An Improved Phase-Shifted-Carrier Technique for Hybrid Modular Multilevel Converter With Boosted Modulation Index
An Improved Phase-Shifted-Carrier Technique for Hybrid Modular Multilevel Converter With Boosted Modulation Index
复制标题
具有提升调制指数的混合模块化多电平变换器的改进相移载波技术
DOI：
10.1109/tpel.2019.2921202
复制
发表时间：
2020-02
影响因子：
6.7
通讯作者：
Jiabing Hu
中科院分区：
文献类型：
--
作者：
Chen Xu;Lei Lin;Tianxiang Yin;Jiabing Hu
移相载波（PSC）技术是首选的多电平变流器在中压应用与低子模块（SM）的数量。这种技术可以提高等效开关频率，从而降低总谐波失真。然而，对于半/全桥混合模块化多电平变换器（MMC）与升压调制指数，传统的PSC方法是无效的，由于不对称的电压参考波。SM电容电压偏离额定值，臂电压和等效交流电压中出现低于等效开关频率的谐波。本文介绍了一种改进的PSC技术与电容排序算法，以克服这个问题。参考波的负部分被翻转，然后乘以校正因子。三角形载流子在上下臂之间的角位移由每臂半桥数的奇偶性决定。该方法使电容电压平衡，MMC的交流电压谐波失真最小。对该方法进行了双傅立叶分析，揭示了其谐波特性。实验结果验证了调制指数提高和参考波形不对称的混合MMC的改进PSC技术的正确性和可行性。
The phase-shifted-carrier (PSC) technique is preferred for multilevel converters in medium-voltage applications with low submodule (SM) number. This technique can elevate the equivalent switching frequency resulting in low total harmonic distortions. However, for half-/full-bridge hybrid modular multilevel converter (MMC) with boosted modulation index, the conventional PSC method is invalid due to the asymmetric voltage reference wave. The SM capacitor voltages deviate from the rated value and harmonics below equivalent switching frequency appear in the arm and equivalent ac voltages. This paper introduces an improved PSC technique with a capacitor sorting algorithm to overcome this problem. The negative part of the reference wave is turned over and then multiplied by a correction factor. The angular displacement for triangular carriers between the upper and lower arms is determined by the parity of the half-bridge number per arm. With the proposed method, the capacitor voltages are balanced and the ac voltage of MMC has the lowest harmonic distortion. Double-Fourier analysis for the proposed technique is carried out, and harmonic characteristics are revealed. The experimental results validate the correctness and feasibility of the improved PSC technique for hybrid MMC with boosted modulation index and asymmetric reference wave.
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