فهرست:
فصل اول: مقدمه
1-1- مقدمه....................................................................................................................................................................... 2
1-2- پیشینه و سوابق....................................................................................................................................................... 3
1-3- مروری بر گذشته کنترل سیستم تحریک استاتیک ژنراتور سنکرون....................................................................... 4
1-4- اهداف این پایان نامه.................................................................................................................................................. 9
1-5- جنبه‌های نوآوری این پایان نامه.................................................................................................................................. 10
فصل دوم: مقدمه‌ای بر مبدل باک
2-1- مبدل باک step-down(buck) converter......................................................................................................... 12
2-2- حالت هدایت پیوسته مبدل باک.............................................................................................................................. 15
2-3- ریپل ولتاژ خروجی مبدل باک..................................................................................................................................... 17
2-4- مزایا مبدل باک.......................................................................................................................................................... 19
2-5- معایب مبدل باک...................................................................................................................................................... 19
2-6- مزایای منابع تغذیه سوئیچینگ............................................................................................................................... 19
2-7- معایب منابع تغذیه سوئیچینگ.............................................................................................................................. 20
2-8- کنترل مبدل DC-DC باک..................................................................................................................................... 20
2-9- بهبود پاسخ حالت دائمی با طراحی کنترل کننده مد لغزشی............................................................................... 21
2-10- توصیف مبدل.......................................................................................................................................................... 21
2-11- مدل سازی مبدل باک.............................................................................................................................................. 22
2-12- مدل فضای حالت مبدل باک................................................................................................................................... 22
2-13- کنترل مد لغزشی مبدل باک(sliding mode control)................................................................................... 25
2-14- تئوری کنترل لغزشی............................................................................................................................................... 25
2-15- طراحی کنترلر مد لغزشی(SMC)........................................................................................................................ 26
2-16- تعیین سطح لغزش................................................................................................................................................ 27
2-17- اعمال شرط لغزش.................................................................................................................................................. 28
2-18- کنترل لغزشی مبدل باک........................................................................................................................................ 28
2-19- تعیین قانون کنترل.................................................................................................................................................. 30
2-20- مزایای کنترل مد لغزشی........................................................................................................................................ 31
2-21- معایب کنترل مد لغزشی....................................................................................................................................... 32
2-22- نکات........................................................................................................................................................................ 32
فصل سوم: مقدمه‌ای بر ژنراتورها
3-1- ژنراتور قدرت............................................................................................................................................................... 35
3-2- دسته‌بندی ژنراتورها با توجه به نوع توربین گردنده روتور......................................................................................... 35
3-2-1- ژنراتورهای dc............................................................................................................................................... 35
3-2-2- ژنراتور القایی................................................................................................................................................ 35
3-2-3- ژنراتور سنکرون............................................................................................................................................ 36
3-3- ساختمان ژنراتور سنکرون و انواع آن.......................................................................................................................... 38
3-4- ساختار ژنراتور سنکرون و مدار سیم‌پیچی................................................................................................................. 39
3-4-1- معادلات پایه متناسب با dq0.................................................................................................................... 41
3-4-2- معادلات اصلی ریاضی ژنراتور سنکرون........................................................................................................ 43
3-5- نظریه سیستم تحریک.............................................................................................................................................. 44
3-5-1- سیستم تحریک چیست؟............................................................................................................................ 44
3-5-2- اجزای تشکیل دهنده سیستم تحریک........................................................................................................ 45
3-5-2-1. تولید جریان روتور...................................................................................................................................... 45
3-5-2-2. منبع تغذیه............................................................................................................................................... 45
3-5-2-3. سیستم تنظیم کننده خودکار ولتاژ (میکروکنترلر)............................................................................... 45
3-5-2-4. مدار دنبال کننده خودکار.......................................................................................................................... 46
3-5-2-5. کنترل تحریک............................................................................................................................................. 46
3-5-2-6. محدود کننده جریان روتور........................................................................................................................ 46
3-5-2-7. محدود کننده مگاوار................................................................................................................................ 47
3-5-2-8. محدود کننده شار اضافی........................................................................................................................ 47
3-5-2-9. تثبیت‌کننده سیستم قدرت..................................................................................................................... 47
وظایف سیستم تحریک..................................................................................................................................................... 47
3-6- مدلسازی یکسو ساز تریستوری شش پالسه........................................................................................................ 48
3-6-1- تریستورو مشخصه استاتیکی آن.............................................................................................................. 48
3-6-2- یکسو ساز شش تریستوری........................................................................................................................ 52
فصل‌چهارم: نتایج حاصل از شبیه‌سازی
4-1- مقدمه....................................................................................................................................................................... 56
4-2- شبیه سازی یکسو ساز شش پالسه تریستوری..................................................................................................... 56
4-3- شبیه سازی مبدل باک و خواص آن........................................................................................................................... 58
4-3-1- نحوه طراحی مبدل باک............................................................................................................................... 58
4-4- بررسی THD و FFT در ولتاژ ورودی به تحریک ژنراتور............................................................................................ 64
4-5- شبیه‌سازی ژنراتور سنکرون...................................................................................................................................... 67
4-5-1- معادلات دینامیکی ژنراتور سنکرون............................................................................................................. 68
4-5-2- بلاک s-function........................................................................................................................................ 77
4-5-2-1- مراحل شبیه‌سازی بلاک s-function.................................................................................................... 77
4-5-2-2- Flagها در s-function.......................................................................................................................... 79
4-6- متغیرهای مورد استفاده در سیمولینک................................................................................................................... 80
فصل پنجم: نتیجه‌گیری و پیشنهاد برای آینده
5-1- نتیجه‌گیری................................................................................................................................................................ 88
5-2- پیشنهادات برای آینده............................................................................................................................................... 89
منابع و مأخذ...................................................................................................................................................................... 90
پیوست‌ها........................................................................................................................................................................... 92
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