Abstract
Grid-forming control can effectively improve the power transmission capacity and stability of the voltage source converter based high voltage direct current (VSC-HVDC) transmission system under the weak power grid condition. However, there was no related research on the mid- and high-frequency impedance characteristics and resonance stability of the VSC-HVDC system using grid-forming control. In this article, the mathematical model of positive and negative sequence impedance of VSC-HVDC system using grid-forming control was established. The influence of the control system parameters and the delay time of control system on the impedance characteristics was analyzed. It was found that the power-synchronization loop (PSL) has little effect on the impedance in the mid- and high-frequency bands, and the impedance amplitude has resonant peaks under certain conditions. Resonance suppression strategies under grid-forming control were proposed, including optimizing parameters of the control system, adding low-pass filters and reducing the delay time of control system. An electromagnetic transient simulation model of VSC-HVDC system under grid-forming control was built to verify the correctness of theoretical analysis.
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