Stabilization of Constant Power Loads in DC Microgrid Systems Using an Adaptive Continuous Control Set Model Predictive Control

Symmetry

Mustafa Alrayah Hassan¹  Mingxuan Hou²  Jiaxuan Zhang³  Shang Wu⁴  Gaoqi Xing⁵  Jiyao Zhou⁶  Song Chi⁶ 

[1] Department of Electrical Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 807618, Taiwan;Korqin District Power Supply Branch, East Inner Mongolia Electric Power Co., Ltd., States Grid, Tongliao 028000, China;State Grid International Development Co., Ltd., Beijing 100031, China;State Grid Jibei Electric Power Co., Ltd., States Grid, Beijing 102488, China;State Grid Zibo Power Supply Co., Zibo 255000, China;State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China;

关键词: constant power load;    parallel DC-DC buck converters;    DC microgrid;    continuous control set model predictive control (CCS-MPC);   

DOI  :  10.3390/sym13071112

来源: DOAJ

【 摘 要 】

This paper represents an adaptive continuous control set model predictive control (CCS-MPC) to solve the disturbance-caused instability problems in a DC microgrid consisting of symmetrical parallel buck converters, constant voltage loads (CVL), and constant power loads (CPL). The symmetric model of the system is founded at first to describe and analyze the disturbance-caused instability problem. To mitigate the instability by taking the disturbances into consideration, the proposed adaptive controller is made from a double loop feedback controller and a feedforward estimation algorithm. In the voltage loop of the double loop controller, a capacitor dynamic-based voltage controller is developed, while in the current loop, a CCS-MPC algorithm is modified and applied. Meanwhile, a feedforward algorithm is developed to estimate the disturbance information and send it to the double loop controller to improve its robustness, so the composite controller can maintain the bus voltage fixed at its reference and the symmetrical equal current sharing. Finally, comparative MATLAB simulations and OPAL-RT hardware-in-the-loop experiments are conducted to verify the effectiveness and dynamic performance of the proposed algorithm towards other previous nonlinear controllers.

【 授权许可】

Unknown