ارائه‌ روشی ترکیبی مبتنی بر رویکرد کنترلی پیش‌بین مدل به‌منظور کنترل طبقه یکسوساز ترانسفورماتور الکترونیک قدرت

نوع مقاله : علمی-پژوهشی

نویسندگان

دانشکده مهندسی برق - دانشگاه علم و صنعت ایران

چکیده

در این مقاله به بررسی و ارائه روشی کنترلی برای طبقه ورودی ترانسفورماتور الکترونیک قدرت پرداخته می‏شود. ساختار متداول ترانسفورماتور فرکانس پایین با هسته آهنی، دارای معایبی از قبیل عدم کنترل‏پذیری ولتاژ و جریان، حساسیت زیاد به هارمونیک، کیفیت پایین ولتاژ در هنگام اشباع و ... است. ترانسفورماتور الکترونیک قدرت از چندین طبقه مبدل الکترونیک قدرت تشکیل شده و از­آن­جایی که در پژوهش حاضر، استفاده از آن به عنوان جایگزینی برای منبع تغذیه موجود در کاربرد قطارهای برقی مد نظر بوده است؛ به­صورت کاهنده در نظر گرفته شده و خروجی آن به صورت ولتاژ DC‏ است. بنابراین، ساختار مورد مطالعه از دو طبقه یکسوساز ورودی و DC-DC کاهنده تشکیل شده که به­ترتیب وظیفه یکسوسازی ولتاژ متناوب ورودی و کاهش سطح ولتاژ یکسوشده را بر عهده دارند. در این مقاله، روشی ترکیبی مبتنی بر رویکرد پیش‏بین مدل به­منظور متعادل­سازی ولتاژ خازن­های طبقه یکسوساز و هم­چنین، کنترل ضریب قدرت ورودی ارائه می­شود. مزیت روش پیشنهادی نسبت به دیگر روش‏های موجود، سادگی الگوریتم، کاهش قابل توجه حجم محاسبات نسبت به روش پیش­بین سنتی و کنترل مناسب و هم­زمان جریان و ضریب قدرت ورودی و ولتاژ خروجی است. در نهایت، با انجام شبیه­سازی در محیط نرم­افزار MATLAB/Simulink صحت عملکرد روش ارائه شده تصدیق می­شود.

کلیدواژه‌ها

عنوان مقاله [English]

A Hybrid Control Strategy Based on Model Predictive Control Approach for the Rectifier Stage of Solid-State Transformer

نویسندگان [English]

  • P. Haghgooei
  • D. A.Khaburi
  • M. Khosravi
School of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

This paper focuses on studying the Solid-State Transformer (SST) and proposing a control strategy for its input stage. The conventional low-frequency transformers suffer some drawbacks such as uncontrolled voltages and currents, high sensitivity to harmonics, low voltage quality in saturation conditions and so on. The solid-state transformer consists of several power electronic converter stages and as it is designed to be utilized as the power supply in electric train applications in this research, it is considered to be step-down and only has a DC output. Therefore, the studied configuration only consists of rectification and DC-DC step-down conversion stages. The main contribution of this paper is to propose a hybrid method based upon the Model Predictive Control (MPC) approach in order to balance the capacitor voltages and also control the power factor of input rectifier. The suggested strategy provides some advantages compared to other methods such as simple algorithm, significantly lower computational burden (compared to the conventional predictive control method) and simultaneous control of the input current, power factor and also the output voltage. Finally, the feasibility of the proposed method is verified through conducting simulations in the MATLAB/Simulink environment.

کلیدواژه‌ها [English]

  • Solid-State Transformer (SST)
  • Cascaded H-bridge (CHB) rectifier
  • Model Predictive Control (MPC) method
  • Capacitor voltage balancing

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