An improved optimal control strategy for hybrid AC/DC power system

2018 International Conference on New Energy and Future Energy System

Gao, C.H.^1 ; Liu, W.M.^1 ; Zheng, T.T.^1 ; Liu, Z.W.^2 ; Miao, S.H.^2 ; Kang, Y.L.^2 ; Fan, Z.H.^2 ; Liu, Y.L.^2 ; Zhang, M.M.^1

State Grid East Inner Mongolia Electric Power Company Limited Electric Power Research Institute, Hohhot

010020, China^1

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Hubei Electric Power Security and High Efficiency Key Laboratory, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan

430074, China^2

关键词: Adaptive control methods;    Disturbance attenuation;    High voltage direct current;    Improved control scheme;    Inverse optimal adaptive control;    Inverse-optimal control;    Optimal control strategy;    System dynamic performance;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/188/1/012093/pdf
DOI  :  10.1088/1755-1315/188/1/012093

来源: IOP

【 摘 要 】

The additional modulation function of high voltage direct current (HVDC) links can improve the system stability while the unavoidable random external disturbance and sudden changes seriously affect the controller performance and the system stability. In this paper, an improved control scheme based on inverse optimal adaptive control is proposed for the hybrid AC/DC system which considers the system parameter error, external disturbance and other random perturbation. The proposed control scheme combines the inverse optimal control approach and the adaptive control method to account for the modelling errors and uncertainty, which aims at the disturbance attenuation and the optimal operating of the hybrid AC/DC power system. Besides, the improved PI (Proportional-Integral) controller based on the lead-lag link for the current control of HVDC system is proposed to further improve system dynamic performance. Simulations conducted on a typical hybrid AC/DC system show the correctness and validity of the proposed control method.