Phương pháp điều chế Vector không gian ảo cải tiến cho Bộ nghịch lưu ba pha NNPC bốn bậc=Improved Virtual Space Vector Modulation for Four-Level Nested Neutral Point Clamped Inverters

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Tác giả: Đức Khoa Nguyễn, Văn Nhờ Nguyễn, Đăng Khoa Phạm

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Chuyên san Đo lường, Điều khiển và Tự động hóa, 2024

Mô tả vật lý: tr.20-33

Bộ sưu tập: Metadata

ID: 486747

Thêm vào giỏ

Bộ nghịch lưu bốn bậc cấu hình diode kẹp NNPC (Nested NeutralPoint Clamped) được sử dụng trong các hệ thống truyền động điệncông suất lớn hay điện áp trung thế, do đảm bảo chất lượng đầu rađiện áp tốt trong khi số lượng linh kiện ít hơn so với các dạng bộnghịch lưu 4 bậc truyền thống. Kỹ thuật SIN PWM (SPWM) áp dụngcho bộ biến đổi này thực hiện đơn giản nhưng có phạm vi điện áp ragiới hạn. Bài báo này trình bày kỹ thuật điều khiển điều chế độ rộngxung vector không gian ảo (VSVPWM) có giá trị áp common modetrung bình. So với phương pháp điều khiển độ rộng xung sin, kỹ thuậtnày đạt một số ưu điểm như cho phép điều khiển áp ra toàn phạm vigiản đồ vector không gian và đạt độ méo dạng sóng hài thấp. Việckiểm soát và cân bằng các tụ điện bay được thực hiện bằng việc sửdụng các trạng thái dư thừa nhánh pha (Phase-leg Redundant). Kếtquả phân tích giải thuật điều khiển bộ nghịch lưu này được kiểmchứng bằng mô phỏng trên phần mềm MATLAB/Simulink và thựcnghiệm trên mô hình thực tế. Các đánh giá độ méo dạng điện áp,dòng điện ngõ ra và điện áp trên các tụ bay cho thấy chất lượng củahệ thống bộ biến đổi tốt trong phạm vi hoạt động được khảo sát.The four-level diode-clamped NNPC (Nested Neutral Point Clamped) inverter configuration is employed in high-power electrical drive systems or medium-voltage applications due to its ability to ensure excellent output voltage quality while requiring fewer components comparedto traditional four-level inverter configurations. The Sinusoidal Pulse Width Modulation (SPWM) technique applied to this converter isstraightforward to implement but has a limited output voltage range. This paper presents a Novel and improved Virtual Space Vector PulseWidth Modulation (VSVPWM) with an average common-mode voltage. Compared to the sine-wave pulse width modulation method, thistechnique offers several advantages, such as enabling control of the entire space vector diagram and achieving low harmonic distortion in theoutput waveform. Control and balancing of the flying capacitors are achieved by utilizing phase-leg redundant states. The results of thecontrol algorithm analysis for this inverter are validated through simulations using MATLAB/Simulink software and experiments conductedon a real-world model. The evaluations of the Total Harmonic Distortion (THD%), output current, and voltage across the flying capacitorsdemonstrate the high-quality performance of the converter within the full voltage range.

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