دو روش کلیدزنی جدید به منظور کنترل سرعت موتور القایی در اینورتر یازده‌سطحی دیود- کلمپ
محورهای موضوعی : مهندسی برق و کامپیوتر
محمدصادق عرفی یگانه
1
,
نوید غفارزاده
2
,
محمد سروی
3
1 - دانشگاه بین‌المللی امام خمینی
2 - دانشگاه بین‌المللی امام خمینی
3 - دانشگاه بین‌المللی امام خمینی
کلید واژه: اعوجاج هارمونیکی کلاینورتر چندسطحیبر مبنای موج حاملپهنای پالس مدولاسیون چندحامله,
چکیده مقاله :
با بهره‌گیری از روش‌های کلیدزنی رایج در صنعت، این مقاله دو روش کلیدزنی جدید چندحامله (بر مبنای موج حامل) را برای بهبود مشخصه‌های ولتاژ خروجی در یک اینورتر یازده‌سطحی دیود- کلمپ ارائه داده است. هارمونیک‌های زوج و مؤلفه DC در روش‌های پیشنهادی COOD و VFCBOD، با اعمال شیفت فازی در موج حامل، حذف گردیده‌اند و در نتیجه مقدار اعوجاج هارمونیکی کل و ریپل گشتاور کاهش یافته است. با استفاده از دو روش پیشنهادی، تعداد متوسط کلیدزنی‌ها در یک دوره تناوب به طور برابر بین کلیدها توزیع می‌گردد و طول عمر کلیدها افزایش می‌یابد. در این مقاله یک اینورتر پل کامل به هر فاز اینورتر یازده‌سطحی دیود- کلمپ برای ایجاد تغییر در پلاریته ولتاژ سری گردیده است تا بتوان الگوهای کلیدزنی بیشتری را برای تولید سطوح معین ولتاژ به کار گرفت. سپس با تعیین صحیح الگوی کلیدزنی‌ها می‌توان اینورتر را در صورت خرابی کلیدها با الگوی کلیدزنی جایگزینی راه‌اندازی کرد و قابلیت اطمینان را افزایش داد.
By using usual industrial switching methods, two new multicarrier PWM (MCPWM) methods are proposed in this paper to improve the output voltage characteristics for eleven levels diode-clamped inverter. DC component and Even harmonic orders of the output voltage are totally eliminated in the proposed VFCBOD and COOD methods by applying the phase shift in the carrier wave (carrier-based); so total harmonic distortion (THD) and torque ripple are reduced. By using the both proposed methods, the number of pulses per cycle equally are distributed and increased the lifetime of the switches. In this paper, a full bridge has been series with each phase of eleven levels diode-clamped inverter to change the polarity of the voltage to produce more switching patterns to generate the specified voltage levels. Then, by determining suitable switching patterns, the inverter can be driven with the least of switches when there is a failure and finally increased the reliability of the whole system.
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