Giải pháp chẩn đoán lỗi cảm biến dòng điện áp dụng chỉ số sai số bình phương trung bình cải tiến trong hệ truyền động động cơ không đồng bộ
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Abstract
Fault-tolerant control (FTC) plays a crucial role in maintaining the safety and reliability of induction motor drive systems, particularly in the presence of current sensor failures in field-oriented control (FOC) schemes. This paper proposes an FTC strategy that integrates an enhanced mean square error (MSE) index with a Luenberger observer (LO). The residual-based MSE index enables rapid identification of both soft and hard faults, effectively overcoming the cumulative delay inherent in conventional performance indices such as ITSE and ITAE. In parallel, the LO is employed to reconstruct the estimated stator current signals. Simulation results confirm that the proposed fault detection algorithm remains accurate even under transient operating conditions, allowing effective current recovery and preserving overall system stability.
Tóm tắt
Điều khiển chịu lỗi (Fault-tolerant control - FTC) đóng vai trò then chốt trong việc đảm bảo an toàn cho hệ thống truyền động động cơ không đồng bộ, đặc biệt trước các sự cố cảm biến dòng điện trong sơ đồ điều khiển định hướng từ thông (field-oriented control - FOC). Chiến lược FTC kết hợp chỉ số sai số bình phương trung bình (mean squared error - MSE) cải tiến và bộ quan sát Luenberger (Luenberger observer - LO) được đề xuất. Trong đó, chỉ số MSE dựa trên tín hiệu dư để phát hiện nhanh các lỗi mềm và cứng, khắc phục hạn chế về độ trễ tích lũy của các chỉ số truyền thống như ITSE và ITAE. Song song đó, LO thực hiện tái tạo tín hiệu dòng điện ước tính. Kết quả mô phỏng chứng minh thuật toán phát hiện lỗi chính xác ngay cả trong trạng thái quá độ, giúp khôi phục dòng điện hiệu quả và duy trì sự ổn định của hệ thống.
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