A new capacitor voltage balancing control for hybrid modular multilevel converter with cascaded full bridge

2016 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2016-03-20 DOI:10.1109/APEC.2016.7468192

M. Ghat, A. Shukla, Richa Mishra

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引用次数: 6

Abstract

Recently, a hybrid modular multilevel converter with cascaded full bridges (HMMC-CFB) is proposed. This converter has mainly two parts: a director part (DP) and a wave shaping part (WSP). The DP consists of a conventional modular multilevel converter (MMC) with half bridge submodules (HBS). The WSP is a series connection of full bridge submodules (FBS) and attenuates the voltage harmonics produced by DP. The energy exchanged by WSP changes with modulation index and causes improper capacitor voltage regulation. For satisfactory operation of HMMC-CFB, the total capacitor voltage of WSP should remain constant. This paper presents an analysis of energy exchanged by WSP and proposes a new control technique to regulate the total dc voltage of WSP. In the proposed control, the energy exchanged by WSP is controlled by changing the slope of the voltage reference signal of DP. In addition, analysis of circulating current of HMMC-CFB is presented. A circulating current suppressing controller (CCSC) is used to control the second harmonic component. The performance of the proposed control technique for the standalone model of HMMC-CFB is evaluated by using time domain simulation studies in the PSCAD software environment. To test fault blocking capability of converter, a grid connected model is built in PSCAD and analyzed for dc fault tolerant capability.

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级联式全桥混合模块多电平变换器的电容电压平衡控制

近年来，提出了一种带级联全桥的混合模块化多电平变换器(hmc - cfb)。该变换器主要由两部分组成:导波部分(DP)和整形部分(WSP)。DP由传统的模块化多电平转换器(MMC)和半桥子模块(HBS)组成。WSP是全桥子模块(FBS)的串联连接，并衰减DP产生的电压谐波。WSP交换的能量随调制指数的变化而变化，导致电容器电压调节不当。为了使hmc - cfb运行满意，WSP的总电容电压应保持恒定。本文分析了WSP的能量交换，提出了一种新的控制技术来调节WSP的直流总电压。在该控制中，通过改变DP参考电压信号的斜率来控制WSP交换的能量。此外，还对hmc - cfb的循环电流进行了分析。循环电流抑制控制器(CCSC)用于控制二次谐波分量。通过PSCAD软件环境下的时域仿真研究，对所提出的hmc - cfb独立模型控制技术的性能进行了评价。为了测试变流器的故障阻塞能力，在PSCAD中建立了并网模型，并对其直流容错能力进行了分析。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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