光伏电站附加阻尼控制器及控制参数优化设计  

Optimal design of additional damping controller and control parameters for photovoltaic power station

作　　者：艾松波 唐欣[1] 王红亚 AI Songbo;TANG Xin;WANG Hongya(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China;Maintenance branch,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,China;Training Center,State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 330000,China)

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410114 [2]国网江西省电力有限公司检修分公司,江西南昌330000 [3]国网江西省电力有限公司培训中心,江西南昌330000

出　　处：《电力科学与技术学报》2020年第6期21-27,共7页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(51577014)。

摘　　要：随着光伏发电的发展,大规模光伏电站并网对电力系统稳定性影响日益显著。光伏并网逆变器引入阻尼控制有助于增大电力系统的阻尼,然而阻尼控制参数太大会引起新振荡模式。在此背景下,建立光伏电站接入单机无穷大系统的小信号模型,分析光伏电站并网对系统阻尼的影响,并设计光伏并网有功附加阻尼控制器,从理论上分析附加阻尼控制器对系统阻尼的贡献。此外,基于系统根轨迹阐明附加阻尼控制系数过大影响系统稳定性的机理,进而给出系统最大阻尼时控制参数的计算方法。最后,采用PSCAD软件进行仿真,验证理论分析与计算的正确性。With the development of photovoltaic power generation,large-scale photovoltaic plants grid-connection has a significant impact on power system stability.A damping control introduced in photovoltaic grid-connected inverters helps to increase the damping of the power system.However,too large a damping control parameter causes a new oscillation mode.Under this background,a small-signal model is established for photovoltaic plants connected to a single-machine infinite bus system to analyze the influence of photovoltaic plants grid-connection on system damping and design active power additional damping controller for the photovoltaic grid-connection.Furthermore,the contribution of the additional damping controller is theoretically analyzed to the system damping,and the system root locus is utilized to clarify the mechanism of oversize additional damping control coefficient affecting the system stability.And then,the computation method of the control parameters is proposed when the system is at the maximum damping.Finally,the correctness of the theoretical analysis is verified by the simulation on PSCAD software.

关 键 词：光伏电站 低频振荡 附加阻尼控制 小信号模型 单机无穷大系统 

分 类 号：TM863[电气工程—高电压与绝缘技术]