双dq变换软件锁相环的数学模型研究  

Study of Model of Software Phase Locked-Loop Based on Dual-dq Synchronous Transform

作　　者：王颢雄[1] 马伟明[2] 肖飞[1,2] 陈明亮[2] 刘勇[2] 

机构地区：[1]浙江大学电气工程学院,杭州310027 [2]海军工程大学电力电子技术研究所,武汉430033

出　　处：《电工技术学报》2011年第7期237-241,共5页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金创新研究群体项目(50721063);国家自然科学基金资助项目(50737004)

摘　　要：对于三相并网型PWM变换器,要求锁相环能够准确、快速地检测出电网在不对称、畸变等情况下的基波频率与相位等信息,为控制系统及时提供准确的相关信息。本文根据双dq变换软件锁相环(SPLL)的基本原理,分析、推导了三相电源基波正、负序分量与锁相角和实际电压相位之间的数学关系,建立了基于该数学关系的双dq变换SPLL模型。仿真和实验均表明该模型适用性强,能够快速有效地提取三相电源在三相不对称、三相畸变、三相不对称且畸变等情况下的基波频率、正负序分量的大小与相位。As to power-connected three-phase PWM converter,some important information of unbalanced grid such as frequency and phase of fundamental wave which are used in control system should be exactly and quickly detected by phase locked-loop.According to basic principle of dual-dq synchronous transform,the paper analyzes and deduces the math relation between fundamental positive-sequence component and fundamental negative-sequence components and difference of angle computed by phase locked-loop and actual phase,and built the model of SPLL based on the math relation.The results of simulation and experiment indicate that the model can quickly and effectively obtain frequency,magnitude and phase of fundamental positive-sequence component and fundamental negative-sequence component of unbalanced and distortion grid.

关 键 词：双dq变换 对称分量法 三相不平衡 软件锁相环 

分 类 号：TM46[电气工程—电器]