摘要
微网中高比例风力、光伏发电的输出功率具有随机性、波动性,同时负荷功率具有随机时变性,这些特性易引起微网中频率波动。微网运行方式的改变,将导致网络等值参数和运行参数的变化。针对交直流混合微网中频率波动及控制对象参数摄动的问题,提出了一种基于H∞混合灵敏度的交直流混合微网频率控制方法,控制交流区域频率并使之保持稳定。通过将实际控制问题转换为混合灵敏度问题,构建S/R/T函数,设计了频率鲁棒控制器,增强了频率对参数摄动的鲁棒性。通过将鲁棒控制问题转换为用Riccati方程表示,利用线性矩阵不等式方法求解该方程得到H∞频率控制器。最后,通过MATLAB/Simulink仿真平台,验证了所设计频率控制方法的正确性和可行性。
The output power of high-penetration wind power and photovoltaic generation in microgrid is random and fluctuating.Meanwhile, the load power in microgrid is stochastic and varying, which easily causes frequency fluctuations in the microgrid.Moreover, the operation mode change of the microgrid will cause in variations in both network equivalent parameters and operation parameters. Consequently, aiming at frequency fluctuations and parameter perturbation of controlled objects in AC/DC hybrid microgrid, this paper proposes a frequency control method for the AC/DC hybrid microgrid based on H∞ mixed sensitivity, which can control and stabilize the AC-region frequency. Firstly, the S/R/T function is constructed by converting a practical problem into a mixed sensitivity problem. Secondly, a frequency-robust controller is designed, which enhances the robustness of the frequency at parameter perturbation. Besides, the Riccati equation is introduced to describe the robust control problem. This equation is solved by linear matrix inequality method to obtain the H∞frequency controller. Finally, the correctness and feasibility of the designed frequency control method are verified by MATLAB/Simulink simulation platform.
作者
李鹏
马显
李雨薇
陈博
方晴
LI Peng;MA Xian;LI Yuwei;CHEN Bo;FANG Qing(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;State Grid Beijing Electric Economics Research Institute,Beijing 100055,China)
出处
《电力系统自动化》
EI
CSCD
北大核心
2020年第2期132-138,共7页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目（51577068）
国家重点研发计划资助项目（2017YFB0903300）~~
