基于dq变换的三相软件锁相环设计  

Three-phase software phase-locked loop based on dq reference frame

作　　者：吉正华[1] 韦芬卿[2] 杨海英[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏南京210061 [2]国网电力科学研究院,江苏南京210003

出　　处：《电力自动化设备》2011年第4期104-107,共4页Electric Power Automation Equipment

基　　金：国家电网公司科研项目资助(SG0833)~~

摘　　要：针对传统锁相环在电压畸变条件下不能获得准确相位的问题,根据软件锁相环(SPLL)原理,提出了一种基于dq坐标变换原理获得SPLL线性化模型,并通过PI控制实现的新型三相SPLL。在三相电压不平衡时,利用T/4(T为三相电压周期)延时计算法实现正、负序分量分离,有效地抑制负序分量对相位的影响。通过仿真实验系统,对提出的控制策略在各种电压畸变及三相电压不平衡条件下进行验证,结果表明,该SPLL的动态响应速度快、稳态性能好,并对电压畸变有很强的抑制作用。As the traditional PLL（Phase-Locked Loop） can not obtain accurate phases under distorted voltage,a linear model of SPLL（Software Phase-Locked Loop） based on dq coordinate transform theory is proposed and a new three-phase SPLL is achieved by PI control. When the three-phase voltage is unbalanced,the T/4 shift method is used to separate the positive and negative sequence components,which effectively inhibits the influence of negative sequence component on phase calculation. The proposed control strategy is simulated with the experimental system for different voltage distortions and unbalanced three-phase voltages. Results show that the presented SPLL greatly suppresses the voltage distortion,with fast dynamic response and good steady performance.

关 键 词：软件锁相环 dq坐标变换 畸变电压 正、负序分量 

分 类 号：TP214[自动化与计算机技术—检测技术与自动化装置]