期刊
ENERGIES
卷 16, 期 18, 页码 -出版社
MDPI
DOI: 10.3390/en16186569
关键词
modular multilevel converter (MMC); active rectifier; sensorless control; capacitor pre-charging
This paper presents a sensorless control method for the MMC-based rectifier, achieving stable DC output voltage and accurate input current control. The paper also introduces a safe and fast pre-charging scheme for the rectifier without output voltage sensors. The proposed control method exhibits excellent performance, strong fault-tolerant capability, and high accuracy in DC-bus voltage evaluation.
The modular multilevel converter (MMC) is recognized as one of the promising converters for the electrification of ships and railways. Among different energy conversion stages, the MMC-based rectifier should realize stable DC output voltage and accurate input current control. However, output DC-bus voltage sensors must be installed, which are costly and bulky. This paper presents a simple but effective control method for the MMC-based rectifier, removing the traditional output DC-bus voltage sensor. An accurate evaluation model of DC-bus voltage is developed as well as the implementing method. Meanwhile, a safe and fast pre-charging scheme is presented for the MMC-based rectifier without output voltage sensors. The fault-tolerant capability of the proposed method when the failure of the output DC-bus voltage sensor occurs is examined. Simulated and testing results demonstrate that the proposed method presents not only excellent steady-state and dynamic performance but also strong fault-tolerant capability. The proposed evaluation model for DC-bus voltage has a high accuracy with an error of less than 1%. Besides, the pre-charging time is less than 0.5 s using the proposed sensorless control.
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