A Pulse Width Modulation technique for reducing switching frequency for modular multilevel converter | IEEE Conference Publication | IEEE Xplore

A Pulse Width Modulation technique for reducing switching frequency for modular multilevel converter


Abstract:

In this paper, a Pulse Width Modulation (PWM) technique for modular multilevel converter has been explored. The PWM technique is implemented using carrier based level shi...Show More

Abstract:

In this paper, a Pulse Width Modulation (PWM) technique for modular multilevel converter has been explored. The PWM technique is implemented using carrier based level shifted PWM strategy. It does not necessitate the calculation of duty cycles, and can be easily implemented in a DSP. With the proposed technique, harmonics in the phase voltage is shifted to twice the switching frequency. Thus, the devices of the converter can be switched at a reduced switching frequency to maintain the same output voltage quality. A detailed explanation of the carrier based level shifted PWM for implementing the proposed technique is included in the paper. This is verified by computer simulation on a 6.6 kV, 6 MW drive system.
Date of Conference: 28-30 January 2011
Date Added to IEEE Xplore: 10 March 2011
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Conference Location: New Delhi, India

I. Introduction

THE Modular Multilevel Converter (MMC) is a new topology of multilevel converter [1]–[3], which has gained wide attention in recent times (Figs. 1 and 2). The concept has been commercially implemented in HVDC applications as HVDC PLUS by a major manufacturer [4]. There are many attractive features of this converter, which are suitable for high power applications [1], [2]. The modular structure, advantage of easy scalability and a possibility of using redundant cells for fault tolerant applications are some of the key features of this converter. The output voltage quality of the MMC is almost close to sinusoidal, thereby putting minimum requirements on the design of the output filter. Many research works have been published in recent times highlighting the advantages of this converter for high power drive applications [5]–[9]. Modular Multilevel Converter One cell of the Modular Multilevel Converter

References

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