4724

4443

كارشناسي ارشد

قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1388

نه،91ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مرتضي سقائيان نژاد

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88/8/10

مهندسي برق و كامپيوتر

ID4443

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Analysis and Implementation of a New Step Up Down Three Phase Voltage Source Inverter and Design of Proper Controllers Behnam Koushki behnamkoushki@ec iut ac ir Date of Submission 2009 05 16 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Seyed Morteza Saghaian Nejad saghaian@cc iut ac irAbstractIn many industrial applications it is required to convert DC voltage to Three Phase AC voltage withamplitude greater than the input DC voltage Distributed generation systems in which the amplitude ofgeneration source is smaller than the amplitude of grid voltage UPSs in which the amplitude of DC inputreserve voltage is smaller than nominal voltage of supplied load and also Electic Vehicles in which it isrequired to both boost and invert DC input voltage are examples of these industrial applications In theseapplications supplied load may be a non sinusoidal load such as a computer or electrical drive with an inputrectifier The input rectifier draws a non sinusoidal current from the inverter Because of non sinusoidalshape of the current and its severe changes inverter operation is distorted Also in some cases suppliedload is an unbalanced load Additionally if several load are being supplied in parallel by the inverter connection and disconnection of each loads causes the inverter to experiences sudden load changes So aninverter should be able to handle all these challenge and supply the load with a balanced Three Phase ACvoltage with fixed and desired amplitude In this dissertation a new three phase inverter with boost abilityof input voltage is proposed designed and analyzed High efficiency less number of switches and lowercost and volume are distinguished characteristics of proposed inverter In the proposed inverter switcheswith negative voltage blocking capability are also not required Because of nonlinear behavior of the systemand existence of nonlinear load two nonlinear controllers including a sliding mode controller as well as acascade controller based on feedback linearization theory with fixed switching frequency are designed andapplied to the inverter Simulation results with PSIM software in various conditions such as nonlinear load change in the load and variation of the input voltage are carried out to verify the correctness of the proposedinverter and its controllers A laboratory setup of proposed inverter equipped with its sliding modecontroller is implemented completely with analogue circuits C T and Hall Effect sensor are not used in thesetup At the end experimental results are obtained and compared with simulation results They verify andconfirm the correctness of proposed inverter in addition to good operation of designed controllers Keywords Boost inverter sliding mode controller cascade control loop fixed switching frequency differential inverter

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