力滤波器(APF) 

分 类 号：TM711[电气工程—电力系统及自动化]