Scheduling Strategies for the Thermal-hydro Coordination Based on the Large System Theory in Electricity Market

Abstract

In the electricity market, the first problem considered by the power grid company is the safety and economy of power grid. So, the power grid company must not only ensure the power grid safety but also consider the effects of power transaction and the thermal-hydro coordination in the daily scheduling strategies. Thus, it is necessary to carry out the economic predicting dispatch between the competitive volumes and the contract volumes of the thermal power plants and hydropower plants. Aiming at this goal, in this paper the thermal-hydro coordination economical scheduling model is established for the next transaction day under the electricity market environment. At the same time, the decomposition method based on the large-scale system coordination theory is used to solve the economical model for the needing of real-time dispatching. And then, the simplify solving methods are used for the sub economical model of the thermal power plants and hydropower plants. At last, the IEEE 30 bus simulation proves these scheduling strategies are correct, simple and practical, credible and able to satisfy the daily economical scheduling demand for the large-scale power grid in the electricity market. Keywords-Large-scale system coordination, Electricity market, Thermal-hydro coordination scheduling, Linear programming, DC power flow