Research On Multi-Agent System's Application In Power System

Nowadays, innovation of electric power industry and interconnecting network make power system engineers pay more attention to protection relay system. Cooperation and collaboration of system become more and more important. In addition, with the development of renewable technology, renewable hybrid power systems are growing rapidly because of their cleanness. Because of the random changing of wind power, solar energy and load, the application of hybrid power system is very difficult. Therefore, this dissertation focuses on designing a energy management system of the hybrid power system, which can control electric devices effectively, so as to meet the requirement of load and keep the balance between power supply and demand and then keep the stabilization of the electrical network. As the chief dissertation, a new scheme of protection relay of transmission and energy management of hybrid system based on multi-agent system (MAS) theory is proposed and studied systematically. The main contents of this dissertation are as follows:The dissertation firstly generalizes an overview of the history and current status of the research on protection relay and energy management of hybrid system. At the same time, it summarizes the theories and techniques of MAS and their applications to fields of protection and power system. The purpose and significance of the projects is also introduced.A hybrid agent structure is proposed based on the characteristic of transmission protection. The function of each element is introduced in detail. Because short corresponding time is required, the reactive module is designed as a RBF network. Then it can react rapidly to faults within the protection area. Simulation results show this scheme is able to satisfy the demand of protection relay.A transmission protection relay system based on multi-agent is proposed. The configuration, operating mechanism and decision-making process of the transmission protection system are described in detail. In the proposed protection scheme, protection unit of each circuit-breaker is represented as an execution agent, who works either independently or coordinately to fulfill the transmission protection. The simulation results on the test systems are presented to illustrate the validity of the proposed scheme.Chapter 5 of this paper concerns with cooperation and optimization of the MAS-based energy management of hybrid power system. The energy management agent's structure and the whole system's configuration are proposed. Broadcast and contract net are introduced to realize coordination and cooperation among management agents. A particle swarm optimization search algorithm is presented and applied to find the optimal control sequence for abnormal voltage control of DC bus.At the end of this dissertation, main results of the research are summarized and the further studies are prospected.