The inertia evaluation of power systems can help identify weak areas of inertia and provide important guidance for improving the frequency support capability of power systems after disturbances. Therefore, a practical inertia evaluation method for power systems based on measurement data is proposed. Firstly, the inertia response process of power systems based on the rotor motion equation is briefly analyzed, and then the applicability of existing wide area monitoring systems under different operation conditions based on the inertia response transfer function is presented. Secondly, a method for calculating system inertia and damping coefficients based on the least squares method and a principle for determining the stability of inertia response are proposed, which solved the problem of complex parameter identification and unknown stability in traditional methods. Furthermore, a method for calculating the maximum similarity between predicted and measured frequency deviation values based on Pearson correlation coefficient is put forward, achieving the selection of the optimal data window for inertia evaluation. Finally, simulation testing and field data testing verifies the effectiveness and reliability of the proposed method. Compared with existing methods, the inertia identification accuracy of the proposed method is higher, and it can be used for inertia evaluation in practical power systems.
XU Sudi, WANG Chenqing, KONG Xiangping, GAO Lei, YUAN Yubo, BIN Zijun
. Practical Inertia Evaluation Method for Power System Based
on Measurement Data[J]. Journal of Shanghai Jiaotong University, 0
: 1
.
DOI: 10.16183/j.cnki.jsjtu.2025.200
