یک اینورتر بهبود یافته‌ی تمام پل هفت‌کلید و هفت‌سطحی با تعداد کلیدهای فعال کم‌تر نسبت به ساختارهای متداول برای کاربردهای ولتاژ متوسط

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد برق، دانشگاه علم و صنعت ایران

2 استاد دانشکده‌ی برق، دانشگاه علم و صنعت ایران

چکیده

اینورترهای چندسطحی استفادهای زیادی در کاربردهای ولتاژ متوسط و توان زیاد دارند و هم‌چنین به علت بازدهی مناسب، کاربردهای فوتوولتائیک بسیار استفاده می‌شوند. هرچه تعداد سطح‌های ولتاژ خروجی افزایش یابد، میزان تلفات در فیلتر خروجی کاهش می یابد ولی هزینه‌ی اینورتر افزایش می یابد. از این رو باید بین تعداد سطح‌ها و هرینه‌ی تمام شده یک مصالحه صورت گیرد. با اضافه‌شدن سطح‌های بیش‌تر اغتشاش هارمونیکی کل در شکل موج ولتاژ و جریان خروجی کاهش پیدا می‌کند. در این مقاله، یک اینورتر تمام‌پل اصلاح شده‌ی هفت‌سطحی و هفت‌کلیدی ارایه شده‌است. اینوتر پیشنهادی نسبت به اینوترهای هفت‌سطحی دیگر دارای تعداد کلید فعال و در نتیجه تلفات هدایتی کم‌تر و مدار کنترلی ساده است. مدولاسیون استفاده شده باعث می‌شود که اینورتر پیشنهادی تحت هر دو شرایط توان اکتیو و توان راکتیو عمل‌کند. شبیه‌سازی اینورتر در توان 30kVA به وسیله‌ی نرم‌افزار PSpice، صحت توپولوژی پیشنهادی و روش مدولاسیون را تایید می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

A new Modified H bridge seven level seven switch with reduced number of switches for medium voltage applications

نویسندگان [English]

  • A.H Akbari 1
  • P. Ardalan 1
  • a. abrishamifar 2
1 Iran University of Science and Technology, Faculty of Engineering
2 iust
چکیده [English]

Multilevel inverters have great applications in medium-voltage and high-power applications and also have found successful industrial applications. Modified full bridge inverter is one of the most popular topologies among the multilevel inverters because of lower number of switches and simpler structure than others. In this paper, a seven-switch and seven-level modified full bridge topology is proposed. Compared to the practical seven-level inverters like neutral point inverters, the proposed inverter reduces three active switches and has lower conduction loss and simple control. The input voltage to the given inverter is a DC source (Vdc) which has been shared between three identical capacitors and it is capable of producing output of seven level (Vdc, 2Vdc/3, Vdc/3, 0, -Vdc, -Vdc/3, -2Vdc/3). As more steps are added to waveform, the harmonic distortion of the output waveform decreases. The proposed modulation enables the proposed inverter to operate under both active and reactive power conditions. A 1KVA single-phase sample circuit is simulated by the PSPICE software to verify the validity of the proposed topology and modulation method. The results show the proposed topology is suitable for photovoltaic (PV) applications.

کلیدواژه‌ها [English]

  • Multilevel inverters
  • Modified full bridge
  • PWM modulation
  • Reactive power
  • PSPICE
  • Grid-connected

مراجع

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سابقه مقاله

  • تاریخ دریافت: 07 مهر 1397
  • تاریخ بازنگری: 25 اردیبهشت 1398
  • تاریخ پذیرش: 12 مرداد 1398

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