Abstract
With the reduction of local synchronous generators in the receiving-grid, the risk of short-term voltage instability of the system under contingencies increases. During the system recovery process, the dynamic reactive power interaction between the large-capacity HVDCs and the AC grid cannot be ignored. Therefore, this paper theoretically analyzes the dynamic reactive power characteristics of HVDCs, induction motors and synchronous generators in detail. Through the comparative analysis, the critical recovery stage for short-term voltage stability is proposed. Furthermore, a short-term voltage stability optimization method based on HVDC recovery control is proposed. Besides, a quantitative indicator based on trajectory sensitivity is utilized to evaluate the influence of VDCOL parameters and provide a reference for optimization. Finally, the electromagnetic transient simulation based on PSCAD/EMTDC verifies the proposed dynamic reactive power recovery characteristics. After optimization, the short-term voltage stability of the system is significantly improved.
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