A Market-Oriented Tie-Line Deviation Assessment Model for Regional Power Grids with High Renewable Energy Penetration

Abstract

With the large-scale integration of renewable energy and the increasing level of inter-provincial electricity market coordination, the scale and volatility of inter-provincial tie-line power exchanges have grown significantly. Based on monthly Area Control Error (ACE) operational data from four provincial control areas within a regional power grid, this paper analyzes the characteristics of ACE and identifies the limitations of the existing tie-line assessment mechanism with respect to price incentives, market integration, and responsibility allocation. To address these issues, a market-oriented tie-line assessment model under the unified collection and distribution framework is proposed. The proposed mechanism converts deviation energy into economic costs and develops both two responsibility-based cost allocation schemes and one contribution-based reward distribution scheme, thereby achieving economic constraints on inter-provincial tie-line deviations and incentive guidance for frequency regulation resources. Case studies show that the proposed method can effectively quantify provincial tie-line deviation responsibility, encourage market participants to reduce deviations for lower assessment costs, and improve the quality of frequency regulation services to obtain greater rewards, thereby providing a reference for market-oriented reform of the tie-line assessment model.