تحلیل وشبیه سازی مدل سیگنال کوچک ژنراتور سنکرون مجازی در سیستم ریزشبکه
الموضوعات :
غضنفر شاهقلیان
1
,
محمد رضا مرادیان
2
,
محمد علی زنجانی
3
1 - دانشکده مهندسی برق، دانشگاه آزاد اسلامی، واحد نجف آباد، نجف آباد، ایران
2 - دانشکده مهندسی برق، دانشگاه آزاد اسلامی، واحد نجف آباد، نجف آباد، ایران
3 - دانشکده مهندسی برق، دانشگاه آزاد اسلامی، واحد نجف آباد، نجف آباد، ایران
الکلمات المفتاحية: اینورتر, اینرسی مجازی, ژنراتور سنکرون, سیگنال کوچک, معادله نوسان,
ملخص المقالة :
ریزشبکه های مبتنی بر منابع تولید پراکنده از طریق مبدلهای الکترونیک قدرت به شبکه اصلی برق متصل میشوند که دارای اینرسی مکانیکی و میرایی کمی هستند، بنابراین باید مشخصات دینامیکی سیسم قدرت همزمان با ادغام منابع انرژی تجدیدپذیر به منظور پایداری بهبود پیدا کنند. ژنراتورهای سنکرون مجازی یکی از روشهای موثر برای ادغام سیستمهای انرژی تجدیدپذیر در شبکه برق است. برای داشتن رفتاری مشابه ژنراتور سنکرون واقعی به تغییر یا اختلال توسط ژنراتور سنکرون مجازی، عمل کنترل در مبدل الکترونیک قدرت واحد تولید پراکنده انجام میشود. در این مقاله با استفاده از مدل سیگنال کوچک و مدل فضای حالت ویژگیهای دو روش افت و ژنراتور سنکرون مجازی برای کنترل توانهای اکتیو و راکتیو مقایسه شده است. ارزیابی بین این دو استراتژی کنترلی متفاوت با استفاده از نتایج شبیهسازی در محیط متلب انجام شده است. همچنین ویژگیهای ژنراتور سنکرون در اثر تغییرات ممان اینرسی و ضریب میرایی نشان داده شده است. مدل سیگنال کوچک سیستم مورد مطالعه در سیمولینک متلب نیز پیادهسازی شده است. ادغام ژنراتور سنکرون مجازی در ریزشبکه علاوه بر کاهش انحرافات فرکانس و ولتاژ، باعث بهبود پایداری نیز میشود.
Study of attenuation reduction of power electronic converters in the network
Comparison of droop control method with virtual synchronous generator technique
Determination of small signal model of virtual synchronous generator connected to infinite bus
Comparison of response speed for load changes of two control methods
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