Design of Ancillary Damping Controller of Grid-Forming VSC-HVDC Systems

doi:10.3969/j.issn.1008-0198.2024.02.009

Abstract

Abstract: Voltage source converter based high voltage direct current system can provide inertia support to the receiving-end power systems. However,it also inherits the oscillatory characteristics of synchronous generator,which makes the system dynamics more complex.This paper establishes the state-space model and transfer function models of a grid-forming VSC-HVDC system connected with a receiving-end power system,which are utilized to reveal the system oscillatory characteristics under the disturbance.Ancillary damping controllers are designed to improve the damping performance of the grid-forming VSC-HVDC systems,which only requires the state variables of the grid-forming VSC-HVDC systems.The test system is built in DIgSILENT/PowerFactory to verify the performance of the proposed control strategy.The results show that the proposed control strategy can effectively dampen the dc voltage oscillation and the electromechanical oscillations in AC grids.

Key words: VSC-HVDC, grid-forming control, oscillatory characteristic, ancillary damping controller

CLC Number:

TM721.1

WANG Canlin, ZHANG De, ZHU Sirui, LI Yong, WANG Weiyu, WEN Ding. Design of Ancillary Damping Controller of Grid-Forming VSC-HVDC Systems[J]. Hunan Electric Power, 2024, 44(2): 68-76.

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