Điều khiển bộ biến đổi MMC nối lưới sử dụng bộ điều khiển LADRC tăng cường khả năng chống nhiễu=Control of the MMC converter for grid connection enhances noise immunity using LADRC control

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Tác giả: Đức Dương Nguyễn, Việt Phương Phạm, Hùng Cường 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.33-41

Bộ sưu tập: Metadata

ID: 486748

Thêm vào giỏ

Bộ biến đổi (BBĐ) MMC là giải pháp tốt cho hệ thống kết nối cácnguồn năng lượng phân tán và hệ thống HVDC với lưới điện. Tuynhiên, với số lượng lớn các SM trong cấu trúc MMC khiến cho việcđiều chế trực tiếp tạo ra nhiều quá trình động học phức tạp khiMMC hoạt động. Quá trình này sẽ gây ra nhiễu ảnh hưởng rất lớntới việc kết nối lưới điện, đặc biệt là các lưới điện yếu. Bài báo nàyđề xuất giải pháp điều khiển loại bỏ nhiễu chủ động tuyến tính dựatrên bộ điều khiển LADRC nhằm triệu tiêu các nhiễu dao động sinhra không kiểm soát do hoạt động của MMC. Bộ điều khiển nàyđược kết hợp với phương pháp điều chế NLM để tạo được 2N+1mức điện áp xoay chiều với xung đóng tần số thấp cho các van. Vàđây là một phương pháp tiềm năng để nâng cao mức độ ổn định củahệ thống nhờ khả năng chống nhiễu cao và hiệu suất theo dõi tốt.Quá trình này dựa trên mô hình trở kháng tín hiệu nhỏ của hệ thống có tính đến việc ghép tần số được thiết lập. Các kết quả chứng minhđược thực hiện trên phần mềm matlab/simulink.The MMC converter stands out as a promising solution for integrating distributed energy sources and HVDC systems with the grid. However, the inherent complexity of the MMC structure, characterized by a large number of submodule (SM) units, presents challenges duringoperation, particularly in direct modulation scenarios. These complexities manifest as dynamic processes that can induce interference, significantly impacting grid connectivity, especially in weak power grid scenarios. This paper presents a control solution aimed at mitigatinglinear active disturbances by leveraging the Linear Active Disturbance Rejection Control (LADRC) technique. The proposed controller,when integrated with the Nearest Level Modulation (NLM) method, enables the generation of 2N+1 AC voltage levels with low-frequencyclosing pulses for the valves. This approach shows promise in enhancing system stability owing to its robust anti-interference capabilitiesand superior tracking performance. The methodology is rooted in a small-signal impedance model that accounts for frequency couplingdynamics. The efficacy of the proposed solution is validated through simulations conducted by using Matlab/Simulink software.

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