Phương pháp điều chế NLM cải tiến không đo điện áp tụ áp dụng cho bộ biến đổi đa mức MMC=Improved NLM modulation method without measuring capacitor voltage applied to Modular Multilevel Converter

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Tác giả: Phương Hảo Lê, Đức Dương Nguyễn, Hoàng Long Nguyễn, Thị Thắm Nguyễn, Chí Hiếu Phạm, Việt Phương Phạm, Hùng Cường Trần

Ngôn ngữ: vie

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

Mô tả vật lý: tr.62-68

Bộ sưu tập: Metadata

ID: 486591

Thêm vào giỏ

Phương pháp điều chế NLM là phương pháp rất phù hợp để áp dụng cho bộ biến đổi đa mức MMC có số lượng lớn các SM. Phương pháp này có thể tạo ra một điện áp ở phía xoay chiều của MMC với số mức lên đến 2N+1 (với N là số SM trên mỗi nhánh). Bài báo này đề cập đến việc cải tiến phương pháp điều chế NLM cho bộ biến đổi MMC thông qua việc sử dụng thuật toán mà trong đó không cần sử dụng thông tin về điện áp trên các tụ điện. Thuật toán này sử dụng các phép toán logic đơn giản để lựa chọn các SM sẽ được bật hoặc tắt trong một chu kỳ làm việc để tiến hành phát xung điều khiển. Điều này có ý nghĩa rất lớn trong việc giảm đáng kể các cảm biến đo điện áp tụ, cảm biến đo dòng điện trên các nhánh cũng như các đấu nối tín hiệu phức tạp. Nhờ đó, việc thiết kế phần cứng trở nên gọn nhẹ hơn khi bộ biến đổi MMC cần phải sử dụng một số lượng lớn các SM trong các ứng dụng trung và cao áp. Kết quả của nghiên cứu được thực hiện trên Matlab/simulink và được so sánh với phương pháp điều chế NLM có đo điện áp trên tụ điện để đánh giá hiệu quả của phương pháp đã đề xuất.The NLM modulation method is particularly effective for Modular Multilevel Converter (MMC) systems with a large number of Submodules (SMs). This approach enables the generation of an output voltage on the AC side of the MMC, achieving up to 2N+1 voltage levels, where N represents the number of SMs in each branch. This article focuses on enhancing the NLM modulation technique for MMC converters by introducing an algorithm that eliminates the need for voltage measurements from the capacitors. Instead, it utilizes simple logical operations to determine which SMs to activate or deactivate during each duty cycle. This innovation significantly reduces the requirement for capacitor voltage and current sensors within the branches, streamlining the complexity of signal connections. Consequently, the hardware design becomes more compact, which is advantageous for MMC converters deployed in medium and high voltage applications. The outcomes of this study were simulated using Matlab/Simulink and were compared against the traditional NLM modulation method, which relies on capacitor voltage measurements to assess the performance of the proposed approach.

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