تحلیل وشبیه سازی مدل سیگنال کوچک ژنراتور سنکرون مجازی در سیستم ریزشبکه
محورهای موضوعی : ریز شبکه قدرت
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
کلید واژه: اینورتر, اینرسی مجازی, ژنراتور سنکرون, سیگنال کوچک, معادله نوسان,
چکیده مقاله :
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.
Microgrids based on distributed generation sources are connected to the main power grid through power electronic converters that have low mechanical inertia and damping, so the dynamic characteristics of the power system must be improved simultaneously with the integration of renewable energy sources for stability. Virtual synchronous generators are one of the effective methods for integrating renewable energy systems into the power grid. In order to have a behavior similar to that of a real synchronous generator when changed or disturbed by a virtual synchronous generator, the control operation is performed in the power electronic converter of the distributed generation unit. In this paper, the characteristics of two droop methods and a virtual synchronous generator for controlling active and reactive powers are compared using the small signal model and the state space model. The evaluation between these two different control strategies is performed using simulation results in the MATLAB environment. Also, the characteristics of the synchronous generator due to changes in the moment of inertia and damping coefficient are shown. Integrating the virtual synchronous generator in the microgrid, in addition to reducing frequency and voltage deviations, also improves stability.
بررسی کاهش میرایی کاربرد مبدلهای الکترونیک قدرت در شبکه
مقایسه روش کنترل افتی با تکنیک ژنراتور سنکرون مجازی
تعیین مدل سیگنال کوچک ژنراتور سنکرون مجازی متصل به شین بینهایت
مقایسه سرعت پاسخدهی به ازای تغییرات بار دو روش کنترلی
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