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Research On Large Signal Modeling And Simulation Of Isolated Power System

Posted on:2019-04-03Degree:MasterType:Thesis
Country:ChinaCandidate:Y X YangFull Text:PDF
GTID:2382330593451604Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
Isolated power system provides an effective solution for the development of technologies,which of independent microgrid,space station,more electric aircraft and marine electric power propulsion system,because it has various forms of energy and flexible grid structure.Large signal stability is that the system can reach a new stable state without losing synchronization after serious disturbance.The problem of large signal stability in isolated power systems is prominent,which caused by sudden loading and unloading or trouble of large capacity electrical equipment and seriously affects the dynamic safety of the system.Taking B767 aircraft power system as an example,this paper studies the large signal modeling method of strategic power electronic devices and various loads of the isolated power system.The detailed works are as follows:(1)The structure and characteristics of several typical isolated power systems are introduced,such as independent microgrid and aircraft power system.The characters and research status of three kinds of large signal modeling methods are comparatively analyzed,which including Averaged-Value model,Generalized State Space Averaging(GSSA)method and dq Transform method.(2)The development history of the aircraft power system and the structure chart of B767 electrical system are introduced.On this foundation,the physical model simulation platform of B767 isolated power system is established to verify the effectiveness of system's large signal model.The output characteristics of power generation unit are simulated,which aiming at the input mechanical speed changing during aircraft operating conditions switching.(3)The GSSA and the dq Transform modeling method are introduced.In terms of the characteristics of AC and DC systems,a large signal modeling method is proposed based on GSSA and dq transform method.A large signal model is established by dq transform for typical AC devices,such as synchronous generators.Aimed at the typical DC power electronic devices such as DC/AC inverter and AC/DC rectifier,this article establishes and verifies the large signal models based on GSSA method.(4)Constant voltage / constant current / constant power DC loads operating characteristics are comparatively analyzed.Based on that,the GSSA method is used to establish the large signal model for load.Aiming at the complex interaction between AC and DC in the isolated power system,a GSSA method is proposed to establish the large signal model.The large signal model of the whole system is built and verified.
Keywords/Search Tags:Isolated Power System, Large Signal Model, Generalized State Space Averaging (GSSA) Method, dq Transform
PDF Full Text Request
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