采用自适应在线模型辨识的微电网二次调频策略  

Secondary Frequency Regulation Strategy for Microgrid Adopting Adaptive Online Model Identification

作　　者：杨向真[1,2] 杨秋强 杜燕 施永[1,2] YANG Xiangzhen;YANG Qiuqiang;DU Yan;SHI Yong(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Research Center for Photovoltaic System Engineering of Ministry of Education,Hefei 230009,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009 [2]教育部光伏系统工程研究中心,安徽省合肥市230009

出　　处：《电力系统自动化》2021年第20期121-130,共10页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51907045);安徽省自然科学基金资助项目(1908085QE238)。

摘　　要：各种模型未知的商业变流器的接入、供电及负荷设备的频繁投切以及网络结构的变化导致微电网系统模型具有不确定性和时变性的特点。针对基于传统比例-积分控制和采用参数化预测模型的模型预测控制等微电网二次调频策略存在的系统机理建模复杂、在线更新困难、定阶非机理建模难以适应全工况建模需求以及参数化预测模型求解复杂等问题,提出了基于自适应在线模型辨识的动态矩阵控制(DMC)二次调频策略。该策略由两部分构成:第1部分为自适应模型辨识,该部分将赤池信息准则模型阶次寻优方法和遗忘因子递推最小二乘法结合起来,实现对微电网等值最优模型的辨识;在第2部分DMC二次频率调节策略中,利用已获取的微电网等值最优模型来实时更新DMC二次调频算法的预测模型,通过滚动优化控制快速恢复系统频率。最后,在MATLAB/Simulink仿真平台搭建微电网仿真算例,验证了所提辨识方法和频率控制策略的正确性和有效性。Due to the access of commercial converters with various unknown models,the frequent switching of power supply and load equipment,and the changes in network structure,the microgrid system model has the characteristics of uncertainty and timevarying.The secondary frequency regulation for microgrid based on traditional proportional-integral(PI)control and model predictive control with parameterized prediction model has the problems such as the complexity of system mechanism modeling,the difficulty in online updating,the difficulty in fixed-order non-mechanical modeling to meet the modeling requirements of full working conditions and the complexity of solving the parameterized prediction model.In order to solve the above problems,a secondary frequency regulation strategy with dynamic matrix control(DMC)based on adaptive online model identification is proposed.The strategy consists of two parts.The first part is the adaptive model identification which combines the order optimization method based on Akaike information criterion(AIC)and the forgetting factor recursive least squares method to realize the optimal equivalent model identification of the microgrid.In the second part,the secondary frequency regulation strategy with DMC uses the obtained optimal equivalent model of the microgrid to update the predictive model of the DMC second frequency regulation algorithm in real time,and quickly recovers the system frequency through rolling optimization control.Finally,a simulation example of the microgrid built on the MATLAB/Simulink platform shows the correctness and effectiveness of the proposed identification method and the frequency control strategy.

关 键 词：微电网 赤池信息准则 最优模型 动态矩阵控制 二次调频 

分 类 号：TM73[电气工程—电力系统及自动化]