1.State Key Laboratory of HVDC (Electric Power Research Institute of China Southern Power Grid Company Limited), Guangzhou 510663, China;2.School of Electric Power, South China University of Technology, Guangzhou 510641, China;3.China Southern Power Grid Company Limited, Guangzhou 510623, China

The controller parameters of high voltage direct current (HVDC) transmission systems have an important influence on the system stability and dynamic response performance. This paper proposes a controller parameter setting method for the line commutated converter based high voltage direct current (LCC-HVDC) system based on the D-partition method. Firstly, based on the operation parameters of an actual project, an equivalent small-signal dynamic model of the LCC-HVDC system in the single-pole full-voltage operation mode is established. Then the transfer functions of constant current control and constant voltage control loops are obtained based on the Laplace transform of the model. The D-partition method is used to set the proportional-integral (PI) parameters of the constant current controller and the constant voltage controller, and obtain the controller parameter setting domain that meets the requirements of gain margin, phase margin and bandwidth limitation at the same time. The parameter setting domains at different power transmission levels are superimposed to obtain the multi-condition general controller parameter domain. The simulation results verify the accuracy of the small-signal dynamic model and the effectiveness of the proposed controller parameter setting method.