| In recent years, with the modernization of industry and people’s living standardsimproved, the demand for quantity and quality of energy are higher than before, butenergy is limited, which requires the application of energy is efficient and fast. Powerconversion technology is a kind of technology which can improve the energyapplication efficiency. Therefore, the power conversion technology research hasbecome a hot spot. In order to improve the energy conversion efficiency of powerconverters, the research focuses on the power converter modeling and control methods.The power converter is a nonlinear time-varying systems with complex dynamiccharacteristics, which demands good modeling and control methods, but aboutcommon modeling methods, some can not clearly express system physical concept,some modeling is difficult to establish. In control method, common linear controlmethods can not be applied in the strongly nonlinear system, even if some non-linearmethod can improve the stability of the system, but they are not able to show thesystem physical characteristics and system energy correlation. This paper uses theconcept of an emerging regional system as the power converter modeling, and slidingmode control method with strong robustness is used as control algorithm，which canbetter solve problems existing in the traditional model and control method. The maincontent is as follows:①In this paper, sliding mode control method based on energy power converterregional system modeling is proposed. Around this method, this paper firstly describesthe basic structure and principle of the power converter, and analyzes some commonlyused control algorithms and their advantages and disadvantages. Then this papersummarizes the basic definitions and characteristics of the regional system and thedevelopment process and the research status of regional systems at home and abroad,summarizes some characteristics of regional systems (such as positive definiteness, themass conservation and boundedness, etc.), forms of expression and control method.②This paper builds the DC-DC power converter model by the concept ofregional model, firstly the model of state space average model of the power converteris established, using the converter energy storage component (inductance L,capacitance C) as the system area. Then this paper establishes Boost circuit, Buckcircuit and Cuk circuit model using the components energy as the system state variables, and simplifies the model, which is In favor of the follow-up controllerdesign, then the model Matlab simulation is executed to verify the validity of themodel.③The design of sliding mode control method based on energy is finished used inthe Boost, Buck and Cuk circuit control, and design of the sliding mode algorithm isintroduced in detail, and then the simulation is given. The simulation results alsoproves that the design of the control method has excellent dynamic performance andstability, good robustness under external disturbances, compared with the passivesliding mode control. The results show the anti-interference ability, stability anddynamic of this method have great improvement compared with the passive slidingmode control algorithm.Almost nobody uses regional systems in power electronic system at home, theregional system introduced into the power converter modeling in this paper is arelatively novel idea, which better eliminates the disadvantage not easy to establish thesystem model and clearly express the physical concepts in traditional method. Usingsliding mode method to control the system has strong robustness and fast, which willenable the power converter in the power conversion strong ability to respond toexternal interference, and improve work efficiency. Subsequent simulation andcomparing results with the passivity sliding mode control method also show theadvanced nature of the proposed method. |
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