永磁电机低电压穿越的协调控制策略研究
摘要:电网中风电比例占比较高时，风电系统如果出现大面积脱网，将会对电网造成严重影响。通过分析同步直驱永磁风力发电机组(permanent magnetic synchronous generator，PMSG)故障的运行特性，为能够提高PMSG的低电压运行能力，依据现有的保护策略，提出一种新的低电压穿越(low-voltage ride through，LVRT)协调控制策略，包括将卸荷电路的直流制动系统控制、双二阶广义积分锁相控制、提取电网电压正负序以及网侧无功控制的综合协调控制策略。以电网中常见的三相对称跌落故障及单项接地短路造成的不对称故障，通过PASCAD仿真实验来验证风力机组低电压穿越能力，分析结果表明：所提出的综合协调控制策略可实现风电机组在低电压故障期间的安全穿越，提高了系统稳定性与实用性，验证了新型的低电压穿越控制策略的有效性和优越性。
Abstract：In the power grid with high proportion of wind power, large-scale disconnection of wind power system during voltage sags will have a serious impact on the grid. Based on the analysis of the operation characteristics of the fault of direct-drive permanent magnetic synchronous generator (PMSG) and the existing protection strategies, in order to improve the low-voltage operation capability of PMSG, a new coordinated control strategy for low-voltage ride through (LVRT) is proposed, which includes DC brake system control of unloading circuit, double second-order generalized integral phase-locked control, extracting positive and negative sequence of grid voltage and reactive power control on grid side. Based on the common three-phase symmetrical drop fault and asymmetrical fault caused by single grounding short circuit in power grid, PASCAD simulation experiment is conducted to verify the LVRT ability of wind turbine. The simulation results show that the proposed control strategy can realize the safe passage of wind turbines during low voltage fault and improve the stability and practicability of the system, which verifies the effectiveness and superiority of the new LVRT control strategy.
标题：永磁电机低电压穿越的协调控制策略研究
title:PMSG Low Voltage Ride Through Based on Coordinated Control Strategy
作者：张召鹏
authors:ZHANG Zhaopeng
关键词：直驱风电机组,电网故障,低电压穿越(LVRT),协调控制,仿真分析,
keywords:direct driven wind turbine,grid fault,low-voltage ride through (LVRT),coordination control,simulation analysis,
发表日期：2019-07-01
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