双向交直流变换器桥臂故障多矢量恒频模型预测容错控制

doi:10.19595/j.cnki.1000-6753.tces.190526

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摘要双向交直流变换器运行过程中的浪涌、尖峰等瞬态冲击会导致桥臂器件故障,进而威胁双向交直流变换器工作的可靠性。常规模型预测容错控制每个开关周期选取单个矢量作用于双向交直流容错变换器,所以开关频率不固定,难以准确跟踪目标矢量,电流谐波含量和功率脉动较大。为抑制常规模型预测容错控制下双向交直流变换器桥臂故障后的电流谐波和功率脉动,提出一种多矢量恒频模型预测容错控制方法。首先,重构桥臂故障后的双向交直流变换器系统结构,阐明故障容错运行机理及电压矢量变化。其次,建立容错运行模式的预测模型,在每个开关周期采用多个电压矢量的合成矢量跟踪目标矢量,并固定各矢量切换顺序,形成恒定开关频率。最后,仿真及实验结果表明,在所提控制策略下,双向交直流变换器发生桥臂故障后能够容错运行,且输出电流谐波减小,功率脉动下降,具有较好的稳态及动态性能。

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	李琰琰
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关键词 ：双向交直流变换器, 桥臂故障, 多矢量恒频, 模型预测容错控制, 容错运行

Abstract：Due to the transient impact of surge and spike during operation, the leg switch device fault of AC-DC converter will occur and threaten the reliable operation of converter. In the conventional model predictive fault-tolerant control method, only a single vector is selected to act on the bidirectional AC-DC converter with leg fault in each switching cycle, so the frequency is not fixed. It is difficult to track the target vector accurately, and the current harmonic content and power ripple are large as well. In order to reduce the current harmonics and power ripple in AC-DC converter after bridge arm fault under conventional model predictive fault-tolerant control, a multi-vector model constant frequency predictive fault-tolerant control strategy is proposed in this paper. Firstly, the system topology of bidirectional AC-DC converter with leg fault is reconstructed. Then the operation mechanism of fault-tolerant structure and the relationship of voltage vectors are clarified. Secondly, the power prediction model under fault-tolerant operation mode is established. Multiple voltage vectors are used in each switching cycle. The synthetic vector is used to track the target vector. The switching order of each vector is fixed to form constant switching frequency. Finally, the simulation model and experimental platform are built. The results show that under the proposed control strategy, the bidirectional AC-DC converter can operate fault-tolerant operation after the bridge arm fault, and the output current harmonics and power ripples are reduced. The system has good steady-state and dynamic performance.

Key words： Bidirectional AC-DC converter bridge arm fault multi-vector constant frequency model predictive fault-tolerant control fault-tolerant operation

收稿日期: 2019-05-06

PACS:

TM464

通讯作者: 金楠男,1982年生,博士,副教授,硕士生导师,主要研究方向为电能变换可靠性、模型预测控制。E-mail: Jinnan@zzuli.edu.cn

作者简介: 李琰琰女,1987年生,博士,讲师,主要研究方向为新能源逆变器的模型预测控制。E-mail: lyy0825@zzuli.edu.cn

引用本文:

李琰琰, 李国昊, 邓渊, 李强, 金楠. 双向交直流变换器桥臂故障多矢量恒频模型预测容错控制[J]. 电工技术学报, 2020, 35(10): 2206-2215. Li Yanyan, Li Guohao, Deng Yuan, Li Qiang, Jin Nan. Multi-Vector Constant Frequency Model Predictive Fault-Tolerant Control of Bidirectional AC-DC Converter with Leg Fault. Transactions of China Electrotechnical Society, 2020, 35(10): 2206-2215.

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