变流器开路故障下永磁直驱风电系统运行分析

发布时间：2018-05-15 12:42

本文选题：风力发电 + 永磁直驱式同步发电机　；参考：《电力系统自动化》2014年14期

【摘要】：变流器是永磁直驱风电系统中故障率最高的器件,文中针对变流器故障后系统运行特性的变化,在变流器数学模型的基础上,深入分析变流器中一个开关管发生开路故障后的工作情况。研究表明:一个开关管发生开路故障后系统可持续运行,但会影响该变流器的正常工作,引起对应侧电流波形畸变。在MATLAB/Simulink环境下建立永磁直驱风电系统模型,并搭建永磁直驱风力发电实验平台,分别在3种不同的开路故障下进行仿真和实验,围绕机侧和网侧电流、直流母线电压、有功输出比例、总谐波畸变率,评估故障对系统运行特性的影响。根据仿真和实验结果得出变流器开路故障特征:一个变流器的开路故障对另一侧的正常运行影响较小,但故障器件对应侧的相电流出现波形畸变。
[Abstract]:Converter is the device with the highest failure rate in permanent magnet direct drive wind power system. The working conditions of a switch tube after an open circuit fault in the converter are analyzed in depth. The results show that the system can run continuously after an open circuit failure of the switch tube, but it will affect the normal operation of the converter and cause the distortion of the current waveform at the corresponding side. The permanent magnet direct drive wind power system model is established in MATLAB/Simulink environment, and the experimental platform of permanent magnet direct drive wind power generation is built. The simulation and experiment are carried out under three kinds of open circuit faults respectively. The ratio of active power output, total harmonic distortion rate and the influence of fault on system performance are evaluated. According to the simulation and experimental results, the open circuit fault characteristics of the converter are obtained: the open circuit fault of one converter has little effect on the normal operation of the other side, but the phase current of the corresponding side of the fault device is distorted.
【作者单位】：湖南大学电气与信息工程学院;
【基金】：国家国际科技合作专项资助项目(2011DFA62240) 湖南大学青年教师成长计划资助项目~~
【分类号】：TM614;TM46

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