مروری جامع بر الگوهای اساسی کلیدزنی اینورترهای منبع امپدانسی سهفاز
محورهای موضوعی : مهندسی برق و کامپیوتر
الیاس شوکتی اصل
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محسن حسن بابای نوزادیان
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1 - گروه پژوهشی انرژی خورشیدی، پژوهشکده انرژی، پژوهشگاه مواد و انرژی، کرج، ايران
2 - گروه مهندسی برق، دانشکده مهندسي، دانشگاه بوعلی سینا، همدان، ايران
کلید واژه: اینورتر منبع امپدانسی, روش کنترلی افزایش ساده, روش کنترلی افزایش ثابت بیشینه, تزریق هارمونیک سوم, شاخص مدولاسیون, بهره ولتاژ.,
چکیده مقاله :
اساسیترین روش برای کنترل اینورترهای منبع امپدانسی، روش کنترلی افزایش ساده میباشد. علاوه بر روش کنترلی افزایش ساده، روشهای کنترلی دیگری مانند روش کنترلی افزایش بیشینه، روش کنترلی افزایش بیشینه با تزریق هارمونیک سوم، روش کنترلی افزایش ثابت بیشینه و روش کنترلی افزایش ثابت بیشینه با تزریق هارمونیک سوم وجود دارند. روش کنترلی افزایش بیشینه دارای ناحیه عملکرد ممکن عریضتری نسبت به روش کنترلی افزایش ساده میباشد. در روش کنترلی افزایش بیشینه، جریان عبوری از سلفها و ولتاژ دو سر خازنها علاوه بر داشتن ریپل کوچک فرکانس بالا ریپل بزرگ فرکانس پایین دارد. به منظور کاهش حجم و هزینه شبکه منبع امپدانسی باید ریپلهای فرکانس پایین حذف شوند. برای این منظور میتوان از روش کنترلی افزایش ثابت بیشینه استفاده نمود. هم چنین تزریق هارمونیک سوم در روش کنترلی افزایش ثابت بیشینه نیز مورد استفاده قرار میگیرد که سبب افزایش محدوده شاخص مدولاسیون میشود. در این مقاله، هر یک از روشهای کلیدزنی افزایش ساده، افزایش بیشینه، افزایش بیشینه با تزریق هارمونیک سوم، افزایش ثابت بیشینه و افزایش ثابت بیشینه با تزریق هارمونیک سوم به تفصیل ارائه میشود و مزایا و معایب هر یک از این روشها تشریح میشود. در پایان، نتایج شبیهسازی کامپیوتری در محیط نرمافزار PSCAD/EMTDC جهت اثبات صحت روشهای کنترلی مرور شده ارائه میشود.
The most basic method for controlling impedance-source inverters is the simple boost control method. Besides the simple boost control method, several other control strategies have been developed, including the maximum boost control method, the maximum boost control method with third-harmonic injection, the maximum constant boost control method, and the maximum constant boost control method with third-harmonic injection.
Compared with the simple boost control method, the maximum boost control method provides a wider operating range. However, in this method, the inductor current and capacitor voltage exhibit significant low-frequency ripple in addition to the high-frequency ripple. To reduce the size and cost of the impedance-source network, these low-frequency ripples must be eliminated. For this purpose, the maximum constant boost control method is employed.
Moreover, third-harmonic injection can be incorporated into the maximum constant boost control method to further extend the modulation index range. In this paper, the switching methods of simple boost, maximum boost, maximum boost with third-harmonic injection, maximum constant boost, and maximum constant boost with third-harmonic injection are presented in detail, and the advantages and disadvantages of each method are discussed. Finally, simulation results obtained using PSCAD/EMTDC are provided to validate the accuracy of the reviewed control methods.
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