摘要
提出一种适用于通过VSC-HVDC系统并网风电场的低电压穿越协调控制策略。建立高压直流输电线路和风电场的模型,分析电网故障期间系统的工作原理。低电压穿越期间,通过HVDC两端变流站提供无功支持,并采用基于电压控制的快速功率降低算法控制风电场馈入功率,维持直流系统功率平衡;对风电机组功率控制进行改进,提出分层控制与HVDC控制相协调,保持风电机组的电压稳定。算例仿真结果验证了该控制策略的快速性和有效性。
A coordinated control strategy is proposed for the LVRT（Low Voltage Ride Through）of wind farm with grid-connecting VSC-HVDC.The models for HVDC line and wind farm are built and the working principle of system during grid fault is analyzed.The converters at both sides of HVDC provide reactive power during LVRT and the fast power reduction based on voltage control is adopted to control the in-feed power of wind farm for the power balance of DC system.The hierarchical control is coordinated with the HVDC control to improve the power control of wind turbine for its voltage stability.The simulative results of case study verify the quickness and effectiveness of the proposed control strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2014年第3期138-143,共6页
Electric Power Automation Equipment
基金
国家高技术研究发展计划(863计划)项目(2011AA-05A107)
国家自然科学基金资助项目(51177015
51077068)
江苏省产学研前瞻性联合研究项目(BY2010142)
江苏教育厅自然科学基金资助项目(12KJB470006)~~
