به‌کارگیری روش جدید انتقال فاز حامل تطبیقی جهت متعادل‌سازی ولتاژ باس DC مبدل پل H متوالی
محورهای موضوعی : مهندسی برق و کامپیوتر
میترا راه علی اصل
1
(دانشگاه صنعتی جندی‌شاپور دزفول)
مهدی سرادارزاده
2
(دانشگاه صنعتی جندی شاپور)
علیرضا نمدمالان
3
(دانشگاه صنعتی جندی‌شاپور دزفول)
کلید واژه: مبدل پل H سریجبران‌ساز سنکرون استاتیکیمتعادل‌سازی ولتاژ خازن‌هاانتقال فاز حامل تطبیقی,
چکیده مقاله :
مبدل پل H متوالی یکی از پرکاربردترین مبدل‌های چندسطحی در مبدل‌های توان بالا است. اما نامتعادلی ولتاژ DC خازن‌ها در این مبدل از مشکلات به کارگیری آنها به خصوص در کاربردهایی است که خازن‌ها از طریق شبکه شارژ می‌شوند. علت عمده بروز این نامتعادلی در ولتاژ خازن‌ها، تفاوت در تلفات هر سلول مبدل است. در این مقاله روش جدیدی برای متعادل‌سازی ولتاژ خازن باس DC مبدل چندسلولی پل H متوالی ارائه می‌شود که نیاز به اندازه‌گیری جریان عبوری از سلولها ندارد. روش پیشنهادی که انتقال فاز حامل تطبیقی (ACPS) نامیده می‌شود بر پایه استفاده از روش مدولاسیون عرض پالس مبتنی بر انتقال فاز بنا شده که با اندازه‌گیری ولتاژهای باس DC و تغییر مقدار انتقال فاز سلولها به متعادل‌سازی ولتاژ خازن‌ها می‌پردازد. روش پیشنهادی به صورت ریاضی تحلیل شده و جهت متعادل‌سازی ولتاژ خازن‌ها بر روی یک مبدل پل H متوالی هفت‌سطحی در کاربرد مبدل به‌عنوان جبران‌ساز سنکرون استاتیکی (STATCOM) استفاده شده است. شبیه‌سازی‌های متعددی در نرم‌افزار MATLAB/Simulink انجام شده که به خوبی کارایی روش متعادل‌سازی پیشنهادی در حفظ تعادل ولتاژ باس DC سلولها را نشان می دهد.
The cascaded H-bridge converter is one of the useful multilevel converters for high power applications. The unbalancing of cells DC bus voltages is a major issue in this topology especially when the capacitors are charged from the grid, which mainly is caused by the different losses of cells. In this paper a new method is proposed for balancing the cells DC bus voltages without need to measure the cells current. This method is named as “adaptive carrier phase shift”, which is based on the phase shift pulse width modulation. The balancing between the cells DC bus voltages is achieved by measuring the voltages and changing the carrier phase shift. This method is analyzed mathematically and is used to balance a 7-level cascaded H-bridge STATCOM. The feasibility and appropriate function of balancing method is investigated by the simulation studies in the MATLAB/Simulink software.
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