کنترل پیشبین مبدلهای چندسطحی چندبخشی با بهرهگیری از الگوریتم رمزگشایی کروی
محورهای موضوعی : مهندسی برق و کامپیوترحسین شفائیه هیق 1 , رضا محبوبی اسفنجانی 2 * , محمد هجری 3
1 - دانشگاه صنعتی سهند
2 - دانشگاه صنعتی سهند
3 - دانشگاه صنعتی سهند
کلید واژه: بهینهسازی رمزگشایی کرویکنترل پیشبینمبدل چندسطحی چندبخشی,
چکیده مقاله :
در مبدلهای چندسطحی چندبخشی با افزایش تعداد سطوح ولتاژ، کیفیت شکل موج خروجی بهبود مییابد و کلیدهای نیمههادی قدرت، ولتاژ کمتری را تحمل میکنند؛ اما با افزایش تعداد اجزای مدار، تعیین استراتژی کلیدزنی بسیار پیچیده میشود. در این مقاله، در چارچوب روش کنترل پیشبین با مجموعة کنترل متناهی، یک روش کارا برای تنظیم جریان بار، تعادل ولتاژ خازنها و همچنین کنترل جریان گردشی در مبدلهای چندسطحی ارائه میشود که از الگوریتم رمزگشایی کروی برای انجام محاسبات بهینهسازی استفاده میکند. ویژگی مهم رویکرد مورد استفاده، کاهش قابل توجه حجم محاسبات لازم در الگوریتم کنترل است که امکان استفاده از آن را برای مبدلهای چندبخشی با تعداد سطوح ولتاژ بالا و برای افقهای پیشبینی طولانی فراهم میکند. روش پیشنهادی بر روی یک نوع مبدل سهسطحی، شبیهسازی و مزایای آن در مقایسه با روشهای موجود نشان داده میشود.
Modular Multilevel Converters, by increasing the number of voltage levels the quality of output waveform is improved and the semiconductor switches tolerate low voltage values. However, design of switching strategy in these complicated circuits is challenging. In this paper, based on sphere decoding algorithm, a predictive controller with finite control set is proposed to regulate load current while minimizing both capacitor voltage variations and circulating currents. The suggested scheme decreases the computational burden of optimization stage which is considerable for long prediction horizons and modular converters with high number of voltage levels. The suggested scheme is simulated for a practical modular multilevel converter to demonstrate its performance compared to some rival methods.
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