Combined Source-Storage-Transmission Planning Considering the Comprehensive Incomes of Energy Storage System

An energy storage system transfers power and energy in both time and space dimensions and is considered as critical technique support to realize high permeability of renewable energy in future power systems. It contributes to the achievement of China's long-term carbon emission abatement targets. However, the promotion and application of energy storage are severely restricted due to the high construction cost of energy storage systems and lack of effective compensation mechanisms for peak-regulating ancillary service. In this study, a source-storage-transmission joint planning method is proposed considering the comprehensive incomes of energy storage. The comprehensive income of the energy storage system is divided in detail from the planning level, and the accounting method of energy storage income is proposed. Based on the load fluctuating trend under the condition of the connecting wind power grid, the dynamic electricity pricing methods of power trisection and time trisection are introduced to achieve the dual goals of direct income from energy storage and improving system flexibility. To comprehensively consider the direct income of peak-valley arbitrage and indirect income of energy storage configuration, a coordinated planning model of source-storage-transmission is constructed and tested in the Garver-6 system using the measured data from one province grid in China. The results verify the effectiveness of the proposed methods and show improvements in cost recovery and system flexibility.