Research on Robust Control Strategies for VSC-HVDC

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhu, Kaicheng^1 ; Bao, Hai^1

School of Electrical and Electronic Engineering, North China Electric Power University, Beijing

102206, China^1

关键词: Active and Reactive Power;    External disturbances;    Mixed sensitivity optimization;    Model uncertainties;    Parameter perturbation;    Proportional integral controllers;    Robust control toolbox;    Second-order systemss;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/5/052077/pdf
DOI  :  10.1088/1755-1315/108/5/052077

来源: IOP

【 摘 要 】

In the control system of VSC-HVDC, the phase locked loop provides phase signals to voltage vector control and trigger pulses to generate the required reference phase. The PLL is a typical second-order system. When the system is in unstable state, it will oscillate, make the trigger angle shift, produce harmonic, and make active power and reactive power coupled. Thus, considering the external disturbances introduced by the PLL in VSC-HVDC control system, the parameter perturbations of the controller and the model uncertainties, a H∞robust controller of mixed sensitivity optimization problem is designed by using the Hinf function provided by the robust control toolbox. Then, compare it with the proportional integral controller through the MATLAB simulation experiment. By contrast, when the H∞robust controller is added, active and reactive power of the converter station can track the change of reference values more accurately and quickly, and reduce overshoot. When the step change of active and reactive power occurs, mutual influence is reduced and better independent regulation is achieved.