Long-term coordination for hydro-thermal-wind-solar hybrid energy system of provincial power grid

Abstract

The uncertainty of inflow and uncontrollability of renewable energy generation pose great challenges on the scheduling and operations of power systems with large-scale hydropower and renewable power capacity. In this paper, a hydro-thermal-wind-solar hybrid energy system of provincial power grid is taken as the background. A practical method for long-term coordination for this system is proposed. Depending on different types of power plants, this method decomposes the original problem into four subproblems, i.e., wind sub-problem, solar sub-problem, thermal sub-problem and hydropower sub-problem. In the former three subproblems, the generation schedules of power plants are determined by statistical analysis method that is based on large amounts of actual operating data. For the hydropower sub-problem, all hydropower plants are first divided into three types relying on the operation characteristics and roles, and different strategies are adopted to schedule each type of hydropower plants. The results from a case study show that the proposed method can fully meet the power demands of power grid by effective coordination of hydro-thermal-wind-solar energy system.