Research on Multi-Dimensional Evaluation Index System of High Proportion New Energy Power Grid Operation

The increasing proportion of new energy access intensifies the volatility and uncertainty of the power grid., thereby creating a greater demand for grid flexibility., which significantly impacts the safe and stable operation of the power grid. Studying the operational characteristics of the power grid under high proportions of new energy access can provide guidance to ensure reliable power supply., promote consumption., and maintain safe and stable operations. To address this issue., this paper proposes a multidimensional evaluation index system for high-proportion new energy power grid operation. Firstly., it analyzes the adverse effects of a high proportion of new energy access on power grid operation from multiple time scales. Secondly., it presents a framework for a multidimensional evaluation index system based on time scale and establishes a multidimensional analysis model for high-proportion new energy systems that includes four indices: multi-time scale volatility., confidence level., multi-time scale complementarity., and peak load characteristics. Finally., using actual operational data from provincial power grids as an example., quantitative analysis is conducted on the operational characteristics under different time scales (hours., weeks months., and years) with significant levels of new energy access. The results demonstrate that the proposed evaluation system can quantitatively reflect the impact of large-scale integration of new energy sources on power grid operations from various perspectives.