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首页> 外文期刊>Power Electronics, IET >Modulation of a trapezoidal signal: improving signal quality and reducing costs in power inverters
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Modulation of a trapezoidal signal: improving signal quality and reducing costs in power inverters

机译：梯形信号的调制：提高信号质量并降低功率逆变器的成本

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摘要

Power inverters applied in industries have seen a growth in modulation techniques over recent years. The aim of modulation techniques is to improve the quality of the inverter output signal and to reduce inverter losses. To improve an output signal, the amplitude of the fundamental frequency should be increased and the harmonics should be reduced. If a modulation technique can achieve these two objectives, a much smaller output filter is required to reduce hardware cost and filter losses. In this study, a technique is proposed where the obtained modulated signal can be directly used without the need of filtering. The resulting frequency profile fulfils the EN50160 standard, which sets the limits for harmonic components to ensure the quality in public low-voltage and medium-voltage power supplies. In addition, the proposed scheme requires a low computational algorithm allowing the use of low-cost microprocessors or Digital Signal Processor (DSPs). The proposed algorithm is based on a simple vector seed, making it possible to obtain all the patterns of Pulse Width Modulation (PWM).
机译：近年来，工业应用的功率逆变器在调制技术方面得到了增长。调制技术的目的是提高逆变器输出信号的质量并减少逆变器损耗。为了改善输出信号，应增加基频的幅度，并减少谐波。如果一种调制技术可以实现这两个目标，则需要一个更小的输出滤波器以降低硬件成本和滤波器损耗。在这项研究中，提出了一种无需滤波即可直接使用获得的调制信号的技术。最终的频率曲线符合EN50160标准，该标准设定了谐波分量的限制，以确保公共低压和中压电源的质量。另外，提出的方案需要低计算算法，从而允许使用低成本微处理器或数字信号处理器（DSP）。所提出的算法基于简单的矢量种子，从而有可能获得所有的脉宽调制（PWM）模式。

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