计及信息不确定性的多端交直流混合配电网分布式二级协同控制  

Distributed Secondary Cooperative Control of Multiterminal AC/DC Hybrid Distribution Networks Considering Information Uncertainty

作　　者：杨挺 秦楠 李浩 刘亚闯 Yang Ting;Qin Nan;Li Hao;Liu Yachuang(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2024年第6期602-612,共11页Journal of Tianjin University：Science and Technology

基　　金：国家重点研发计划资助项目(2022YFB2403900);国家自然科学基金资助项目(U2066213);天津市自然科学基金重点资助项目(21JCZDJC00640).

摘　　要：分布式一致性控制(distributed consensus control,DCC)因其灵活协同能力成为交直流混合配电网二次控制的新途径.然而,传统DCC并未考虑实际通信环境中存在的随机时变时延和数据丢包问题,这致使其在非理想通信环境下难以稳定跟踪一致性期望目标.为此,本文提出一种计及信息不确定性的分布式二级协同控制策略.利用变量累加补偿机制,对时变时延和数据丢包进行统一等效.进而基于附加一致性算法(surplus consensus algorithm,SCA)构建具有零稳态误差特性的估计器,并对其收敛性进行推导证明.在此基础上,设计稳态收敛性能不受通信约束干扰的SCA-DCC控制器,实现非理想通信环境下的精准平均电压偏差调节和有功功率成比例分配.随后,以时延容忍度为指标优化SCA-DCC控制器参数,满足系统在不同通信条件下的稳定需求,进一步增强控制器的通信鲁棒性.仿真结果表明,在不同功率扰动和故障工况下,与现有控制策略相比,所提控制策略能够克服时变时延和数据丢包产生的负面影响,在维持较优动态响应性能的同时使稳态电压偏差降低73.08%~85.25%,具有控制精度高和抗扰动能力强的特点.Distributed consensus control(DCC)has emerged as a new approach for the secondary control of AC/DC hybrid distribution networks because of its flexible coordination capability.However,traditional DCC does not account for the random time-varying delay and data packet loss in the actual communication environment,making it difficult to achieve stable tracking of consistent desired goals in nonideal communication environments.Therefore,this paper proposes a distributed secondary cooperative control strategy considering information uncertainty.The unified equivalent of time-varying delay and data packet loss is achieved by the variable accumulation compensation mechanism.Furthermore,an estimator with zero steadystate error is constructed based on the surplus consensus algorithm(SCA),and its convergence is deduced and proved.On this basis,an SCA-DCC controller whose steady-state convergence performance is not disturbed by communication constraints is designed to realize accurate average voltage-deviation regulation and proportional distribution of active power in nonideal communication environments.Then,the parameters of the SCA-DCC controller are optimized with the time delay tolerance as the index to ensure system stability under various communication conditions and enhance the robustness of the controller.The simulation results show that the proposed control strategy can better overcome the negative effects of time-varying delays and data packet loss under conditions with various power disturbances and faults than existing control strategies.In addition,it not only reduces the steady-state voltage deviations by 73.08%-85.25% while maintaining better dynamic response performance but also has high control accuracy and robustness against disturbances.

关 键 词：多端交直流混合配电网 分布式控制 时变时延 数据丢包 附加一致性算法 

分 类 号：TM732[电气工程—电力系统及自动化]