摘要
随着风电场规模越来越大,传统的集中式控制、无功比例分配方式难以保证风电场运行的经济性和安全性,为此提出一种风电场内部分散式无功电压优化控制策略,风电场以分散式方式运行,以减小集电线路损耗和均衡机组机端电压为目标协调机组无功出力。首先,基于Distflow潮流模型将优化控制目标建立成一个最优问题。然后,利用基于交替方向乘子法(alternating direction multiplier method,ADMM)的分散式优化算法,将原优化问题分解为若干子问题,通过相邻风机控制器间的信息交互,以分散式方式迭代求解。最后,在MATLAB和PSCAD中验证了所提出分散式优化控制策略的控制效果。结果表明:风电场内部分散式无功电压优化控制能够减轻风电场总站控制器通信负担,使风电场在满足上级无功需求指令的同时能够减小内部损耗,改善馈线电压分布,助力风电场经济、安全稳定运行。
With the increasing scale of wind farm,traditional centralized control and reactive power proportional distribution methods are difficult to ensure the economy and safety of wind farm operation.For this reason,this paper proposes a distributed optimal control strategy of reactive power and voltage in wind farm.The wind farm operates in a distributed manner to coordinate the reactive power output of the generators with the goal of reducing the loss of the collection line and balancing the terminal voltage of the generators.First,the control objective is established as an optimal problem based on the Distflow power flow model.Then,the distributed optimization algorithm based on the alternating direction multiplier method(ADMM)is used to decompose the original optimization problem into several sub-problems,which are solved iteratively in a distributed manner through the information interaction between adjacent wind turbine controllers.Finally,the control effect of the proposed distributed optimal control strategy is verified in MATLAB and PSCAD.The results show that the distributed optimal control strategy of reactive power and voltage can reduce the communication burden of the wind farm terminal controller,thus the internal loss of the wind farm can be reduced and the feeder voltage distribution can be improved while meeting the reactive power demand commands,promoting the economic,safe and stable operation of the wind farm.
作者
王渝红
廖逸犇
宋雨妍
曾琦
郑宗生
WANG Yuhong;LIAO Yiben;SONG Yuyan;ZENG Qi;ZHENG Zongsheng(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第12期5047-5056,共10页
High Voltage Engineering
基金
国家电网公司总部科技项目(4000-202055048A-0-0-00)。
关键词
风电场
分散式控制
集电线路损耗
机组电压均衡性
交替方向乘子法
wind farm
distributed control
loss of the collection line
equalization of the generator terminal voltage
alternative direction multiplier method
