计及混合多馈入直流等效短路比约束的源网协同规划方法OA

As the scale of high-voltage direct current(HVDC)expands,the short-circuit ratio of the receiving-end power system gradually approaches or exceeds its critical value,which may easily trigger DC commutation failures and other issues,thereby endangering the stable operation of the power system.Coordinated planning of source and grid can effectively improve system stability by rationally deploying power sources and lines.To address this problem,this paper proposes a source-grid coordinated planning method considering the hybrid multi-infeed DC equivalent short-circuit ratio(ESCR)constraints.First,the explicit expression of the critical equivalent short-circuit ratio(CESCR)is derived based on the coupling relationship between nodal voltage sensitivity factors with respect to active and reactive power and the CESCR,and an ESCR constraint model is established.Second,by coupling the source-grid coordinated planning model,the evaluation model of short-circuit ratio,and the generation model of short-circuit ratio constraint cut,a coordinated planning model of source and grid with adaptive ESCR adjustment capability is developed.Verification results on the IEEE 24-bus test system and a practical regional power system demonstrate that CESCR can accurately quantify the voltage support capability of hybrid multi-infeed DC.The short-circuit ratio level of the receiver-end system can be elevated by optimizing the network topology,while the coordinated planning scheme of source and grid can optimize power output of generating units and reduce system operating costs.