摘要
从功率流向角度对已有低电压穿越(LVRT)方法进行归纳总结,在此基础上提出一种LVRT控制策略:基于机电储能,利用机侧变流器稳定直流母线电压,网侧变流器实现最大风能跟踪。该控制策略结合散热要求大大降低的制动电阻与变桨距调节技术,可以在不增加控制复杂度、不显著增加系统成本的情况下,充分利用风电机组惯性,存储电网电压跌落时系统的不平衡能量,平稳实现LVRT。通过对1.5MW永磁直驱风电系统的MATLAB仿真,验证了所提出的LVRT控制策略的正确性和有效性。
This paper summarizes the existing low voltage ride through（LVRT） methods from power flow prospective,and proposes a LVRT control strategy based on the electromechanical energy storage.The generator-side converter maintains DC-link voltage while the grid-side converter tracks the maximum power point of wind energy.This control strategy combines braking resistor with greatly reduced cooling requirements and variable-pitch structure technology,can make full use of the wind turbines＇ inertial characteristics to store the imbalanced energy and realize LVRT smoothly,without increasing control complexity and system costs significantly.The correctness and validity of this LVRT control strategy is verified through MATLAB simulation of a 1.5 MW permanent magnet synchronous generator（PMSG） wind generation system.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第7期17-21,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51177147)
浙江省重点科技创新团队项目(2010R50021)~~
关键词
永磁同步发电机
风力发电
电压跌落
低电压穿越
机电储能
制动电阻
permanent magnet synchronous generator（PMSG）
wind power
voltage sags
low voltage ride through（LVRT）
electromechanical energy storage
braking resistor
