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The Research On Multi-Agent System For Microgrid Control And Optimization

Posted on:2018-11-22Degree:MasterType:Thesis
Country:ChinaCandidate:Muhammad Waseem KhanFull Text:PDF
GTID:2392330590977605Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
In traditional power arrangements centralized control method is employed to manage the complete power system.These systems are generally identified to be inactive/passive since power flows outward from the utility grid to the consumers or load.With the deregulation and rearrangement of the energy industry tied with growing saturation of renewable energy?RE?resources and other traditional power generators such as,Distributed Generators?DGs?at the Microgrid?MG?level,the method power streams in the grid changes.Such kind of system is recognized as active systems since power can stream in bi-directions either from the distributed grid to the MG or vice-versa.Consequently,for centralized control technique,it may not be appropriate to efficiently accomplish the DGs at the MG level as it is charge incompetent and could show challenging to control DGs within the MG.Thus,a distributed/decentralized control technique is adopted as an alternative to centralized control technique.The main aim is to show that the MG can efficiently and effectively managed in a distributed manner while the financial assistances of the MG are exploited simultaneously.In recent years,the scope of green energy technologies at the MG level is highly accepted in demand to decrease the emission of CO2 and for a healthy environment.The distributed energy resources,for instance,solar combine heat and power?CHP?,solar photo voltaic?PV?,small diesel engines,wind turbines?WTs?and fuel cells technologies are growing in power systems.The operational control and maintenance of such electric power have excessive effect on power system.For optimum practice of electrical power in MGs,Multi-agent system?MAS?technology has approved that best manage the system at distributed level and has numerous applications in the power systems.In this thesis,for MG control and its optimum operation,a MAS technology which is basically a form of distributed control is considered for effective operation of MGs at distributed level.The foremost concept is to solve large multifaceted responsibilities by utilizing the agents.Local agents are considered such that they take their local decisions and perform their individual tasks without the involvement of a system central controller.Thus,it will exhibit intelligence to the system by their local decisions.Moreover,agents are adjustable to changes in situation and they can adjust instabilities or variations occurred within the MG.Java Agent DEvelopment framework?JADE?is one of the unique and highly suggested implementation tool of MAS to simulate and display agent performances.Additionally,JADE complies with IEEE Foundation of Intelligent and Physical Agents?FIPA?standards and can be easily used for implementation of agents.Secondly,a fully-controlled architecture of MG using MAS with different optimization practices functional to RE sources and a three-layer control system is proposed in the designing of MG for optimal and reliable operation having minimum power loss.Finally,the extensive application of permanent magnet synchronous generator?PMSG?based wind energy conversion system?WECS?has attracted growing interests of power researchers on its control and operation.The aims to propose a kind of fractional order sliding mode based?FOSM?power output control scheme of PMSG based WECS with fast exponential reaching law.The fast exponential reaching law based FOSM control technique proves to be better capable of attenuating the level of the chattering phenomenon with faster convergence speed.The boost converter and the neutral point clamped inverter,both of which are utilized to connect the PMSG and the power grid,are controlled with the proposed FOSM control scheme.Furthermore,the direct and quadrature grid current are tracked,which leads to the control of the active and reactive power output.The effectiveness of the proposed method is verified with an 8-kw wind turbine simulation and the test results indicate that the proposed method can better track the reference value of active and reactive power.In addition to that,the total harmonic distortion level of the grid current is largely mitigated.
Keywords/Search Tags:Microgrid, microgrid operation, control, multi-agent system, optimization, boost converter, fast exponential reaching law and fractional order sliding mode
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