考虑频率和电压支撑强度的水风光综合基地直流外送能力评估OA

Large-scale hydro-wind-solar integrated power bases exhibit the fundamental characteristics of multi-energy sources,weak grid structure,and limited local loads.Thus the transmission export capability of its large-scale clean energy through HVDC connection is severely subject to system security and stability.With regards to the issue of frequency/voltage support capabilities weakened by high penetration of renewable energy,this paper develops an HVDC transmission capability evaluation model incorporating frequency and voltage support strength.Firstly,a coordinated assessment framework is established based on the analysis of the constraints limiting HVDC transmission capabilities.Next,by integrating spatio-temporal hydraulic-electric constraints of river basin cascade hydropower generation and considering complementary operation of hydro-wind-PV energy resources,a transmission capacity optimization model with the objective of maximizing delivery power is formulated via mixed-integer second-order cone programming method.Finally,security constraint frameworks covering frequency/voltage support requirements are constructed by quantifying system frequency response capability and short-circuit ratios of multiple renewable plants.Furthermore,by taking advantage of second-order cone reconstruction techniques to efficiently process nonlinear frequency constraints,a transmission capacity evaluation methodology is then formulated which balances the multi-energy complementarity and system security require-ments.Case studies on modified IEEE benchmark systems are conducted to validate the model's effectiveness through multi-scenario simulations.