فهرست:
چکیده 1
فصل اول: مقدمه 2
1-1 مقدمه 3
وقوع حالت جزیره‌ای.. 6
1-2- ساختار پایاننامه 11
1-3- جمع‌بندی 12
فصل دوم: بررسی اثرات DG بر حفاظت سیستم توزیع 14
2-1- مقدمه 15
2-2-مشکلات حفاظتی 15
2-2-1-کورسازی حفاظت.. 16
2-2-2-قطع اشتباه 16
2-2-3-مشکلات بازبست.. 18
2-3- راه‌حل‌های مشکلات حفاظتی در حضور DG 20
2-3-1-راه‌حل‌های مشکلات آشکارسازی و انتخاب‌گری.. 20
2-3-2-رفع مشکلات بازبست.. 21
2-3-3- حل مشکل بازبست خارج از سنکرون و جزیره‌ای شدن. 22
2-4- بهبود‌ها در سیستم های حفاظتی 23
2-5- جمع‌بندی 25
فصل سوم: مروری بر روش‌های آشکارسازی حالت جزیره‌ای 26
3-1-مقدمه 27
3-2- روش‌های محلی آشکارسازی حالت جزیره‌ای 28
3-2-1-1 استفاده از فرکانس، ولتاژ و فاز ولتاژ. 28
3-2-1-2- نرخ تغییر فرکانس (ROCOF) 30
3-2-1-3- نرخ تغییر ولتاژ. 31
3-2-1-4- اعوجاج هارمونیکی کل ولتاژ و جریان. 31
3-2-1-5-نرخ تغییر توان اکتیو خروجی DG. 32
3-2-2-انواع روش‌های فعال. 32
3-2-2-1-اندازه‌گیری امپدانس... 33
3-2-2-2-تغییر توان اکتیو خروجی DG. 33
3-2-2-3-تغییر در مرجع توان راکتیو خروجی DG. 34
3-2-2-4- انحراف فرکانس فعالAFD)) 35
3-2-2-5- جابجایی فرکانس به وسیله لغزش فاز (SMS ) 36
3-2-2-6-جابجایی خودکار فاز (APS ) 37
3-2-3-روش‌های ترکیبی.. 38
3-2-3-1-نامتعادلی ولتاژ و فیدبک مثبت فرکانس... 38
3-2-3-2-تغییرات ولتاژ و جابجایی مرجع توان راکتیو. 39
3-2-4- روش‌های راه‌دور. 39
3-3- جمع‌بندی 40
فصل چهارم: توربین‌های بادی ژنراتور القایی از دو سو تغذیه (DFIG) و ادوات جبران‌ساز SVC و STATCOM.... 41
4-1 مقدمه 42
4-2- اصول الکتریکی توربین‌های بادی.. 43
4-3 توربین بادی DFIG 46
4-3-1 ژنراتور القایی دو سو تغذیه. 47
4-3-1-1- مدل ریاضی DFIG. 47
4-3-1-2- معادلات الکتریکی.. 50
4-3-1-3- معادلات ماشین.. 51
4-3-2- شماتیک کنترل و مدارهای سیتم DFIG. 52
4-3-2-1- طرح کنترلی DFIG. 52
4-3-2-2- طرح کنترل مبدلهای PWM پشت به پشت.. 52
4-3-2-3- کنترل مبدل سمت روتور. 52
4-3-2-4- کنترل مبدل سمت شبکه. 53
4-4 جبران‌ساز VAR استاتیکی SVC 56
4-4-1- اصول کلی.. 56
4-4-2- نحوهی اتصال. 58
4-4-3- مزایای SVC. 58
4-5 جبران‌ساز سنکرون استاتیکی (STATCOM) 58
4-6 مقایسه‌ی STATCOM و SVC 59
4-7 بلوک دیاگرام‌های شبیه‌سازی‌ها در نرم‌افزار DIgSILENT 60
4-7-1- بلوک دیاگرام‌های شبیه‌سازی DFIG در DIgSILENT. 60
4-7-2- بلوک دیاگرام‌های شبیه سازی STATCOM در DIgSILENT. 63
4-8 جمع‌بندی 64
فصل پنجم: روش پیشنهادی 65
5-1 مقدمه 66
5-2-سیستم آزمون 66
5-3- تبدیل موجک گسسته 68
5-4 تعریف شاخص‌ها 77
5-5 طبقه بندی رخدادها از یکدیگر 79
5-5-1 درخت تصمیم‌گیری.. 79
5-5-2 نحوهی تولید الگوها 81
5-5-3 آموزش درخت تصمیم‌گیری.. 84
5-6 جمع‌بندی 86
فصل ششم: مطالعات عددی 87
6-1- شبیه‌سازی‌ها 88
6-2- کلیدزنی بار. 88
6-3- کلیدزنی خازن 93
6-4 بروز خطا 95
6-5 بروز حالت جزیره‌ای 100
6-6 جمع‌بندی 101
فصل هفتم: نتیجه‌گیری و پیشنهادها 102
7-1 نتیجه‌گیری 103
7-2 پیشنهادها برای ادامه‌ی کار 104
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