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首页> 外文期刊>IEEE Transactions on Industrial Electronics >Neutral-point-clamped inverter with improved voltage waveform and control range
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Neutral-point-clamped inverter with improved voltage waveform and control range

机译：中性点钳位逆变器，电压波形和控制范围得到改善

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摘要

A hysteresis controller-based PWM method for neutral point clamped (NPC) inverters is proposed. The closed-loop system uses the two-axis components of the transformed line-to-line voltage vectors as the control variables. In its linear control range, the PWM method includes two operating modes, namely, low and high references. At high references' mode, the output voltage is generated by switching among four vectors instead of three to improve the waveform generation. The proposed system has a linear control range 15.5% wider than conventional phase control methods. Furthermore, the control range can be easily expanded beyond the higher linear controllable range up to the square waveforms without suddenly increasing the waveform distortion. Therefore, the fundamental component of the output voltage can be smoothly and continuously controlled from zero up to square waveforms. The control circuit includes a hysteresis controller that is capable of stabilizing the neutral point potential variations within fixed limits during steady and transient states. The control method also offers high performance and fast response. Computer simulations and experimental results on a laboratory-tested motor drive are given to validate the proposed control scheme.
机译：提出了一种基于迟滞控制器的中性点钳位（NPC）逆变器PWM方法。闭环系统将变换后的线间电压矢量的两轴分量用作控制变量。在其线性控制范围内，PWM方法包括两种工作模式，即低参考值和高参考值。在高参考电压模式下，通过在四个矢量而不是三个矢量之间切换来生成输出电压，以改善波形生成。提出的系统的线性控制范围比传统的相位控制方法宽15.5％。此外，可以在不突然增加波形失真的情况下，将控制范围轻松扩展到更高的线性可控范围之外，直至方波。因此，可以从零到方波平滑，连续地控制输出电压的基本分量。控制电路包括一个磁滞控制器，该控制器能够在稳态和瞬态期间将中性点电势变化稳定在固定范围内。该控制方法还提供了高性能和快速响应。给出了在实验室测试的电动机驱动器上的计算机仿真和实验结果，以验证所提出的控制方案。

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