一种基于平均误差电流矢量幅值的三电平逆变器输出波形质量评价方法

发布时间：2018-04-10 00:24

本文选题：三电平逆变器　切入点：同步空间矢量调制　出处：《中国电机工程学报》2017年21期

【摘要】：该文以应用于中压大功率电机驱动的三电平逆变器为对象,针对同步空间矢量调制策略,提出一种逆变器输出电流波形质量的评价方法。通过建立一个采样周期内误差电流矢量终端轨迹三角形的重心与平均误差电流矢量幅值之间的等效关系,推导得到不同开关序列作用下逆变器平均误差电流矢量幅值的表达式。在此基础上,进一步推导得到不同调制策略在一个基波周期内平均误差电流矢量幅值的表达式。以连续同步空间矢量和5种不连续同步空间矢量调制策略为例,将根据表达式计算得到的平均误差电流矢量幅值与根据傅里叶分析得到的输出电流总需求谐波畸变率进行比较,两者结果一致,验证该文提出的评价方法的正确性。所以该文提出的评价方法对于各种同步空间矢量调制策略输出波形质量的比较和开关序列的优化设计具有指导意义。
[Abstract]:Aiming at the synchronous space vector modulation (SVPWM) strategy, a method for evaluating the quality of output current waveform of a three-level inverter driven by a medium-voltage and high-power motor is presented in this paper.By establishing the equivalent relationship between the center of gravity of the terminal trajectory of error current vector and the amplitude of average error current vector in a sampling period, the expressions of average error current vector amplitude of inverter under different switching sequences are derived.On this basis, the expressions of average error current vector amplitudes of different modulation strategies in a fundamental period are derived.Taking the continuous synchronous space vector and five discontinuous synchronous space vector modulation strategies as examples, the amplitude of the average error current vector calculated by the expression is compared with the harmonic distortion rate of the total demand for the output current obtained by Fourier analysis.The two results are consistent and verify the correctness of the evaluation method proposed in this paper.Therefore, the evaluation method proposed in this paper has a guiding significance for the comparison of output waveform quality of various synchronous space vector modulation strategies and the optimal design of switch sequences.
【作者单位】：天津大学电气与自动化工程学院;天津市电机系统先进设计与智能控制技术工程中心;
【基金】：国家重点基础研究发展计划项目(973计划)(2013CB035600) 国家自然科学基金项目(51407127) The National Basic Research Program of China(973 Program)(2013CB035600) Project Supported by National Natural Science Foundation of China(51407127)
【分类号】：TM464

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