استفاده از روش‌های پردازش سیگنال برای تخمین امپدانس شبکه‌های قدرت ولتاژ پایین در محدوده فرکانسی kHz 2 تا kHz 150
الموضوعات :محمدمهدی علیان‌نژادی 1 , حمید حسن‌پور 2 , فیروز زارع 3
1 - دانشگاه صنعتی شاهرود
2 - دانشگاه صنعتی شاهرود
3 - دانشگاه کوییزلند استرالیا
الکلمات المفتاحية: پاسخ فرکانسیتبدیل موجکتخمین امپدانس شبکهتوزیع زمان- فرکانس,
ملخص المقالة :
در این مقاله با تزریق پالس مربعی به شبکه‌های قدرت ولتاژ پایین و بهره‌گیری از روش‌های پردازش سیگنال، امپدانس شبکه در محدوده فرکانسی kHz 2 تا kHz 150 تخمین زده می‌شود. امپدانس شبکه از دید یک نقطه به صورت نسبت سیگنال ولتاژ به جریان عبوری از آن نقطه در حوزه فرکانس محاسبه می‌شود. در شرایط نویزی دقت تخمین امپدانس با انرژی سیگنال تزریقی رابطه مستقیم دارد. به منظور تخمین امپدانس باید سیگنال‌های تزریقی انرژی کافی در محدوده فرکانسی مورد اندازه‌گیری را داشته باشد. در روش ارائه‌شده، ابتدا تعدادی پالس مربعی با عرض متفاوت به کمک الگوریتم ژنتیک انتخاب می‌شوند. پس از تزریق سیگنال‌های انتخاب‌شده به شبکه و اندازه‌گیری پاسخ شبکه به هر تزریق، سیگنال‌های اندازه‌گیری حذف نویز می‌شوند و بنابراین دقت تخمین امپدانس بیشتر می‌شود. اگر مدت زمان اندازه‌گیری سیگنال‌ها کم باشد، همه حالت گذرای شبکه اندازه‌گیری نشده و تخمین امپدانس نادرست خواهد بود. بنابراین در این مقاله روشی مبتنی بر توزیع‌های زمان- فرکانس به منظور تعیین مدت زمان لازم برای اندازه‌گیری پیشنهاد می‌شود. نتایج آزمایش روش پیشنهادی بر روی چندین شبکه نشان‌دهنده توانایی و دقت روش پیشنهادی در تخمین امپدانس شبکه می‌باشد.
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