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Comparative Study of H-Bridge Multi Level Inverters
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1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 717 COMPARATIVE STUDY OF H-BRIDGE MULTI LEVEL INVERTERS S.Srinivasa Rao1, Dr. CH. V. V. S. Bhaskara Reddy2 1PG Student, A.U. College of Engineering (A), Dept. Electrical Engg., A.P, India 2Professor, A.U. College of Engineering (A), Dept. Electrical Engg., A.P, India. ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Now a days, usage of the power electronic devices for conversion of electric power from DC-AC conversion or vice-versa increased drastically because of advantages with power electronic converters. But, due to the switching actions involved in conversion of DC-AC, the output waveforms are having discontinuous wave shapes. Thesewavesconsistsofnot only fundamental component but also the harmonics w.r.t. to fundamental wave. The control of the switches in all inverters are using PWM technique to get uniqueness in comparison. This work analyses the Harmonic content in the output wave using Fast Fourier Transform (FFT) when 2KVA at u.p.f., load is connected. Also analysis the output active, reactive power delivered to load when some fault occurs in the conversion process like battery source disconnected, oneoftheswitchfails to operate, etc. In all the cases the harmonic content in the output wave in the 5-level ,7-level,9-level and 11-level inverters and compared the results with each other. The comparison will be carried out by using FFT analysis in MATLAB/SIMULINK software. Power loss, voltage transients also calculated across the each switch when the load is at u.p.f. in the 5-level ,7-level,9-level and 11-level inverter and compares the results. Calculation of power loss, design of heat sink for proper dissipation of heat are also considered. Whereas the OFF state voltage across the switch to design the size of the switch. Key Words: Comparison, power loss, Analysis of active power, PWM technique, Cascaded H-Bridge, Voltage transients. 1.INTRODUCTION In power converters, energy conversion is a function of switching states of the converter. Based on the application, power converters with optimal modulationtechniquesneed to be identified and developed to deliver maximum output power. This research work aims at comparing the output voltages, Total Harmonic Distortion (THD), predominant harmonics of a single phase cascaded multilevel inverter of various levels and validating the performanceoftheinverter as using PWM switching control technique. The main objectives of this research work are, to study, the calculation of pulse width and duty ratios of switches in Multi-Level Inverters and implement PWM strategies with cascaded multilevel inverter based on control degrees of freedom combinations and to obtain Total Harmonic Distortion in each Level of CHB based inverter it helps to design the physical filters based on the harmonics exist. 2. FIVE LEVEL INVERTER In this inverter, two H-bridges are connected as cascadeand two DC sources of 150 v each are connected to each bridge. And 8 switches IGBT switches with individual gate control. Simulation Figure 2.1 simulation of five level inverter Fig 2.1 shows the 5 level inverter and its duty ratio depends on the pulses produced by the pulse generator. Inverter consists of two legs, in each leg two IGBT switches are connected back to back. Output of pulse generator is connected to each switch and NOT gate output is connected to the another switch which is placed on same leg. 2.1 LOAD AT U.P.F: At unity power factor, the 2kva is connected at load terminals for analyzing the performance of inverter. At load terminals the active power transmitted from the source is 1814w at fundamental frequency. Reactive power transmitted from source is zero. Figure2.2 shows the waveforms of voltage, current and apparent power at load terminals. Voltage and current wave forms in stepped in nature. It consists of five level voltage magnitudes 0v, 150v, 300v, -150v, -300v.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 718 Figure 2.2 output waveforms of Five level inverter at u.p.f. FFT analysis RMS value of Output voltage is 193.8 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency is 184.7v. And the waveform consists of 31.52%(THD) at fundamental frequency. The predominant harmonics are3rd-24.48%, 5th- 5.60% 7th-3.57% and th-8.00%. Fundamental RMS current 9.835A. 2.1.1 Power loss across switches Average power loss can be calculated by multiplying the voltage across and current through the switch . The figure 2.3 shows the waveforms of powerloss,voltageandcurrents in a switch. Each switch causes the power loss of 0.225W And in Five level inverter 8 no's of switches are used .So total average power loss in the bridge circuit is 1.8w. we conclude that the average power loss is same for all the power factors. Figure 2.3 power loss across switch Off state voltage Voltage across the switch when it is in OFF 150v i.e. the switch capable to withstand this voltage during turn off state. The forward break over voltage should be more than this voltage to avoid automatic turn on. Figure 2.3 showsthe voltage transients across the switch. 2.1.2 One battery source disconnected Figure 2.4 shows the apparent (active, reactive) powers delivered to load, when the battery is disconnectedfromone of its bridge. In both cases the power can be transmitted from another Even though the battery removed or suddenly disconnected from the bridge there is continuity ofpower to the load with reduction in power. In this case active power drawn by the load is 725 w and reactive power is zero. Figure 2.4 waveforms when one battery source disconnected FFT analysis RMS value of Output voltage is 122.3 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 116.7 v. And the waveform consists of 30.54%(THD) at fundamental frequency. The predominant harmonics are 5th-20.10%,7th- 14.19% and 11th-9.00%. Fundamental RMS current 6.221 A. 2.1.3 Switch failed to turn on If the pulse generator failed to generate the gate pulse to IGBT or IGBT failed to turn on, in both the cases IGBT will not turn on. In this circumstancesanalyzeparametersatload terminals like output voltage, currents and harmonics. The active power delivered to load is 848 w. Figure 2.5 the output voltage, current, apparent poweratoutputterminals. Figure 2.5 Output waveforms when switch failed to turn on FFT analysis The RMS value of Output voltage is 150.2 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency (50 HZ) is 126.3
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 719 v. And the waveform consists of 50.44%(THD) at fundamental frequency.The predominantharmonicsareDC- 28.1%, 2nd-23.1%,3rd-35.71%, 4th-11.52% and 5th- 1.11%. 3 SEVEN LEVEL INVERTER In this inverter, three H-bridges are connected as cascade and three equal DC sources of 100 v each(namely dc1, dc2, dc3) are connected to each bridge, and 12 switches IGBT switches with individual gate control. Simulation Figure3.1 Simulation of seven level inverter Fig 3.1 shows the seven level inverter and its duty ratio depends on the pulses produced by the pulse generator. Inverter consists of two legs , in each leg two IGBT switches are connected back to back. With same configuration seven level inverter consists of3bridges.Outputofpulsegenerator is connected to each switch and NOT gate output is connected to the another switch whichisplacedonsameleg. 3.1 LOAD:2KVA@UPF At unity power factor, the 2kva is connected at load terminals for analyzing the performance of inverter. At load terminals the active power transmitted from the source is 1879w at fundamental frequency. Reactive power transmitted from source is zero. Voltage and current wave forms in stepped in nature. It consists of 7 voltage magnitudes 0v, 100v, 200v, 300v, -100v,-150v,-300v.Figure 3.3 shows the voltage levels of inverter. Figure 3.2 output waveforms of Seven level inverter at u.p.f. FFT analysis RMS value of Output voltage is 187 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency is 181.3v. And the waveform consists of 25.47 %(THD) at fundamental frequency. The predominant harmonics are 3rd-20.67%, 5th- 1.65% 7th-4.25% and 9th- 3.31%.Fundamental RMS current 10.37 A. 3.1.1 Power loss across switches Average power loss can be calculated by multiplying the voltage across and current throughtheswitch.Thefigure3.3 the waveforms of power loss, voltage and currents in a switch. Each switch causes the power loss of 0.1w and in Seven level inverter 12 no's of switches are used .So total average power loss in the bridge circuit is 1.2w.Weconclude that the average power loss is same for all the powerfactors. Figure 3.3 power loss across switch Off state voltage Voltage across the switch when it is in OFF 100v i.e. the switch capable to withstand this voltage during turn off state. The forward break over voltage should be more than this voltage to avoid automatic turn on. Figure 3.3 showsthe voltage transients across the switch. 3.1.2 One battery source disconnected Figure 3.4 shows the apparent (active, reactive) powers delivered to load, when the battery is disconnectedfromone of its bridge. In both cases the power can be transmitted from another Even though the battery removed or suddenly disconnected from the bridge there is continuity ofpower to the load with reduction in power. In this case active power drawn by the load is 550w. and reactive power is zero. FFT analysis RMS value of Output voltage is 115.2v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 98.2v. And the waveform consists of 54.38%(THD) at fundamental
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 720 frequency. The predominant harmonics are 3rd-49.80%,5th- 3.91%,7th-4.23%and9th-3.32%.Fundamental RMS current 6.221 A. Figure 3.4 waveforms when one battery source disconnected 3.1.3 Switch failed to turn on If the pulse generator failed to generate the gate pulse to IGBT or IGBT failed to turn on, in both the cases IGBT will not turn on. In this circumstancesanalyzeparametersatload terminals like output voltage, currents and harmonics. The active power delivered to load is 1116w. Figure 3.5 the output voltage, current,apparentpoweratoutputterminals. Figure3.5 Waveforms of seven level inverter (one switch fail) FFT analysis The RMS value of Output voltage is 154 v i.e.itconsistsof DC, fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 139v. And the waveform consists of 37.82%(THD) at fundamental frequency. The predominant harmonics areDC-18.98%,2nd- 11.36%, 3rd-30.84% and4th-8.05%. 4. NINE LEVEL INVERTER In this inverter, three H-bridges are connected as cascade and three equal DC sources of 75 v each are connected to each bridge, and 16 switches IGBT switches with individual gate control. Simulation Figure 4.1 Simulation of nine level inverter Figure 4.1 shows the nine level inverter and its duty ratio depends on the pulses produced by the pulse generator. Inverter consists of two legs , in each leg two IGBT switches are connected back to back. With same configuration nine level inverter consists of4bridges.Outputofpulsegenerator is connected to each switch and NOT gate output is connected to the another switch whichisplacedonsameleg. Figure 4.2 output waveforms of Nine level inverter at u.p.f. 4.1 LOAD:2KVA@UPF At unity power factor, the 2kva is connected at load terminals for analyzing the performance of inverter. At load terminals the active power transmitted from the source is 1908w at fundamental frequency. Reactive power
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 721 transmitted from source is zero. Voltage and current wave forms in stepped in nature. It consists of 9 voltage magnitudes 0v, 75v, 150v, 225v, 300v, -75v, -150v, - 225v, - 300v.Figure 4.2 shows the voltage levels of inverter. FFT analysis RMS value of Output voltage is 183.6 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency is 179.3 v. And the waveform consists of 21.84 %(THD) at fundamental frequency. The predominant harmonics are 3rd-18.50%, 7th-4.40% and 9th- 1.76%. Fundamental RMS current10.65 A. 4.1.1 Power loss across switches Average power loss can be calculated by multiplying the voltage across and current through the switch . The figure shows the waveforms of power loss, voltage and currents in a switch. Each switch causes the power loss of0.056wand in nine inverter 16 no's of switches are used .So total average power loss in the bridge circuit is 0.7w.We conclude that the average power loss is same for all the power factors. Off state voltage Voltage across the switch when it is in OFF 75v i.e. the switch capable to withstand this voltage during turn off state. The forward break over voltage should be more than this voltage to avoid automatic turn on. Figure 4.3 showsthe voltage transients across the switch. 4.1.2 One battery source disconnected Figure 4.4 shows the apparent (active, reactive) powers delivered to load, when the battery is disconnected to one of its bridge. In both cases the power can be transmitted from another Even though the battery removed or suddenly disconnected from the bridge there is continuity ofpower to the load with reduction in power. In this case active power drawn by the load is 786.5w. and reactive power is zero. Figure 4.3 switching transients across the switch Figure4.4 waveforms of nine level inverter (one battery disconnected) FFT analysis RMS value of Output voltage is 125.4v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 115.2v. And the waveform consists of 43.05%(THD) at fundamental frequency. The Predominant Harmonicsare3rd-40.35%, 7th- 1.43 % and 9th- 3.43 %.Fundamental RMS current 6.8 A. 4.1.3 Switch failed to turn on Figure 4.5 waveforms of nine level inverter (one switch fail) If the pulse generator failed to generate the gate pulse to IGBT or IGBT failed to turn on, in both the cases IGBT will not turn on. In this circumstancesanalyzeparametersatload terminals like output voltage, currents and harmonics. The active power delivered to load is 1286w. Figure 4.5 shows the output voltage, current, apparent power at output terminals. FFT analysis The RMS value of Output voltage is 154 v i.e.itconsistsof DC, fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 139v. And the waveform consists of 28.97%(THD) at fundamental frequency. The predominant harmonics are DC-11.78 %,2nd 11.36%, 3rd-30.84% and4th-8.05%.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 722 5. ELEVEN LEVEL INVERTER In this inverter, three H-bridges are connected as cascade and three equal DC sources of 60 v each are connected to each bridge, and 16 switches IGBT switches with individual gate control. Simulation Figure 5.1 Simulation of nine level inverter Figure 5.1 shows the eleven level inverter and its duty ratio depends on the pulses produced by the pulse generator. Inverter consists of two legs , in each leg two IGBT switches are connected back to back. With same configuration eleven level inverter consists of4bridges.Outputofpulsegenerator is connected to each switch and NOT gate output is connected to the another switch whichisplacedonsameleg. 5.1 LOAD:2KVA@UPF Figure 5.2 Output waveforms of eleven level inverter at u.p.f. At unity power factor, the 2kva is connected at load terminals for analyzing the performance of inverter. At load terminals the active power transmitted from the source is 1921w at fundamental frequency. Reactive power transmitted from source is zero. Voltage and current wave forms in stepped in nature. It consists of 11 voltage magnitudes 0v, 60v, 120v, 180v, 240v, 300v, -60v, -120v, 180v, -240v, -300v.Figure 5.2 shows the voltage levels of inverter. FFT analysis RMS value of Output voltage is 181.5 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency is 178.1 v. And the waveform consists of 19.59%(THD) at fundamental frequency. The predominant harmonics are 3rd- 17.15 % and7th-3.64 % .Fundamental RMS current 10.8 A. 5.1.1 Power loss across switches Average power loss can be calculated by multiplying the voltage across and current through the switch . The figure 5.3 shows the waveforms of powerloss,voltageandcurrents in a switch. Each switch causes the power lossof0.036wand in eleven inverter 20 no's of switches are used .So total average power loss in the bridge circuit is 0.648w.We conclude that the average power loss is same for all the power factors. Off state voltage Voltage across the switch when it is in OFF60vi.e.theswitch capable to withstand this voltage during turn off state. The forward break over voltage should be morethanthisvoltage to avoid automatic turn on. Figure 5.3 shows the voltage transients across the switch. Figure 5.3 Voltage transients across switch 5.1.2 One battery source disconnected Figure 5.4 Waveforms of eleven level inverter (one battery disconnected)
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 723 Figure 5.4 shows the apparent (active, reactive) powers delivered to load, when the battery is disconnectedfromone of its bridge. In both cases the power can be transmitted from another Even though the battery removed or suddenly disconnected from the bridge there is continuity ofpower to the load with reduction in power. In this case active power drawn by the load is 960w. and reactive power is zero. FFT analysis RMS value of Output voltage is 134v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 125.9v. And the waveform consists of 36.42%(THD) at fundamental frequency. The Predominant Harmonics are 3rd-34.48 %, 5th 1.15% and 7th- 3.73 %.Fundamental RMS current 7.635 A. 5.1.3 Switch failed to turn on Figure 5.5 waveforms of eleven level inverter (one switch fail) If the pulse generator failed to generate the gate pulse to IGBT or IGBT failed to turn on, in both the cases IGBT will not turn on. In this circumstancesanalyzeparametersatload terminals like output voltage, currents and harmonics. The active power delivered to load is 1399w. Figure 5..5 the output voltage, current,apparentpoweratoutputterminals. FFT analysis The RMS value of Output voltage is 159.5 v i.e. it consists of DC , fundamental and harmonics of voltages. The RMS value of output voltage at fundamental frequency(50 HZ) is 152v. And the waveform consists of 27.22%(THD) at fundamental frequency. The predominant harmonics are DC-11.50 %, 2nd-4.38%, 3rd-24.32%, 4th -8.05% and 6th-2.95%.Figure 3.56 shows the % magnitude of harmonics w.r.t. to fundamental frequency. 6. CONCLUSIONS 6.1 FOLLOWING ARE THE CONCLUSIONS DRAWN FROM THE PRESENT STUDY As the level increases the Apparent (Active, Reactive ) power transmitted at load increases at fundamental frequency, i.e., at 5 -level, 11- level active power loads are 1814w, 1921w respectively at unity power factor. Total Harmonic Distortion (THD) are 5-level, 7-level , 9- level , 11- level are 31.52%, 25.47%, 21.84% and 19.58% respectively. Concluded that THD decreases and power transmission increases with level of conversion at unity power factor. Magnitude of 3rd harmonic (predominant one) content in five level- 24.48%, seven level-20.67%, nine level-18.50% and eleven level- 17.15%.Predominantharmonicmagnitude decreases as the level increases. As the level increases the lower order harmonic content decreases , it is consideration of design the filter. Size of filter is low for 11 level converter. Power loss in the switch for five level is 0.225w and total power loss is 1.8w, seven level power loss is 0.1w and total loss 1.2w , nine level power loss 0.056w and total loss0.7w and for eleven level power loss in each switch is 0.036w and total loss 0.648w. concluded that power loss also decreases in 11 level compared to five level inverter. Power loss is same in all inverters for any power factors. Proper heat dissipation methods need to be consider for five level because the power loss is high. Voltage across each switch during off state for five level:150v, seven level:100v, ninelevel:75v,elevenlevel:60v. From above concluded that , the voltage across eleven level inverter is low. The size of the switch used in this inverter is low. 6.2 SCOPE FOR FURTHER STUDY The present work can be extended by increasing number of levels, so that Total Harmonic Distortion (THD), magnitude of harmonics decreasesand apparentpower(active,reactive power) transmission increases at fundamental frequency. REFERENCES [1]. J.S. Lai and F. Z. Peng, “Multilevel Converters - A new breed of Power converters", IEEE Transactions on Industry Application, Volume 32, May June 1996. [2]. Power quality improvement in transmission systems using facts devices Published in: Green Engineering and Technologies (IC-GET), 2016 Online International Conference on Coimbatore, India 19-19 Nov. 2016. [3]. L. M. A. Beigi, L. M. A. Beigi, F. Khosravi "A new multilevel inverter topology with reduced number of power switches" Published in: Power and Energy
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 04 Issue: 10 | Oct -2017 www.irjet.net p-ISSN: 2395-0072 © 2017, IRJET | Impact Factor value: 5.181 | ISO 9001:2008 Certified Journal | Page 724 (PECon),2012 IEEE International Conference on 2- 5Dec.2012. [4]. llhami Colak, Ersan Kabalci, Ramazan Bayindir"Review of multi-level source inverter topologies and control schemes"published in Energy Conversion and Management in 2011. [5]. M. Bashi, N. Mariun, N.F. Mailah and S. Alhalali, 2008. Low Harmonics Single Phase Multilevel Power Inverter. Asian Journal of Scientific Research, 1: 274- 280. [6]. Lakhan Kumar Gupta, K. T. Chaturvedi, Bhoopendra Singh, Toshi Sharma,Jayadeep Srikakolapu," Simulation of a Cascade Connected H–Bridge Five level Inverter",2014IEEE International conference onMOOC, Innovation and technology in Education (MITE)
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