The efficiency of wide-bandgap (WBG) power converters can be greatly improved using high-frequency modulation techniques. This article proposes using single-loop and double-loop hexagonal sigma-delta (H- $\Sigma \Delta$ and DH- $\Sigma \Delta$ , respectively) modulations for voltage source converters (VSC) that use silicon carbide (SiC) semiconductors. These allow high switching frequencies to operate more efficiently than silicon devices. Thus, $\Sigma \Delta$ modulations are excellent candidates for taking advantage of WBG devices. The proposed modulation techniques allow working with a variable switching frequency, thus producing an extreme reduction in switching losses and mitigating the low-order harmonics in comparison with the classical space vector pulsewidth modulation (SVPWM) technique, and with the innovative variable switching frequency pulse-width modulation (VSFPWM). The performance and losses of both $\Sigma \Delta$ techniques are analyzed here using MATLAB/Simulink and PLECS, and then compared with SVPWM and VSFPWM. Furthermore, the frequency spectrum and the total harmonic distortion are evaluated. Experimental results performed on a VSC converter that uses SiC MOSFET s show how H- $\Sigma \Delta$ and DH- $\Sigma \Delta$ greatly improve efficiency and generate fewer low-order harmonics than the SVPWM and VSFPWM strategies do.

中文翻译：

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基于宽带隙半导体的三相高频VSC的六方Σ-Δ调制综合分析

使用高频调制技术可以大大提高宽带隙（WBG）功率转换器的效率。本文建议使用单环和双环六角形sigma-delta（H- $ \ Sigma \ Delta $ 和DH- $ \ Sigma \ Delta $ 分别针对使用碳化硅（SiC）半导体的电压源转换器（VSC）进行调制。这些允许高开关频率比硅器件更有效地工作。从而，$ \ Sigma \ Delta $调制是利用WBG设备的绝佳候选者。与经典的空间矢量脉冲宽度调制（SVPWM）技术以及创新的可变开关频率脉冲相比，所提出的调制技术允许在可变开关频率下工作，从而极大地降低了开关损耗并降低了低阶谐波。宽度调制（VSFPWM）。两者的表现和损失$ \ Sigma \ Delta $本文使用MATLAB / Simulink和PLECS对这些技术进行了分析，然后与SVPWM和VSFPWM进行了比较。此外，评估频谱和总谐波失真。在使用SiC的VSC转换器上进行的实验结果场效应管 s显示H- $ \ Sigma \ Delta $ 和DH- $ \ Sigma \ Delta $ 与SVPWM和VSFPWM策略相比，极大地提高了效率并产生了更少的低阶谐波。