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12444

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قدرت

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

۱۳۹۷

هشت، ۹۷ص.: مصور، جدول، نمودار

حسين فرزانه‌فرد

احسان اديب

1397/05/08

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID12444

چكيده 1 فصل اول مقدمه 1 1 پيشگفتار 2 1 2 اهداف پاياننامه 6 1 3 روند ارائه مطالب 6 فصل دوم مروري بر مبدلهاي دوجهته كليدزني نرم 2 1 مقدمه 8 2 2 مبدل دوجهته با كليدزني نرم با مدار رزونانس سري 8 LC 2 2 1 مراحل كليدزني 9 2 3 مبدل دوجهته ZVT شماره يك 01 2 3 1مراحل كليدزني 21 2 4 مبدل دوجهته ZVT شماره دو 21 2 4 1 مراحل كليدزني 31 2 5 مبدل دوجهته ZVT شماره سه 61 2 5 1 مراحل كليدزني 71 2 6 مبدل دوجهته مهاركننده فعال شماره يك 12 2 6 1مراحل كليدزني 22 2 7مبدل دوجهته مهاركننده فعال شماره دو 42 2 7 1مراحل كليدزني 52 فصل سوم معرفي مبدل دوجهته ZVT پيشنهادي اول مقدمه 72 3 1 بررسي عملكرد مبدل دوجهته پيشنهادي 82 3 2 تحليل عملكرد حالت بوست 92 3 3 تحليل عملكرد حالت باك 73 3 4 طراحي مبدل پيشنهادي 34 3 5 كنترل مبدل پيشنهادي 64 3 6 پيادهسازي عملي مبدل پيشنهادي اول 74 3 7 3 7 1 حالت بوست 84 3 7 2 حالت باك 35 3 8 مقايسه مبدل پيشنهادي 55 فصل چهارم معرفي مبدل دوجهته مهاركننده فعال پيشنهادي دوم 4 1 مقدمه 95 4 2 بررسي عملكرد مبدل دوجهته پيشنهادي 06 هفت

98 Providing Soft Switching in a Wide Load Range for None Isolated Bidirectional Converters Amin Jafarzadeh Jazi Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Degree M Sc Language PersianSupervisor Prof Hosein Farzanehfard Hosein@cc iut ac ir Adviser Dr Ehsan Adib E Adib@cc iut ac ir Abstract Bidirectional converters are used to transfer power between two sources Most ofthese converters are developed using unidirectional converters and adding a switch inreverse parallel position with each diode and adding a anti parallel diode with the mainswitch These converters are employed in systems that require power transfer in twodirections with energy storage capability such as hybrid electric vehicles photovoltaicsystems fuel cell systems and uninterruptible power supplies The bidirectional DC DCconverters are categorized under isolated and non isolated types Isolated bidirectionalconverters are applied in applications which need high voltage gain and isolation Non isolated bidirectional converters have recieved the most attention due to their simplicity Inall DC DC converters the goal is increasing the switching frequency to reduce volume andsize of passive components However in hard switching converter increasing theswitching frequency would increase the switching losses and noise In order to solve theseproblems soft switching condition should be provided for semiconductor devices Themain challenge is to provide soft switching condition by employing minimum number ofextra passive and active elements In this thesis two bidirectional convertrs based on zero voltage transition ZVT andactive clamped methods are introduced In ZVT methods the auxiliary circuit is activatedin a short period of time resulting in low circulating current In addition the voltage stressof the main switches is low The main contribution of the proposed converter is reducingthe number of auxiliary elements Also the first proposed converter provides soft switching condition for main switches by employing only two auxiliary switches a diode an inductor and a capacitor for both directions The theoretical analysis and designguideline are presented in details The presented simulation and experimental results arecompared and a through discusion is provided The second proposed converter is an activeclamped type which is obtained by omitting a switch and replacing it with a diode in thefirst proposed converter As a result simpler converter control is achieved In contrast toother active clamped converters the second proposed converter can operate under soft switching condition even at light loads and high output voltages Operation principles anddesign consideration are presented Also simulation and experimental results of theproposed converter verify the validity of theoretical analysis Key words Bidirectional Converter Soft Switching Zero Voltage Transition ActiveClamp

حسين فرزانه‌فرد

احسان اديب