Comparative Analysis of Harmonic Distortion of a Solar PV Fed Cascaded H-bridge Multilevel Inverter Controlled by FPGA and Diode Clamped Inverter

Category: Electronics | Posted by SUBHASHINI | Posted on November 24, 2017

Project Files

  1. The objective of the project is to design CASCADED H-BRIDGE INVERTER using simulink with switches triggered by SPWM scheme by employing solar photo voltaic system implemented using FPGA resulting in new alternate energy that competes the disadvantages of conventional energy sources. It also reduces switching losses and total harmonic distortion by increasing output voltage levels. Various topologies having studied and came out with the designing of seven level cascaded-h-bridge inverter using field programmable array. Sinusoidal Pulse Width Modulation Scheme is employed to control multilevel inverter, to reduce switching and conduction losses and also to reduce Total Harmonic Distortion by increasing the levels at output voltage waveform. In this project a seven level cascaded-h-bridge three phase inverter is simulated using MATLAB SIMULINK. The model has been simulated and its output voltage and current waveforms are studied. A cascaded three phase inverter uses 12 switches arranged as four switches in each H section. Above the neutral point line are two switches and below the line are two switches. Two capacitors are used across the main DC source and these two capacitors split the DC source voltage into providing an additional potential point called the neutral point. The operation of the inverter was studied in the MATLAB environment and the spectral studies were also carried out and recorded in this report. Inspired by the large number of ports, reduced coding complexity, speed and modularity the field programmable gate array will be used for the development of the hardware for this application. Thus by computing switching angles for various modulation indexes proved that the range of modulation index between 0.53 to 0.78 resulting in reduced total harmonic distortion value of 32%.

Reference Papers

Morrison AJ. Global demand projections for renewable energy resources. IEEE Canada Electrical Power Conference; 2007 Oct 25-26. p. 537. 3. Carrasco JM, Franquelo LG, Bialasiewicz JT, Galvan E, Guisado RCP, Prats MaAM, Leon JI, Moreno-Alfonso N. Power-electronic systems for the grid integration of renewable energy sources: a survey. IEEE Transactions on Industrial Electronics. 2006 Jun; 53(4):1002–16. 4. Tolbert LM, Peng FZ. Multilevel converters as a utility interface for renewable energy systems. IEEE Power Engineering Society Summer Meeting; 2000 Jul 15-20; Seattle, Washington. 5. Busquets-Monge S, Rocabert J, Rodriguez P, Alepuz S, Bordonau J. Multilevel diode-clamped converter for photovoltaic generators with independent voltage control of each solar array. IEEE Transactions on Industrial Electronics. 2008 Jul; 55:2713–23. 6. Khomfoi S, Tolbert LM. Multilevel power converters. Power Electronics Handbook. 2nd ed. Elsevier; 2007. p. 451–82.

Used Software/Hardware

matlab simlink

Description

The objective of the project is to design CASCADED H-BRIDGE INVERTER using simulink with switches triggered by SPWM scheme by employing solar photo voltaic system implemented using FPGA resulting in new alternate energy that competes the disadvantages of conventional energy sources. It also reduces switching losses and total harmonic distortion by increasing output voltage levels. Various topologies having studied and came out with the designing of seven level cascaded-h-bridge inverter using field programmable array. Sinusoidal Pulse Width Modulation Scheme is employed to control multilevel inverter, to reduce switching and conduction losses and also to reduce Total Harmonic Distortion by increasing the levels at output voltage waveform. In this project a seven level cascaded-h-bridge three phase inverter is simulated using MATLAB SIMULINK. The model has been simulated and its output voltage and current waveforms are studied. A cascaded three phase inverter uses 12 switches arranged as four switches in each H section. Above the neutral point line are two switches and below the line are two switches. Two capacitors are used across the main DC source and these two capacitors split the DC source voltage into providing an additional potential point called the neutral point. The operation of the inverter was studied in the MATLAB environment and the spectral studies were also carried out and recorded in this report. Inspired by the large number of ports, reduced coding complexity, speed and modularity the field programmable gate array will be used for the development of the hardware for this application. Thus by computing switching angles for various modulation indexes proved that the range of modulation index between 0.53 to 0.78 resulting in reduced total harmonic distortion value of 32%.

 

 

 

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