摘要
风电场参与调频时会增加风机的疲劳载荷,导致风电场维护成本上升、运营效益下降。为此,提出一种考虑疲劳载荷的风电场分散式频率响应策略,可在维持风电场调频性能的同时,降低风机疲劳损伤。为实现该目标,首先分析风电场调频及有功控制结构,推导风机线性动力学模型,并构建考虑疲劳载荷的单机频率响应模型。然后基于Jensen尾流模型,推导风电场由尾流波动产生疲劳载荷的解析式,并结合单机模型构建风电场频率响应模型。为减少风电场中央控制器计算压力,采用目标级联分析法将原集中式优化问题拆分成主问题(中央控制器)和多个子问题(本地控制器),建立分散式频率响应策略。最后在MATLAB/Simulink中搭建含80台单机容量为5 MW双馈风机的IEEE RTS-79系统,并通过仿真验证所提策略的有效性。
The fatigue load of wind turbines increase when wind farms participate in power system frequency regulation,which leads to the increase of maintenance cost and decrease of operation benefit of wind farm.Therefore,a decentralized frequency response strategy for wind farm considering fatigue load is proposed,which can effectively reduce the fatigue damage of wind turbines while maintaining the frequency regulation performance for wind farm.To achieve this objection,firstly the structure of frequency regulation and active power control for wind farm are analyzed.The linear dynamic model of wind turbine is derived,and the single-unit frequency response model with load is constructed.Then,the analytic expression of fatigue load caused by wake flow fluctuation is derived based on Jensen’s wake flow model,which makes the singleunit model extend the frequency response model of wind farm.To reduce the computational pressure of the central controller,a method of analytical target cascading is applied to form a decentralized frequency response strategy,which divides the centralized optimization model into the main problem(central controller)and seve-ral sub-problems(local controllers).Finally,the IEEE RTS-79 system is built in MATLAB/Simulink,which contains 80 doubly-fed wind turbines with single unit capacity of 5 MW,and the effectiveness of the proposed strategy is verified by simulation.
作者
杨伟峰
文云峰
李立
王康
迟方德
张武其
YANG Weifeng;WEN Yunfeng;LI Li;WANG Kang;CHI Fangde;ZHANG Wuqi(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Dispatch and Control Center of State Grid Shaanxi Electric Power Corporation,Xi’an 710049,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2022年第4期55-62,共8页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(52077066)
湖南省自然科学优秀青年基金资助项目(2020JJ3011)
国网陕西省电力公司新能源消纳科技专项(SGSN0000TKJS2001710)。
关键词
风电场调频
风机
目标级联分析法
疲劳载荷
尾流效应
frequency regulation for wind farm
wind turbines
analytical target cascading
fatigue load
wake effect
