计及调频死区的柔性风储联合频率控制策略  

Flexible Frequency Regulation Scheme of DFIG embed Battery Energy Storage System Considering Deadbands

作　　者：杨德健 王鑫[1] 严干贵[1] 金恩淑 金朝阳 Yang Dejian;Wang Xin;Yan Gangui;Jin Enshu;Jin Zhaoyang(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education Northeast Electric Power University,Jilin 132012 China;Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University,Jinan 250061 China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林132012 [2]电网智能化调度与控制教育部重点实验室(山东大学),济南250061

出　　处：《电工技术学报》2023年第17期4646-4656,共11页Transactions of China Electrotechnical Society

基　　金：东北电力大学博士科研启动基金资助项目(BSJXM-2021209)。

摘　　要：针对风电机组与储能系统频繁参与电力系统调频带来的机械疲劳及循环使用寿命的问题,提出一种计及调频死区的柔性风储联合频率控制策略。首先,构建含风储调频死区的系统频率响应模型,明晰调频死区变化对电网频率的动态影响;其次,通过人工设置调频死区,确定风储系统调频动作时机及限制其调频深度,将受扰系统的频率响应阶段分为无响应区、风机响应区、风储过渡区和储能响应区,同时风机在考虑有效旋转动能的基础上参与调频,平抑电网频率波动;然后,通过设置风储过渡区可有效缓解风机退出调频带来的机械疲劳问题,储能装置在荷电状态约束的条件下参与调频,遏制电网频率突变;最后,利用大扰动激励法,在连续变动风速场景下验证了所提策略的有效性。Doubly-fed induction generator(DFIG)can take part in system frequency regulation(SFR)by releasing its kinetic energy of rotor,but the available kinetic energy is limited.DFIG excessive involvement in SFR would lead to the reduction of wind energy utilization,the sudden increase of mechanical stress,and even the instability of DFIG;as a high quality source of frequency regulation,energy storage system(ESS)has the advantages of fast throughput power and flexible control capability,but the frequently charging and discharging of ESS accelerates its electrical aging and reduces its service life.Aiming at issues of the mechanical stress and service life of DFIG and ESS,this paper addresses a flexible frequency regulation scheme of DFIG-embed ESSs based on the artificial deadbands.Firstly,this paper established a frequency response model taking into account the frequency deadbands regulation of the DFIG-embed ESS,and further analyzed the influences of the artificial deadbands on the system frequency dynamics;secondly,the artificial deadbands was used to ensure the activation and limit the depth of the frequency regulation of the DFIG-embed ESS,the frequency response process of the disturbed system was divided into:no response band,response band of DFIG,transaction band of DFIG and ESS,and response band of ESS.DFIG participates in SFR to mitigate the grid frequency fluctuations considering the rotational kinetic energy available from the DFIG,the issues of mechanical stress caused by sudden power change of the DFIG is alleviated during transaction band of DFIG and ESS;ESS provides SFR function to arrest the grid frequency variation taking into account the condition of state-of-charge constraints.Finally,power system model with various wind power penetrations and disturbances was modeled based on an EMTP-RV to investigate the effectiveness of the proposed a flexible SFE scheme of DFIG-embed battery energy storage system.Simulation results on the different SFR schemes illustrate that,in the case of only fluctuating wind sp

关 键 词：调频死区 风储系统 频率控制 电力系统控制 高比例风电联网 

分 类 号：TM614[电气工程—电力系统及自动化]