基于参考电压矢量修复的三相AC/DC变流器容错控制

Fault-tolerant Control of Three-phase AC/DC Converter Based on Reference Voltage Vector Repair

为了优化风力发电系统中三相变流器容错运行能力,提出了一种基于参考电压矢量修复的三相AC/DC变流器容错控制方法。首先,通过对空间矢量脉宽调制算法中参考电压空间矢量在变流器开路故障前后变化的分析,说明了开路故障后参考电压空间矢量的畸变情况;然后,结合永磁同步发电机数学模型以及误差修复控制模型,推导得到开路故障后参考电压空间矢量的数学模型;最后提出了基于参考电压矢量修复的三相AC/DC变流器容错控制方法,并通过仿真以及实验验证了该方法的可行性与有效性。研究结果表明:所提出的容错控制方法不仅能够实现单管以及多管开路故障容错控制,还可以优化系统运行效果,增加系统容错运行时间。

In order to optimize the fault-tolerant operation capability of three-phase converter in a wind power system, a fault-tolerant control method of the three-phase AC/DC converter based on the reference voltage vector repair is proposed.Firstly, through the analysis of the change of the reference voltage space vector in the space vector pulse width modulation algorithm before and after the open circuit fault of the converter, the distortion of the reference voltage space vector after the open circuit fault is explained. Then, in combination with the mathematical model of the permanent magnet synchronous generator and the error correction control model, a mathematical model of the reference voltage space vector after the open-circuit fault is derived. Finally, a fault-tolerant control method of the three-phase AC/DC converter based on the reference voltage vector repair is proposed, and the feasibility and effectiveness of this method are verified through simulation and experiments. The research results show that the fault-tolerant control method proposed in this paper can be utilized to not only realize the fault-tolerant control of single-switch and multi-switch open-circuit faults, but also optimize the system operation effect and increase the fault-tolerant running time of the system.