Comparative Study on Carrier Overlapping PWM Strategies for Five Level Diode Clamped Inverter

Abstract

Keywords: dSPACE, DCMLI, PWM, COPWM, CFD. IntroductionMultilevel inverter has drawn tremendous interest in high power applications because it has many advantages: it can realize high voltage and high power output through the use of semiconductor switches without use of transformer and without dynamic voltage balance circuits. When the number of output levels increases, harmonics of the output voltage and current as well as Electro Magnetic Interference (EMI) decrease. Behera et al [1] described the harmonic analysis of the stepped output of the three level inverter based on number of triangular carriers and a sinusoidal modulating signal. The use of multilevel approach is believed to be a promising alternative in very high power conversion processing [2,8]. Chaturvedi et al [3] presented simulation studies on different control techniques for three and five level DCMLI. The performance of each technique has been investigated based upon reduction in THD. Many investigators [4,10,13] have proposed carrier based multilevel sine triangle PWM schemes for control of a DCMLI used in a motor drive and in a static VAR compensator. Multilevel converters are rapidly emerging as viable alternatives for high power drives. A generalized circuit topology of multilevel voltage source inverter is proposed in [5]. Aquila et al [6] presented a digital implementation of DCMLI employing a fast microprocessor and logic circuits. Multilevel voltage source inverters have recently become very popular in applications using renewable energy sources such as fuel cell, photovoltaic cell and biomass etc [7]. The idea of control degrees of freedom combination and the validity of the PWM strategies are demonstrated by simulation and experimentation of three and five level inverters by Hongyan Wang et al [9]. This is based on a direct extension of three level inverter to higher level. Newton et al [11] discussed the control requirements for three and five level inverters.

Energy enhancement in grid-connected photovoltaic generation systems using adaptive control technique

“…The Real-time monitoring of RES connected to the grid is vital for Active Distribution System (ADS) operation and control [8][9][10][11]. This work develops the ADS state rating framework for integrating photovoltaic power plants, taking into account the comprehensive photovoltaic (PV) system model and environmental impact factors [12,13].…”

Performance Evaluation of Multi Carrier Based PWM Techniques for Single Phase Five Level H-Bridge Type FCMLI

“…Nami et al [5] have presented a hybrid cascade converter topology with series connected symmetrical and asymmetrical diode clamped H-bridge cells. Shanthi and Natarajan [6] have carried out comparative study on carrier overlapping PWM strategies for five level flying capacitor inverter. Porselvi and Muthu [7] have also compared cascaded H-bridge, neutral point clamped and flying capacitor multilevel inverters using multicarrier PWM.…”

Comparative Study of Unipolar Multicarrier PWM Strategies for Five Level Diode Clamped Inverter

“…Sambath et al [11] discussed a new modulation strategy for a single phase five level H-bridge type DCMLI with reduced components as compared to conventional DCMLI. Shanthi and Natarajan [12] presented the comparison of Carrier Overlapping Pulse Width Modulation (COPWM) techniques for the Diode clamped Multi Level Inverter (DCMLI) and also discussed the use of Control Freedom Degree (CFD) combination. A comparative study on various unipolar PWM strategies for single phase five-level cascaded inverter is described in [13].…”