تاثیر مدل¬سازی جامع سیستم زمین توسط روش برازش برداری بر اضافه ولتاژهای صاعقه در توربین¬های بادی مجزادر راستای هوشمندسازی برقگیرها
محورهای موضوعی : مهندسی برق- قدرت
مهرداد محمودیان
1
(موسسه آموزش عالی آپادنا - شیراز، ایران)
سجاد سعدی
2
(دانشکده مهندسي مکانيک بيوسيستم، دانشگاه تربيت مدرس، تهران، ايران)
کلید واژه: توربین بادی, حالات گذرای الکترومغناطیسی, سیستم زمین, روش برازش برداری,
چکیده مقاله :
احداث مزارع بادی در مناطقی با عدد ایزوکرونیک بالا، زیاد بودن ارتفاع برج، شدت گرفتن میدان الکتریکی ناشی از تیز بودن نوک پره¬ها و تماس احتمالی پره¬ها با ابر¬های مجاور، اهمیت بررسی اضافه¬ولتاژ اعمال شده به شبکه¬ی قدرت توسط موج فرکانس بالای صاعقه را روشن¬تر می¬سازد. همچنین سیستم زمین توربین بادی باید طوری طراحی شود تا علاوه بر دست¬یابی به مشخصات امپدانسی با مقادیر حالت ماندگار استاندارد، جریان صاعقه را به طور موثر به درون زمین تخلیه کند. در این مقاله، در شبیه سازی سیستم زمین پدیده¬ی یونیزاسیون خاک و رفتار فرکانس بالای الکترودهای آن مد نظر قرار گرفته است تا بتوان از آن به عنوان یک پتانسیل مرجع برای سنجش ولتاژ تمام نقاط استفاده نمود. سپس از روش برازش برداری برای مدل سازی سیستم زمین بهره گرفته شده است. البته ورودی روش برازش برداری را می¬توان پاسخ فرکانسی هر المان که به صورت عددی و با استفاده از روش¬های معمول مانند روش FDTD محاسبه شده است، در نظر گرفت. از آنجایی که استفاده از روش محاسباتی دقیق¬تر نتایجی با قابلیت اعتماد بیشتر را در اختیار بهره¬برداران قرار می¬دهد، لذا در این مقاله به بررسی اضافه¬ولتاژ به یک توربین بادی دو مگاواتی با استفاده از نرم افزار تخصصی EMTP پرداخته شده است.
The construction of wind farms in areas with high isochronic number, high tower height, intensification of the electric field due to the sharp tips of the blades and the possible contact of the blades with the nearby clouds, the importance of checking the overvoltage applied to the network The power by the high frequency wave makes the lightning brighter. Also, the wind turbine grounding system should be designed in such a way that, in addition to achieving impedance specifications with standard steady state values, it can effectively drain the lightning current into the ground. In this article, in the simulation of the earth system, the soil ionization phenomenon and the high frequency behavior of its electrodes have been considered so that it can be used as a reference potential to measure the voltage of all points. Then, the vector fitting method has been used to model the earth system. Of course, the input of the vector fitting method can be considered the frequency response of each element which is calculated numerically using common methods such as the FDTD method. Since the use of a more accurate calculation method provides more reliable results to the users, therefore, in this article, the overvoltage to a 2 megawatt wind turbine has been investigated using EMTP specialized software.
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