直驱风机变流控制系统对次同步频率分量的响应机理研究  

Study on Response Characteristics of Grid Converter Control System of Permanent Magnet Synchronous Generators(PMSG) to Subsynchronous Frequency Component

作　　者：李景一 毕天姝 于钊 张鹏 肖仕武 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国家电力调度控制中心,北京市西城区100031

出　　处：《电网技术》2017年第6期1734-1740,共7页Power System Technology

基　　金：国家自然科学基金项目(51627811);高等学校学科创新引智计划项目(B08013);国家电网公司科技项目(SGXJ0000KXJS1500669)~~

摘　　要：在概述变流控制系统锁相环和d/q解耦控制环节传递函数的基础上,采用小信号方法,依次推出当控制系统各环节馈入1个次同步频率分量时输出信号的解析表达式,讨论信号经变流控制系统后频率变化关系,对比分析多个输出次/超同步频率信号的相对幅值关系。进一步以时域仿真及我国某新能源汇集地区PMU(phasor measurement unit)实测数据,分别验证理论分析的正确性。同时根据理论分析,对永磁直驱风机汇集母线存在多个次/超同步频率分量的现象给出解释,也对抑制主要次/超同步频率分量提供依据。In this paper, transfer functions for PLL （phase-locked loop） and d/q decoupling control system are presented respectively. With small signal method, for the case when a subsynchronous frequency component is fed into PLL and d/q decoupling control system as input signal, expressions of output signals are derived. Frequency transformation relationship between input and output signals and amplitudes of multiple output components of sub- and super-synchronous frequency are then discussed in detail. Simulation results and practical wave recording data from PMU（phasor measurement unit） validate theoretical analysis. With the theoretical analysis, existence of multiple sub- and super-synchronous frequency components in PMSG collecting bus is explained, and the basis of suppression of main subsynchronous frequency components are given.

关 键 词：次同步振荡 永磁直驱风机 网侧变流控制系统 锁相环 d/q解耦控制环节 

分 类 号：TM614[电气工程—电力系统及自动化]