考虑频率安全的新能源场站多路径改造与多类型电源协同规划方法OA

[Objective]To address the decline in primary frequency response capability and the resulting threats to frequency security caused by the high-proportion integration of renewable energy,a coordinated planning method for multi-path retrofitting of renewable energy plants and multi-type generation considering frequency security is proposed.[Methods]First,a multi-path retrofit model for renewable energy plants was constructed,including the installation of primary frequency response controllers(PFRCs),grid-following(GFL)energy storage,and grid-forming(GFM)energy storage,so as to characterize the differences among various retrofitting pathways in terms of primary frequency regulation,inertia response,and investment costs.Second,a coordinated planning model was established with the objective of minimizing the total sum of generation investment cost,renewable energy plant retrofit cost,and operational cost.To overcome the difficulty of embedding highly nonlinear frequency deviation constraints into the planning model,an iterative master-subproblem solution framework was developed.The master problem solved the multi-scenario-based generation expansion and renewable energy retrofit decisions,while the subproblem used a system frequency response model to evaluate frequency security indicators.The master and subproblems were linked through physics-informed strengthening cuts derived from three dimensions:regulation power,frequency regulation reserve capacity,and system inertia.[Results]The verification results on the modified IEEE 24-bus system and an actual regional power system demonstrate that the proposed method can obtain the optimal construction scheme while fully exploiting the complementary advantages of diversified renewable energy retrofit pathways.Compared with the conventional planning method,the total cost was reduced by 1.2%,and the renewable energy accommodation rate was increased by 0.4%.Furthermore,as the penetration rate of renewable energy capacity further increases,the system rotational inertia decreases,leading to a significant increase in the configured capacity of GFM energy storage.[Conclusions]The proposed method can effectively coordinate system frequency support performance and overall economic cost,avoid over-investment in conventional coal-fired thermal power plants,and provide a practical and feasible solution to the decline in primary frequency response capability caused by the high-proportion integration of renewable energy.