Power Grid Parameters Determining Based on Extended Sensitivity Matrix in Electricity Market

With the continuous advancement of the electric power reform, regional power grids have gradually developed into an interconnected form with high complexities. To reduce the complexity of the large-scale power grid and simplify the analysis and calculation, an equivalent network with simplified critical information that can effectively simulate the original grid is required in the operation of electricity market. To this end, this paper proposes a method for extracting the critical parameters of large-scale power grid based on an improved power transmission distribution factor (PTDF) matrix. The developed improved PTDF matrix is easy to be calculated and can be directly used as the network parameter of the equivalent model. In the case study, the proposed method is first illustrated on the IEEE 14-nodes test system. Then, the proposed method is leveraged to extract the critical parameters for Shanghai Power Grid based on the field BPA data. Four metrics including the locational marginal price (LMP), active power outputs of generators, reserved node voltage phase angles, and the power flow of reserved lines are testified on both the equivalent networked and original network. The results demonstrate that the proposed improved PTDF matrix-based parameters extraction method can well reflect the operating conditions of the system under normal conditions while also applicable for congestions.