Kỹ thuật PWM đa sóng mang IPD, POD và APOD cho nghịch lưu ba pha NNPC năm bậc=IPD, POD and APOD Multi-carrier PWM Techniques for Five-Level Nested Neutral Point Clamped Inverter

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Tác giả: Văn Nhờ Nguyễn, Đăng Khoa Phạm, Hoài Thương Trần

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.45668

Bộ sưu tập: Metadata

ID: 486742

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Gần đây, các thiết bị biến đổi công suất điện áp cao và công suất lớn trong công nghiệp, trong lưới điện dạng bộ nghịch lưu đa bậc NNPC (Nested Neutral Point Clamped) được đề xuất và phát triển. Các phương pháp điều khiển cho bộ biến đổi này được chú trọng đầu tư nghiên cứu nhằm cung cấp điện áp và dòng điện ngõ ra chất lượng cao như đạt độ méo dạng sóng hài thấp, giảm điện áp Common mode. Phương pháp điều chế độ rộng xung đa sóng mang (CBPWM) là một lựa chọn do nguyên lý đơn giản, dễ thực hiện.Bài báo này nghiên cứu và so sánh đặc tính các kỹ thuật Sin CBPWM áp dụng cho bộ nghịch lưu năm bậc NNPC. Các kỹ thuật CBPWM phổ biến bao gồm kỹ thuật bố trí cùng pha (IPD - In phase disposition), bố trí ngược pha (POD - Phase opposition disposition) và bố trí ngược pha luân phiên (APOD - Alternative phase opposition disposition). Kỹ thuật điều khiển cân bằng điện áp trên các tụ DC nhờ tận dụng các trạng thái điện áp trùng lặp cũng được áp dụng. Kết quả khảo sát bằng mô phỏng dùng phần mềm PLECS và kiểm chứng bởi mô hình thực nghiệm cho thấy, phương pháp IPD-PWM cho độ méo dạng sóng hài nhỏ nhất, phương pháp PODPWM có ưu điểm vượt trội vì có thể hạn chế giá trị điện áp Common mode (CMV - Common mode voltage) ở mức thấp nhất, phương pháp điều chế APOD-PWM có chất lượng sóng hài tốt hơn so với POD-PWM nhưng vẫn còn xuất hiện các xung áp CMV cao khi làm việc ở phạm vi điện áp lớn. Kết quả nghiên cứu cho thấy, giải thuật cân bằng áp tụ áp dụng tốt cho cả 3 kỹ thuật IPD-PWM, POD- PWM và APOD-PWM.Recently, high-voltage and high-power devices in industrial applications and power grids in the form of Nested Neutral Point Clamped(NNPC) multi-level inverters have been proposed and developed. Control methods for these converters have received significant researchattention to provide low output harmonic distortion and reduced Common Mode Voltage (CMV). Carrier-Based Pulse Width Modulation(CBPWM) is a preferred choice due to its simplicity. This paper investigates and compares the characteristics of various Sine-triangleCBPWM techniques applied to the five-level NNPC inverter, such as In-Phase-Disposition PWM (IPD-PWM), Phase-OppositionDisposition PWM (POD-PWM), and Alternative-Phase-Opposition-Disposition PWM (APOD-PWM). The balancing of DC capacitor voltages is realized by repetitive voltage states. Both simulated and experimental results reveal that the IPD-PWM method yields the lowestharmonic distortion. The POD-PWM technique excels in limiting the Common Mode Voltage (CMV) magnitude. Meanwhile, APODPWM offers better harmonic waveform quality compared to POD-PWM but still exhibits higher CMV magnitude during high-voltage operation. The results also demonstrate that the capacitor voltage balancing algorithm is effective for all three techniques, including IPDPWM, POD-PWM, and APOD-PWM.

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