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.
出处
《电网技术》
EI
CSCD
北大核心
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)~~
