Day-ahead Generation Scheduling Method for New Energy and Hydro Power System

Abstract

When the stochastic and fluctuant new energy integrates to the power system, it increases conventional units’ burden. On the other hand, some conventional units are replaced by new energy units, which lead to the decline in peak load regulation ability. In order to make full use of the water storage capacity of hydropower to improve system’s peak load regulation ability, this paper proposes a method of optimizing the day-ahead generation scheduling based on the coordinated operation of new energy and hydropower. This method comprehensively considers the constraints of hydro-plants generation constraints, power balance, unit output, new energy output prediction, and can prepare unit combinations and output plans. In the objective function, new energy accommodation is given greater weight. This will implicitly achieve the goal of the first priority of accommodating new energy and the second priority of accommodating hydropower, which can reduce the start-stopping of thermal power units and is particularly suitable for power systems with high start-up costs and high operating costs of thermal power units. The example results show that the method can make full use of hydropower and new energy to regulate peak load, which can not only promote accommodation of new energy and guarantee the safety of power safety, but also ensure the stability of thermal power plants operation and increase the economic efficiency of power system.