بهبود همزمان ریپل گشتاور و شار در کنترل DTC موتور PMSM با استفاده از کنترل سیکل وظیفه بردارهای ولتاژ
محورهای موضوعی : مهندسی برق و کامپیوتروحید قاسمیان سوربنی 1 , سیداصغر غلامیان 2 , سیدمهدی میرایمانی 3 *
1 - دانشگاه صنعتي نوشیروانی بابل
2 - دانشگاه نوشیروان بابل
3 - دانشگاه صنعتی نوشیروانی بابل
چکیده مقاله :
مقاله پیش رو به ارائه روشی برای کنترل همزمان ریپل گشتاور و شار در کنترل DTC موتور PMSM میپردازد. برخلاف الگوریتمهای پیادهشده قبلی بر مبنای کنترل سیکل وظیفه بردارهای ولتاژ که توجهی به وضعیت شار استاتور نمیگردید، در این مقاله با استفاده از کمینهسازی یک تابع هدف دومتغیره گشتاور و شار، ریپل شار استاتور نیز به همراه ریپل گشتاور کنترل شده و در نتیجه باعث دایرهایتر شدن مسیر شار استاتور در دستگاه مختصات ساکن و کاهش ریپل و هارمونیک جریان میگردد. برای نیل به این هدف در هر سیکل کنترلی، معادلات دینامیکی شار استاتور نیز به همراه معادلات دینامیکی گشتاور بررسی شده و وضعیت بردار شار و گشتاور موتور در انتهای زمان اعمال هر بردار ولتاژ پیشبینی خواهد شد. سپس انحراف معیار هر دو متغیر ریپل گشتاور و ریپل شار بررسی شده و مجموع نرمالیزهشده این دو به عنوان تابع هدف انتخاب میگردد. در پایان یک زمان بهینه تغییر بردار ولتاژ برای کمینهکردن تابع هدف مزبور محاسبه خواهد شد و کارایی روش پیشنهادی با پیادهسازی در محیط MATLAB Simulink راستیآزمایی میگردد.
This paper presents a novel method for controlling torque and stator flux ripples in DTC control of PMSM motor. In contrast to conventional duty ratio modulation methods which do not pay attention to stator flux condition, the proposed method controls both torque and stator flux RMS ripples using minimization of a proper two variable (stator flux and torque) objective function. After realizing that, flux related machine specifications such as circular stator flux vector trajectory and current waveform quality will be developed. For this purpose, in addition to torque dynamics in any DTC control cycle, stator flux dynamics will be studied. Using this, the condition of both torque and stator flux at the end of an applied voltage vector of inverter is predicted. Then, standard deviation of torque RMS ripple and that of stator flux is studied in any control cycle and the normalized sum of these two deviations will be considered as the objective function. Finally, a proper switching instant during any control cycle is calculated for minimizing the objective function. The proposed method is validated by MATLAB simulation.
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