Research Of Hydrothermal Power Systems Energy-Saving Dispatch Modeland Optimization Method

Electric power industry is energy-intensive industry. The energy efficiency improvement, change of energy utilization mode, and reduction of carbon-based energy use of electric power industry plays an important role in alleviating the contradiction between supply and demand of energy and improving the ecological environment. Theory and practice indicated that priority use of clean and renewable energy and making cleaning power and thermal power combined operation is an effective way to make the power system economic operation, improve energy utilization efficiency and save non-renewable energy. At present, hydroelectric energy is in dominant among clean and renewable energy in China. Hydrothermal power system combined operation is an effective way to enhance the energy utilization efficiency of power systems, promote the adjustment of energy utilization mode. The rational coordination of hydrothermal power system operation mode which can make the best use of the complementary advantages of power systems can promote power system energy-saving operation.Tightly focusing on combined optimization dispatch problems for hydrothermal power system with cascade hydroelectric plants which have complex spatiotemporal coupling characteristics, this paper has made deep research on several aspects of power system energy-saving operation theory, single objective and multi-objective energy-saving dispatch model and its optimization method for the purpose of water resources reasonable utilization and coal and non renewable energy conservation.The whole thesis consists of6chapters, each chapter of main contents can be summarized as follows:Chapter1introduction:A brief review has been given for current research status of the domestic and international power system optimization dispatch theory and our country energy-saving dispatch theory. The paper’s main contents were put forward based on the combined operation problems faced by hydrothermal power systems with cascade hydroelectric plants and the requirements of electric power industry energy-saving dispatch mechanism.Chapter2hydrothermal power systems energy-saving operation theoretical analysis: Hydroelectric plant and thermal plant operation characteristics and interactive characteristics of hydrothermal power system are prerequisite and foundation for constructing rational optimization scheduling models, making optimal hydroelectric plants water plan and thermal plants power generation plan. This chapter has made a detailed analysis for spatiotemporal coupling characteristics, mutual affective law, restrict characteristics and water spillage characteristic of cascade hydroelectric plants. A detailed hydro-electric conversion mathematical model was put forward to analyze the characteristics of reservoir characteristic influence. Thermal plant operation characteristics have been analyzed. The interaction rules of hydrothermal power systems has been revealed by using mathematical analysis methods. At last, some energy-saving measures for hydrothermal power systems were proposed to make the power systems operate economically.Chapter3Electromagnetism-like mechanism (ELM):Swarm intelligence algorithms in solving nonlinear optimization problem have outstanding advantage. A novel swarm intelligence algorithm named Electromagnetism-like mechanism was studied in this chapter. By through analyzing algorithm theoretical basis, optimization principle and general theoretical framework, some factors affecting the algorithm’s optimization performance were revealed. The enhanced Electromagnetism-like mechanism with single direction force were put forward for solving large-scale optimization problems effectively. Global convergence of the algorithm provides theoretical basis for solving power system energy-saving dispatch model.Chapter4hydrothermal power systems single objective energy-saving dispatch and optimization method:The coordination condition and dynamic water spillage mathematical model for hydroelectric plants were constructed. A novel single objective energy-saving dispatch model of hydrothermal power systems has been put forward based on dynamic water discharge limits. To solve the model effectively, a hybrid swarm intelligence algorithms with genetic operators and Electromagnetism-like mechanism was applied in solving the single objective energy-saving model.Chapter5hydrothermal power systems multi-objective energy-saving dispatch and optimization method:A novel multi objective energy-saving dispatch model for hydrothermal power systems was established which can realize the coordination of water, environment, energy saving and so on. To solve the multi-objective dispatch model effectively, a hybrid multi-objective method with Electromagnetism-like mechanism and data envelopment analysis was put forward which without considering the characteristics of the objective function. At the same time, the method can reduce the multiple goal decision making under blindness by through bi-criterion with optimization objective and comprehensive benefits.The sixth chapter summarizes the main work of full text and achievements of the dissertation. Finally, the future research contents have been put forward.