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FPGA based Implementation of Symmetrical Reduced Switch Multilevel Inverter K. Venkataramanan; B. Shanthi; T. S. Sivakumaran
International Journal of Reconfigurable and Embedded Systems (IJRES) Vol 6, No 1: March 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.071 KB) | DOI: 10.11591/ijres.v6.i1.pp28-35

Abstract

Multilevel inverter has become more popular and attractive for drive applications. Among the various modulation techniques, Carrier based techniques has been commonly used because of their simplicity and flexibility. This paper presents the comparisons of bipolar multicarrier pulse width modulation for the new symmetrical multilevel inverter. The performance parameters of new multilevel inverter were analyzed through various switching strategies. The detailed study has been carried out by MATLAB/SIMULINK. The real time implementation was carried out using FPGA. The results of both simulation and experimentation were compared.
Analysis of Binary DC Source Reduced Switch 7-level Inverter V. Arun; B. Shanthi; M. Arumugam
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 1: March 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (172.574 KB) | DOI: 10.11591/ijpeds.v6.i1.pp70-76

Abstract

This paper proposes a binary DC source reduced switch 7-level inverter. Binary DC source reduced switch inverter is triggered by the Unipolar PWM strategy having sinusoidal and trapezoidal reference with triangular carriers. These Pulse Width Modulating (PWM) strategies include Phase Disposition (PD), Alternate Phase Opposition Disposition (APOD), Carrier Overlapping (CO). Performance factors like Total Harmonic Distortion (THD), VRMS (fundamental) and crest factor are evaluated for various modulation indices. Simulations were performed using MATLAB-SIMULINK. It is observed that UPDPWM strategy with trapezoidal reference provides output with relatively low distortion and UCOPWM strategy with trapezoidal reference provides relatively higher fundamental RMS output voltage.
Simulation and dSPACE Based Implementation of Various PWM Strategies for A New H-Type FCMLI Topology Chinnapettai Ramalingam Balamurugan; S.P. Natarajan; T.S. Anandhi; B. Shanthi
International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 6, No 3: September 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (436.167 KB) | DOI: 10.11591/ijpeds.v6.i3.pp615-624

Abstract

Depending on the number of levels in output voltage, inverters can be divided into two categories: two level inverter and Multi Level Inverters (MLIs). An inverter topology for high voltage and high power applications that seems to be gaining interest is the MLI. In high power and high voltage applications, the two level inverters have some limitations in operating at high frequency mainly due to switching losses and constraints of device rating.In this paper, a three phase H + type FCMLI (Flying Capacitor MLI) using sinusoidal reference, third harmonic injection reference, 60 degree reference and stepped wave reference are initially developed using SIMULINK and then implemented in real time environment using dSPACE. In H-type FCMLI with R-load it is inferred that bipolar COPWM-C provides output with relatively low distortion for 60 degree reference and bipolar COPWM-C strategy is found to perform better since it provides relatively higher fundamental RMS output voltage for THI reference. The five level output voltages of the chosen MLIs obtained using the MATLAB and dSPACE based PWM (Pulse Width Modulation) strategies and the corresponding %THD (Total Harmonic Distortion), VRMS (fundamental), CF (Crest Factor) and FF (Form Factor) are presented and analyzed.
Simulation and Real Time Implementation of Various PWM Strategies for 3 Φ Multilevel Inverter Using FPGA C. R. Balamurugan; S. P. Natarajan; T. S. Anandhi; B. Shanthi
International Journal of Reconfigurable and Embedded Systems (IJRES) Vol 6, No 1: March 2017
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1165.178 KB) | DOI: 10.11591/ijres.v6.i1.pp1-19

Abstract

For high power applications Multilevel Inverter (MLI) is extensively used. The major advantages of MLI are good power quality, low switching losses and maintenance of the desired voltage. In this work, the three phase cascaded multi level inverter is analyzed under various modulation techniques that include Sub-Harmonic Pulse Width Modulation (SHPWM) i.e. Phase Disposition (PD) strategy, Phase Opposition Disposition (POD) strategy, Alternate Phase Opposition Disposition (APOD) strategy, hybrid strategy (PD and PS) and Phase Shift (PS) strategy. The study will help to choose those techniques with reduced harmonics for the chosen three phase cascaded MLI with R-L load. The Total Harmonic Distortion (THD), VRMS (fundamental), crest factor and form factor are evaluated for various modulation indices at two different switching frequencies (3.15KHz and 6 KHz). Simulation is performed using MATLAB-SIMULINK. It is observed that HYBRID PWM and PSPWM methods provide output with relatively low distortion for low and high switching frequencies. PODPWM and PSPWM are found to perform better since they provide relatively higher fundamental RMS output voltage for 6 KHz and 3.15 KHz switching frequencies. The experimental result shows PSPWM provide output with low distortion and HYBRID PWM provide output with higher fundamental RMS voltage for fc=3.15KHz. The experimental results were obtained only for fc=3.15KHz.
Three Phase Trinary Source MLI Using Multicarrier SPWM Strategies T. Sengolrajan; B. Shanthi; M. Arumugam
Indonesian Journal of Electrical Engineering and Computer Science Vol 13, No 3: March 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents a comprehensive analysis of various bipolar Multicarrier Pulse Width Modulation (MCPWM) strategies with Sinusoidal reference for three phase Nine level Trinary Source cascaded  inverter.  A new approach of nine levels is for medium voltage applications. The proposed topology uses reduced number of switching devices and thus reducing losses and low THD in comparison with the conventional topology. The configuration of the circuit is simple and easy to control. Performance factors such as %THD, VRMS where measured and Crest Factor (CF), Distortion Factor (DF), Form Factor (FF) of output voltage were calculated for different modulation indices and the results were compared. VFPWM strategies provides minimum THD and COPWM strategy provides higher fundamental VRMS output voltage. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7181 
A Nine Level Cascaded Multi Level Inveter Using Embedded and FlipFlops Chinnapettai Ramalingam Balamurugan; S.P. Natarajan; T.S. Anandhi; B. Shanthi
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 1: July 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper proposes a nine level cascaded multilevel inverter based on the flip flops and logic gates. Generally multilevel inverter is used to achieve the high power by using a series of power semiconductor switches with the several dc voltage sources which is used to perform the power conversion. In this paper the flip flop based CMLI is compared with the conventional CMLI. The flip flops and logic gates are used to create logic equation for the each switch of the CMLI by using the switching states. This proposed topology is mainly used to reduce the total harmonic distortion and also increase the performance of the system. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.7978
A Review on Modulation Strategies of Multi Level Inverter Chinnapettai Ramalingam Balamurugan; S.P. Natarajan; R. Bensraj; B. Shanthi
Indonesian Journal of Electrical Engineering and Computer Science Vol 3, No 3: September 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v3.i3.pp681-705

Abstract

This review develop different switching methods for Multi Level Inverter (MLI). The switching methods proposed in this paper are to compare various methods and to predict exact switching method for different application based upon its quality of the outputs.  The performance of the inverter is analyzed with the parameters like THD (Total Harmonic Injection), VRMS (fundamental), CF (Crest Factor), FF (Form Factor) and DF (Distortion Factor). From the various non PWM (Pulse Width Modulation) and PWM methods the analysis are method to identify the exact PWM strategies for specific applications.