کاهش هارمونیک‌های ولتاژ با استفاده از کنترل‌کننده افتی در عملکرد موازی اینورترها
محورهای موضوعی : مهندسی برق و کامپیوتر
بهادر فاني
1
(دانشگاه آزاد اسلامی واحد نجف‌آباد)
مجيد معظمي
2
(دانشگاه آزاد اسلامی واحد نجف‌آباد)
عماد فرهودي
3
(دانشگاه آزاد اسلامی واحد نجف‌آباد)
کلید واژه: ریزشبکهکنترل‌کننده افتیعملکرد جزیره‌ایهارمونیک ولتاژ,
چکیده مقاله :
تکنولوژی ریزشبکه‌ها استفاده هماهنگ و سودمند منابع انرژی گوناگون را برای تأمین بارهای موجود میسر می‌سازد. جهت داشتن یک عملکرد هماهنگ بین منابع اینورتری هنگام مواجهه با پدیده جزیره‌ای‌شدن، استفاده از ساختار کنترل‌کننده افتی بسیار سودمند خواهد بود. در این مقاله، کنترل‌کننده افتی معمول به گونه‌ای اصلاح می‌شود که توان به طور متناسب بین منابع تقسیم و باعث تنظیم ولتاژ دقیقی در خروجی منابع شود. به واسطه ارائه مدلی برای اینورتر متصل به بار غیر خطی، کنترل‌کننده افتی هارمونیکی طراحی می‌شود. از طریق کنترل‌کننده افتی مربوط به هر هارمونیک، ولتاژهای هارمونیکی محاسبه و به ولتاژ مرجع اضافه می‌شود که در نتیجه کیفیت ولتاژ خروجی بهبود می‌یابد. سپس حلقه کنترل ولتاژ اینورتر با امپدانس مقاومتی در حضور بارهای غیر خطی به گونه‌ای اصلاح می‌شود که به هنگام ترکیب با کنترل‌کننده افتی هارمونیکی، THD ولتاژ خروجی به طور قابل ملاحظه‌ای کاهش یابد. نتايج شبيه‌سازي نشان‌دهنده توانايي روش پيشنهادي در كاهش هارمونيك‌هاي ولتاژ در عملكرد موازي اينورترها مي‌باشد.
Microgrid technology makes possible coordination and effective use of different energy resources for supplying loads. In order to have synchronous operation between inverter resources during the occurrence of islanding condition, the use of droop controller structure would be beneficial. In this paper, the conventional droop controller is modified to divide proportional power between resources and cause accurate voltage setting in output resources. By providing a model for connected inverter to the nonlinear load, a harmonic droop controller has been designed. By droop controller related to each harmonic, the harmonic voltages are calculated and add to the reference voltage. Therefore the quality of the output voltage is improved. Then the inverter voltage control loop would be modified with resistance impedance in the presence of non-linear loads, so that, in combination with harmonic droop controller, THD of output voltage considerably reduced. Simulation results show the ability of suggested method in reduction of harmonic voltages in inverters parallel operation.
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