一种频率自适应的同步相位与对称分量检测方法  

A method of frequency adaptive detecting for synchronous phase and instantaneous symmetrical components

作　　者：陈海荣[1] 刘子坚[1] 屠卿瑞[2] 

机构地区：[1]金华职业技术学院,浙江金华321017 [2]浙江大学,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2012年第3期297-302,共6页Journal of Zhejiang University（Science Edition）

摘　　要：电网不对称故障时,快速、准确地检测同步相位和对称分量是电力电子装置实现控制与保护的关键问题之一.分析了负序分量对传统三相锁相环检测性能的影响,设计了一种频率自适应的同步相位与瞬时对称分量检测新方法.该方法利用瞬时对称分量理论在两相静止坐标系下实现对称分量的实时检测,利用广义二阶积分器实现90°相移,用测得的基波正序电压q轴分量作为锁相环的输入,用锁相环的输出角频率作为相移电路的谐振角频率,达到谐波抑制与频率自适应跟踪,是一个闭环的实时检测系统.分析了该方法的实现机理,给出了检测电路的实现框图,进行了实验验证.结果表明,该方法既能在被测电压不对称时准确检测同步相位和对称分量,又能消除电压频率变化对检测同步相位和对称分量的影响.Under AC power system fault conditions,detecting synchronous phase and instantaneous symmetrical components quickly and accurately is an important part of the control and protection system of power electronic equipment.In this paper,the influence of negative sequence voltage components on the PLL's detecting performance is studied,a novel method based on frequency adaptive for detecting instantaneous symmetrical components is proposed.In this method,the theory of instantaneous symmetrical components in α-β frame for detecting symmetrical components is adopted,the phase shift method of 90° based on second order generalized integrator is realized.q axis component of the fundamental positive voltage is used as input of the PLL and the angular frequency of PLL is used as resonant frequency of the circuit of phase shift.In this paper,implementation mechanism of the proposed method is analyzed.Block diagram of the detecting circuit is given and is also verified by experimental research.Experimental results show that the proposed method not only can detect instantaneous symmetrical components accurately under unbalanced source voltage but also can eliminate the influence of frequency diversification on detecting instantaneous symmetrical components.

关 键 词：电力电子 锁相环 瞬时对称分量 广义二阶积分器 谐振频率 

分 类 号：O29[理学—应用数学]