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Optimization And Coordination Of Power In Distributed Generation System Based On Colored Petri Nets

Posted on:2013-10-19Degree:MasterType:Thesis
Country:ChinaCandidate:L Q WuFull Text:PDF
GTID:2272330371981164Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
As distributed power generation was flexible, decentralized, small size, close to the users, and reasonably used clean energy, it could improve reliability of power supply, reduce transmission losses, improve the utilization of primary energy and reduce exhaust emissions, meet the electricity demand of users who lived in some places without power grid coverage. With the highly complementary and well-developed technology between wind and solar power, wind and solar complementary power generation system that was composed of wind turbine, photovoltaic array, battery and other components, was widely used as a typical distributed way of the power generation for its economy and reliability.Optimization and coordination of wind and solar complementary power generation system was the core problem that affected the stability of a system. To solve the complexity of wind and solar complementary power generation systems, a concept of the intelligent hybrid control Agent was proposed, and the leading Agent and mobile Agent used for optimization and decision making were introduced. According to hybrid characteristics of continuous dynamic and discrete event dynamic in the system, Colored Petri Nets (CPN) was introduced for model building and simulation, and it was also be used to model for four states transition of distributed power supply. In this paper, the CPN model was used to test and verify the consultation mechanism of power optimization and coordination, to inspect concurrency and consistency of systems, and to pre-solve conflicts and deadlocks that may arise in the system.To solve instable and discontinuous problems of renewable energy like wind and solar of distributed generation system, energy management and coordination control scheme based on the MAS and Petri nets technology was proposed in this paper. The devices in the system were transformed into relative independent individual Agent, and the flow of power was coordinated controlled through the communication among Agents. CPN was used to describe the discreteness and dynamic nature of distributed power generation system. To supply higher quality power for the loads, the system would supply power based on a quality composite index of generation equipments. Based on the CPN Tools platform, two models of wind and solar complementary power generation system were built for analyzing and comparing, they were ordinary CPN model and hierarchical colored Petri nets (HCPN) model. Simulation results showed that there were no deadlocks occur during the system operation process. Compared with the ordinary CPN model, the HCPN model was more rational and readable. The proposed scheme could make system power generation equipment achieve the goals that power was supplied to loads by decreasing order according to power quality composite index, the charging and discharging of batteries were controlled by real time, and the system run in a safe and stable mode.
Keywords/Search Tags:Renewable energy, Distributed generation system, Energy management system, Multi-agent system, CPN Tools development platform
PDF Full Text Request
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