کاهش ظرفیت خازن لینک DC در اینورترهای خورشیدی متصل به شبکه با استفاده از یک مدار متعادل‌کننده موازی

نوع مقاله : علمی-پژوهشی

نویسندگان

1 دانشکده مهندسی برق و کامپیوتر - دانشگاه بیرجند

2 دانشکده مهندسی - دانشگاه فردوسی

چکیده

امروزه اینورترهای تک‌فاز متصل‌به شبکه به‌صورت گسترده‌ای در کاربردهای توان پایین، مراکز صنعتی و مسکونی به‌عنوان تأمین‌کننده توان مورداستفاده قرارگرفته‌اند. در سیستم‌های تک‌فاز توان ریپلی ذاتی با فرکانسی دو برابر فرکانس شبکه باعث به‌وجودآمدن نوسانات فرکانس پایین نامطلوب در ولتاژ لینک DC و جریان خروجی می‌شود. البته این مسئله با نصب یا استفاده از یک خازن الکترولیتی بزرگ برطرف می‌شود. اما استفاده از این فیلتر پسیو به این بزرگی منجربه کاهش اجتناب‌ناپذیر طول عمر و قابلیت اطمینان سیستم می‌شود. برای غلبه بر این مشکلات از روش‌های کمکی متعادل‌سازی توان برای کاهش ظرفیت خازن و جای‌گزینی آن با خازن‌های فیلمی، استفاده می‌شود. در این مقاله با معرفی یک جبران‌گر موازی و بهره‌گیری از تئوری توان‌های لحظه‌ای ظرفیت خازن متعادل‌کننده توان کاهش چشم‌گیری داشته‌است. ساختار سیستم کنترلی پیشنهادی براساس تئوریpq اصلاح‌شده و مدل‌سازی سیستم تک‌فاز به‌صورت یک سیستم سه‌فاز نامتعادل است. شبیه‌سازی سیستم براساس سیستم فتوولتاییک 3 کیلووات نصب‌شده در دانشگاه بیرجند است. عمل‌کرد سیستم پیشنهادی به‌وسیله نتایج شبیه‌سازی تأیید شده‌است و در پایان مقایسه هزینه‌ای بین ساختار پیشنهادی با ساختار متداول نیز انجام شده‌است.

کلیدواژه‌ها

عنوان مقاله [English]

Reducing the Dc-Link Capacitance for Grid-Connected Solar Inverters with Shunt Power Decoupling Circuit

نویسندگان [English]

  • M. Heidari 1
  • M. A. Shamsi-Nejad 1
  • M. Monfared 2
1 Faculty of Electrical and Computer Engineering, University of Birjand, Birjand, Iran
2 Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

Single phase grid-tied inverters are remarkably increasing in low-power applications such as residential and industrial power supplies. In the single phase system, the inherent ripple power at twice the line frequency results in undesirable low-frequency ripple in the dc-link voltage and output ac current. This issue can be eased through the installation of bulky electrolytic capacitors in the dc link. However, such passive filtering approach may inevitably lead to limited system lifetime and reliability. To overcome these problems, auxiliary power decoupling methods are used to reduce the size of the electrolytic capacitor and replace it with film capacitor. In this paper, By introducing a shunt switching compensator (SSC) and exploiting instantaneous power theory (pq theory), the size of the required capacitance remarkably decreased.The proposed controlling system, based on the modified pq theory and single-phase modeling, was similar to a three-phase unbalanced system regarding the structure. The system simulation was according to the 3Kw photovoltaic system used at the Birjand University. The simulation results verify the proposed power decoupling technique. At the end, a cost comparison between the proposed structure and prevalent structure is also done.

کلیدواژه‌ها [English]

  • Cost
  • DC link capacitor Grid-tied inverter
  • Modified instantaneous power theory
  • Shunt switching compensator

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