جبران عدم تعادل ولتاژ و جریان در ریزشبکه‌های DC دوقطبی با استفاده از فنر الکتریکی DC سه ساق

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی برق، دانشگاه شهید باهنر کرمان، کرمان، ایران

2 دانشیار، گروه مهندسی برق، دانشگاه شهید باهنر کرمان، کرمان، ایران

چکیده

ریزشبکه‌های DC دوقطبی با بارگذاری نامتقارن با مشکلات عدم تعادل ولتاژ و جریان در دو قطب مواجه هستند که می‌تواند انحراف ولتاژ در باس‌های ریزشبکه و تلفات توان را، به دلیل وجود جریان در سیم نول، افزایش دهند. یکی از روش‌های پیشنهاد شده برای رفع مشکل عدم تعادل ولتاژ و جریان در ریزشبکه‌های دوقطبی، استفاده از دو فنر الکتریکی DC مجزا به عنوان دو بار هوشمند و کنترل‌شده در دو قطب مثبت و منفی است. این ساختار نیازمند استفاده از تعداد کلید الکترونیک قدرت زیاد، دو عدد باتری یا ذخیره‌ساز مجزا در لینک DC دو فنر و ساختار کنترلی پیچیده است. در این مقاله، یک فنر الکتریکی DC سه‌ساق یکپارچه برای جبران عدم تعادل ولتاژ و جریان  در ریزشبکه‌های DC دو قطبی پیشنهاد شده است. ساختار پیشنهادی در مقایسه با دو فنر الکتریکی مجزا از تعداد کلید کمتری برخوردار بوده و به دلیل داشتن یک لینک DC مشترک تنها از یک مجموعه ذخیره‌ساز در ساختار آن استفاده شده است. کارایی ساختار پیشنهادی در جبران عدم تعادل ولتاژ و جریان از طریق شبیه‌سازی در محیط نرم‌افزار MATLAB/SIMULINK تایید شده است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Compensation of Voltage and Current Imbalance in Bipolar DC Microgrids Using a Three-leg DC Electric Spring

نویسندگان [English]

  • Ali Fazlabadi 1
  • Hossein Hojabri 2
1 Department of Electrical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
2 Department of Electrical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
چکیده [English]

Bipolar DC microgrids with asymmetric loading face the problems of voltage and current imbalance in two poles, which can increase the voltage deviation in microgrid buses and power losses due to the presence of current in the neutral wire. One of the suggested methods to solve the problem of voltage and current imbalance in bipolar microgrids is to use two separate DC electric springs as two controlled smart loads in positive and negative poles. This structure requires a large number of active switches, two separate battery or storage units in the DC link of these two DC electric springs, and a complex control structure. In this paper, a unified three-leg DC electric spring is proposed to compensate voltage and current imbalance in bipolar DC microgrids. Compared with two separate DC electric springs, the proposed structure has less number of active switches and due to its common DC link, only one storage set is used in its structure. The effectiveness of the proposed structure in compensating voltage and current imbalance is confirmed through simulation in the MATLAB/SIMULINK environment.

کلیدواژه‌ها [English]

  • Bipolar DC microgrid
  • unified three-leg DC electric spring
  • smart load
  • voltage imbalance compensation
  • current imbalance compensation

مراجع

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