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Research On The Application Of Multi Agent System In Microgrid Coordination Control

Posted on:2010-06-05Degree:MasterType:Thesis
Country:ChinaCandidate:J ZhangFull Text:PDF
GTID:2132360278962981Subject:Power system and its automation
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Consisting of loads and micro sources, Microgrid, operates as a single controllable system that provides both power and heat to its local area safely and efficiently. Its internal energy resources are transmitted by high technology power electronic devices, which require considerable operational control capabilities. Microgrid has three main characteristics: Firstly, it contains various clean and efficient energy resources, and reduces the air pollution as well as promotes the economic growth. Secondly, energy management system is introduced in Microgrid to regulate power flow and provide considerable control of it. Thirdly, Microgrid can not only be operated efficiently in its own distribution network, but also be capable of islanding operation when it is required or there are some faults in upstream network. Due to its excellent potentials, such as low network loss, less carbon emission, flexible and efficient operation, Microgrid is expected to play a significant role in future electricity supply. However, with its distributed characteristics and considerable control capabilities over the network operation, Microgrid can hardly be controlled under traditional control systems which are designed to handle large production units operating under central control scheme. Thus, if we can change the control mechanisms from centralized type to distributed type, the problem can be solved effectively. Therefore, based on distributed control strategy, a Multi Agent System (MAS) is presented.MAS, which contains several agents, appears to be a very useful tool for operation and control of power systems. It has several characteristics: Firstly, the agent, the essential element in MAS, has a high level of autonomy that means each agent has the capability of control over its unit operation independently by its actions. Secondly, complex coordination control issues can be solved effectively by exchanging information with agents. Thirdly, each agent in MAS has a certain behavior and tends to satisfy certain objectives by using its services, that means MAS can provides optimal control strategies with corresponding unit.Therefore, based on these merits, a Multi Agent-based control framework, including main grid agents, Microgrid agents and component level agents, is originally presented in the paper. And then the issues of how to realize the Agent control and how to improve the coordination control strategies are disscused.Since each micro-generator has different characteristics, its corresponding model, including generating characteristics and paralleling characteristics, is established. Based on these models, the corresponding Agent control of each generator is introduced.Thereafter, an agent control model aiming at maximum efficiency of Microgrd is introduced, under the premise of Microgrd's voltage stability and power balance. Accordingly, the special functions and control strategies of each agent are discussed in details. Finally, a simulation example of a particular Microgrid is performed to demonstrate the effectiveness of MAS.Refer to energy markets, Microgrid, with its great potential, is becoming an important part of future electricity markets. However, traditional bidding modes, after Microgrid participating in energy markets, becoming more difficult to adapt to the requirement of distributed bidding. Thus, in order to improve the efficiency and reliability level of electricity markets, Multi Agent-based optimization bidding strategies are presented. Then, a Multi Agent bidding System is established, including main grid market agents, middle level agents (include generation company agents and MGS agents) and component level agents. Thereafter, aiming at maximum profit of Microgrid, profit maximization mode among middle lever agents and cost minimization mode among component level agents are presented. Accordingly, special functions and bidding strategies of each agent are discussed in details. Finally, two different simulation examples are performed to demonstrate the effectiveness of strategies.Thanks to its capability of flexible energy control, Microgrid, may give some supports to improve main grid power quality when it connecting to upstream grid. For example, to participate in distribution network voltage stability control, to participate in harmonic suppression, to reduce the network loss, and so on. Therefore, the specific supports in technique and hardware aspects were presented. At last, a simulation example is performed to demonstrate that the stability and economy of main grid can be improved by adding Microgrid.At the end of this dissertation, main results of the research are summarized and the further studies are prospected.
Keywords/Search Tags:power systems, multi agent, Microgrids, distributed generation, coordination control
PDF Full Text Request
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