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首页> 外文期刊>Power Electronics, IET >Selective harmonic mitigation-pulse-width modulation technique with variable DC-link voltages in single and three-phase cascaded H-bridge inverters
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Selective harmonic mitigation-pulse-width modulation technique with variable DC-link voltages in single and three-phase cascaded H-bridge inverters

机译：单相和三相级联H桥逆变器中具有可变直流母线电压的选择性谐波缓解脉冲宽度调制技术

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摘要

There are different modulation techniques that can be used in medium-voltage and high-power electronic converters, but a few of them provide high efficiency and satisfy power quality requirements. This study presents a modified selective harmonic mitigation pulse-width modulation (SHM-PWM) technique which employs variable DC-link voltages as a degree of freedom in cascaded H-bridge (CHB) inverters. This degree of freedom increases the range of acceptable modulation indices, reduces the number of switching transitions and increases the number of harmonics that can be removed in selective harmonic elimination (SHE) (or SHM) techniques. Hence, in addition to efficiency improvement, a huge number of harmonics can be mitigated in AC side of the converter. Using this approach, triplen harmonics can be restricted to standard limits, in single-phase inverters. In addition, the proposed SHM-PWM approach employs the least number of switching transitions in a fundamental period to limit the specific number of harmonics compared to the alternative SHE or SHM techniques. In this study, the requirements of two well-known grid codes EN 50160 and CIGRE WG 36-05 are well satisfied and the validity of proposed method is verified by several simulations and experiments on a seven-level CHB inverter in single-phase and three-phase operating modes.
机译：在中压和大功率电子转换器中可以使用不同的调制技术，但是其中一些提供高效率并满足电能质量要求。这项研究提出了一种改进的选择性谐波抑制脉冲宽度调制（SHM-PWM）技术，该技术采用可变的直流母线电压作为级联H桥（CHB）逆变器的自由度。这种自由度增加了可接受的调制指数的范围，减少了开关转换的数量，并增加了在选择性谐波消除（SHE）（或SHM）技术中可以消除的谐波数量。因此，除了提高效率外，还可以减轻转换器交流侧的大量谐波。使用这种方法，可以在单相逆变器中将三次谐波限制在标准范围内。此外，与替代性SHE或SHM技术相比，建议的SHM-PWM方法在基本周期内采用最少数量的开关转换来限制特定的谐波数量。在这项研究中，很好地满足了两个著名的电网规范EN 50160和CIGRE WG 36-05的要求，并且通过在单相和三个相中的七电平CHB逆变器上进行的几次仿真和实验，验证了所提出方法的有效性。相操作模式。

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