پشتیبانی سریع فرکانس توسط مزارع باد با استفاده از پارامتر انحراف فرکانس و حد گشتاور روتور ژنراتور القایی دوسو تغذیه
محورهای موضوعی : انرژی های تجدیدپذیر
سید عبدالرحمان احمدنژاد
1
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رامتین صادقی
2
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بهادر فانی
3
1 - دانشکده مهندسی برق- دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران
2 - دانشکده مهندسی برق- دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران
3 - دانشکده مهندسی برق- دانشگاه آزاد اسلامی، واحد اصفهان (خوراسگان)، اصفهان، ایران
کلید واژه: افت دوم فرکانس, پشتیبانی موقت فرکانس, توربین باد, ژنراتور القایی دوسو تغذیه, کنترل فرکانس,
چکیده مقاله :
با توجه به نفوذ منابع انرژی تجدیدپذیر و توربین‌های باد در سیستم‌های قدرت، اهمیت این منابع در حفظ و کمک به کنترل فرکانس برای افزایش سطح حداقل فرکانس (FN) در شرایط گذرای سیستم بسیار معنادار و لازم خواهد بود. این مقاله برای پشتیبانی فرکانس سیستم و حذف افت دوم فرکانس و همچنین بازیابی سرعت روتور توربین باد مبتنی بر ژنراتور القایی دوسو تغذیه (DFIG) یک طرح پیشنهاد می‌کند. در این طرح به محض تشخیص اختلال، مرجع توان به صورت خودکار و تابعی از دو پارامتر تغییرات فرکانس سیستم و سرعت روتور توربین باد مبتنی بر حد گشتاور افزایش می‌یابد و سپس با همین دو پارامتر برای وادار کردن سرعت روتور به همگرا شدن به یک محدوده عملیاتی پایدار، مرجع توان کاهش می‌یابد تا جائی که توان الکتریکی از توان مکانیکی به صورت شیب ملایم و نه پله‌ای کمتر شده و منجر به بازیابی سریع سرعت روتور می‌گردد و در تمام مدت پشتیبانی از فرکانس، خواص مشخصه ردیابی نقطه بیشینه توان (MPPT) حفظ شده تا در صورت تغییرات در سرعت باد به بهبود بهتر فرکانس سیستم کمک کند. نتایج شبیه‌سازی در نرم‌افزار متلب بر اساس سیستم آزمون نشان می‌دهد طرح پیشنهادی به خوبی توانسته است فرکانس سیستم را بدون ایجاد افت دوم در فرکانس بهبود بخشد و سرعت روتور را به خوبی و سریع بازیابی کند.
Considering the penetration of renewable energy sources and wind turbines in power systems, the importance of these sources in maintaining and helping to control the frequency to increase the rare frequency level will be very meaningful and necessary. This paper proposes a design for supporting the system frequency and eliminating the second drop in frequency as well as restoring the speed of the wind rotor turbine based on the double-fed induction generator (DFIG). In this design, as soon as the disturbance detected, the power reference increased intelligently and as a function of the two parameters of the system frequency, changes and the wind turbine rotor speed based on the torque limit. Then, through these two parameters, to force the rotor speed to converge to a stable operating range, the power reference reduced until the electrical power is less than the mechanical power in a gentle slope and not a step, and finally leads to a quick recovery of the rotor speed. Another advantage of proposed scheme is that the characteristic properties of MPPT maintained throughout the frequency support, which helps to better improve the frequency of the system in case of changes in wind speed. The proposed scheme simulated based on the test system in MATLAB software. The simulation results show that the proposed scheme is able to improve the system frequency without causing a second dip and restore the rotor speed well and quickly.
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