基于改进锁相环的柔性直流输电系统控制研究  

Study on controlling of VSC-HVDC based on advanced phase locked loop technique

作　　者：郑连清[1] 池俊锋[1] 陈杰 

机构地区：[1]重庆大学电气工程学院,重庆400030 [2]重庆机场集团有限公司,重庆401120

出　　处：《华北电力大学学报（自然科学版）》2011年第2期15-20,共6页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50777066)

摘　　要：针对系统频率波动、开关器件动作产生大量的谐波等问题,快速、准确地提供同步相位,是基于电压源型换流器的高压直流输电系统实现控制和保护的关键问题。通过引进软件锁相环概念(SPLL),并结合VSC-HVDC系统能瞬间实现有功、无功解耦的特点,设计了双鉴相器的三相锁相系统。通过消除二倍频,抑制了引起误差的主要因素,同时使PI调节器具有更好的频率锁定和响应特性。通过PSCAD对改进前后系统的在消除谐波、提高系统整体性能,以及电网频率一定范围内突变时系统的响应特性等方面进行比较,实现了对原理的验证。Under AC power system frequency excursion and harmonics produced by switching devices,detecting synchronous phase and instantaneous symmetrical components quickly and accurately is an important part of the control and protection system of voltage source converter based high-voltage direct current transmission（VSC-HVDC）.Combined with the conception of SPLL and the VSC-HVD system,which can make the independence decoupling of the active power and the reactive power,devising a new system for three-phase phase-locked loop,with double-phase discriminators.According to eliminate the double frequency,reducing the system＇s main error,and at same time,making PI regulator has better frequency response characteristics and better frequency locking ability.It is verified by PSCAD that dynamic response of the system can be improved and locking frequency range of phase can be extended.

关 键 词：电压源型高压直流输电 电能质量 软件锁相环 PSCAD 

分 类 号：TM464[电气工程—电器] TM615