Scholarly article on topic 'Simulation Analysis of Three Level Diode Clamped Multilevel Inverter Fed PMSM Drive Using Carrier Based Space Vector Pulse Width Modulation (CB-SVPWM)'

Simulation Analysis of Three Level Diode Clamped Multilevel Inverter Fed PMSM Drive Using Carrier Based Space Vector Pulse Width Modulation (CB-SVPWM) Academic research paper on "Electrical engineering, electronic engineering, information engineering"

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Keywords
{"Permanent magnet synchronous motor (PMSM)" / "diode clamped multilevel inverter(DCML)" / "space vector pulse width modulation (SVPWM)" / "carrier-based space vector pulse width modulation (CBSVPWM)."}

Abstract of research paper on Electrical engineering, electronic engineering, information engineering, author of scientific article — R.G. Shriwastava, M.B. Daigavane, P.M. Daigavane

Abstract This paper proposes implementation of Three Level Diode-Clamped Multilevel inverter using IGBT's fed PMSM drive. The pulses for the inverters have been developed by using Carrier based Space Vector Pulse Width Modulation Technique (CB-SVPWM). Carrier based Space Vector Pulse Width Modulation Technique is most prominent PWM technique for three phase voltage source inverters for the control of Permanent Magnet Synchronous Motors. The output voltages, currents, torque & speed characteristics have studied for three-level inverters fed PMSM drive. It has observed three -level inverter with Carrier based Space Vector Pulse Width Modulation Technique (CB-SVPWM) can use more DC link voltage as compare to Space Vector Pulse Width Modulation Technique (SVPWM). and also CB-SVPWM Technique utilizes DC bus voltage more efficiently and generates less harmonics.

Academic research paper on topic "Simulation Analysis of Three Level Diode Clamped Multilevel Inverter Fed PMSM Drive Using Carrier Based Space Vector Pulse Width Modulation (CB-SVPWM)"

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Procedia Computer Science 79 (2016) 616 - 623

7th International Conference on Communication, Computing and Virtualization 2016

Simulation Analysis of Three Level Diode Clamped Multilevel Inverter Fed PMSM Drive Using Carrier Based Space Vector Pulse Width Modulation (CB-SVPWM)

R.G.Shriwastava0*, M. B. Daigavane6, P. M. Daigavanec

a Department of Electrical Engineering, B.D. College of Engineering, Sevagram, Wardha, India. b G.H.Raisoni Institute of Engineering & Technology India for Women, Nagpur c G.H Raisoni. College of Engineering, Nagpur, India

Abstract

This paper proposes implementation of Three Level Diode-Clamped Multilevel inverter using IGBT's fed PMSM drive. The pulses for the inverters have been developed by using Carrier based Space Vector Pulse Width Modulation Technique (CB-SVPWM). Carrier based Space Vector Pulse Width Modulation Technique is most prominent PWM technique for three phase voltage source inverters for the control of Permanent Magnet Synchronous Motors. The output voltages, currents, torque & speed characteristics have studied for three-level inverters fed PMSM drive. It has observed three -level inverter with Carrier based Space Vector Pulse Width Modulation Technique (CB-SVPWM) can use more DC link voltage as compare to Space Vector Pulse Width Modulation Technique (SVPWM). and also CB-SVPWM Technique utilizes DC bus voltage more efficiently and generates less harmonics.

© 2016 The Authors.PublishedbyElsevierB.V. This isanopenaccess articleundertheCCBY-NC-ND license (http://creativecommons.Org/licenses/by-nc-nd/4.0/).

Peer-review under responsibility of the Organizing Committee of ICCCV 2016

Keywords: Permanent magnet synchronous motor (PMSM); diode clamped multilevel inverter(DCML); space vector pulse width modulation (SVPWM); carrier-based space vector pulse width modulation (CBSVPWM).

1877-0509 © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.Org/licenses/by-nc-nd/4.0/).

Peer-review under responsibility of the Organizing Committee of ICCCV 2016 doi : 10.1016/j .procs. 2016.03.078

1. Introduction

The most attractive applications of the Multilevel power conversion technology are in the medium- to highvoltage range (2-13 kV), and include motor drives, power distribution, power quality and power conditioning applications. In general, multilevel power converters can be viewed as voltage synthesizers, in which the high

* Corresponding author : E-mail address: rakesh_shriwastava@rediffmail.com.

output voltage is synthesized from many discrete smaller voltage levels. The selection of the best topology of multilevel inverter and the best control method for each given application are unspecified and is subject to different engineering tradeoffs. By concentrating on the DC/AC multilevel inverter power conversion technologies that do not require power regeneration, several attractive topological, modulation and power semiconductor device choices present themselves [1]-[4]. The highly developed multilevel inverter topologies are

• Diode Clamped

• Flying Capacitor

• Cascade Full Bridge

The Modulation strategies are classified as Fundamental Frequency Switching

• Pulse Width Modulation

• Sinusoidal Pulse Width Modulation (SPWM)

• Space Vector Pulse Width Modulation (SVPWM)

• Carrier Based Space Vector Pulse Width Modulation (CB-SVPWM)

In low power and low voltage drive applications ,the two-level inverter configuration has attracted attention where as in high power high performances voltage drive applications ,three-level inverter configuration has attracted more attention as compared to two-level inverter configuration . The objective of these two-level and three-level inverter configuration is to provide a three phase voltage source, where the amplitude, phase, and frequency of the voltages should always be controllable. The two-level inverter is consists of only one switching cell per phase but the three-level inverter has two switching cell per phase. Three level DCMLI is most favorable among the various multi level configuration. Using enough levels the multi-level inverter generates approximately a sinusoidal voltage waveform with very low harmonic distortion [2]-[6]. With the availability of high speed power semi conductor devices the harmonic contents of output voltage can be minimized or reduced significantly by switching techniques like Carrier Based space vector pulse width modulation (CB-SVPWM). Compared to the conventional SVPWM this method is simpler and avoids complex trigonometric calculations.

In this paper the analysis of three-level diode clamped multilevel inverters has simulated using IGBT's , pulses for the switches has simulated using CB-SVPWM technique and the output of these inverters are fed to Permanent Magnet Synchronous Motor. A Torque & Speed characteristic of PMSM has been studied [4].

2. Diode clamped multilevel inverter configuration

This circuit converts the available ac line voltage into required dc voltage for the Three level Diode clamped Inverter. It uses four diode Di, D2, D3 and D4 in bridge configuration as shown in fig. 1 Diode bridge converts ac to dc. This dc voltage is not pure dc voltage but contains ac ripples in it. So capacitor is connected across the output of the bridge rectifier which filters out ac contained in the dc and gives almost pure dc voltage. Figure 1 shows the Power circuit of three level diode clamped inverter (DCMLI)

fed PMSM drive, where only one DC source Vd is needed. Two capacitors are used to split the DC voltage and provide a neutral point N. The inverter leg A is composed of four active switches Sal, Sa2, Sa3 and Sa4 with two anti-parallel diodes D1 to D4.The switches are employed with 12 IGBT's .Switching states for three-level inverter are shown in Table I. For one leg operation of phase-A for a three-level diode clamped inverter, to have a output voltage of Vdc/2 the switches Sal, Sa2 should conduct and to have -Vdc/2 voltage, the switches Sa3. Sa4 should conduct and to have output voltage as zero the switches Sa2, Sa3 should conduct. For each voltage level two switches should conduct at a time. The maximum output voltage in the output is half of the DC source.

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Fig. 1 Power circuit of three level diode clamped inverter (DCMLI) fed PMSM drive Table 1. Switching sequences for three-level diode clamped inverter

Sector Voltage Switching State

Vector Sa1 Sa2 Sa3 Sa4 Sb1 Sb2 Sb3 Sb4 Sc1 Sc2 Sc3 S

1 V1 1 1 0 0 0 0 1 1 0 0 1 1

2 V2 1 1 0 0 0 1 1 0 0 0 1 1

3 V3 1 1 0 0 1 1 0 0 0 0 1 1

4 V4 0 1 1 0 1 1 0 0 0 0 1 1

5 V5 0 0 1 1 1 1 0 0 0 0 1 1

6 V6 0 0 1 1 1 1 0 0 0 1 1 0

7 V7 0 0 1 1 1 1 0 0 1 1 0 0

8 V8 0 0 1 1 0 1 1 0 1 1 0 0

9 V9 0 0 1 1 0 0 1 1 1 1 0 0

10 V10 0 1 1 0 0 0 1 1 1 1 0 0

11 V11 1 1 0 0 0 0 1 1 1 1 0 0

12 V12 1 1 0 0 0 0 1 1 0 1 1 0

3. CB-SVPWM configuration for three-level inverter

Carrier based SVPWM allow fast and efficient implementation of SVPWM without sector determination. The technique is based on the duty ratio profiles that SVPWM exhibits By comparing the duty ratio profile with a higher frequency triangular carrier the pulses can be generated, based on the same arguments as the sinusoidal pulse width modulation.

Fig.2.Block diagram of CBSVPWM 4. Mathematical model of PMSM

The mathematical model of a Permanent magnet synchronous motor is identical to that of cylindrical rotor synchronous motor. The rotor of synchronous motor is replaced with high resistivity PM material. Hence, induced current in the rotor are nearly equal to zero. The permanent magnets on the rotor are shaped in such a way as to produce sinusoidal back EMF in stator windings.

The PMSM model equations are:

Vd =RId +Ld(dId/dt)-ProLqIq (1)

Vq=RIq +Lq(dIq/dt)+ProLdId + P<»Xf (2)

Te =Tl + Bra +Jm(dro/dt) (3)

Te =KtIq +(3/2)P (Ld -Lq)IdIq (4) For SMPM, the direct & quadrature components of the inductances are the same.

Hence Te =KIq (5)

Kt =(3/2)P Xf (6)

From the above equation (5) the torque producing current is along the quadrature-axis. To reach maximum efficiency, the torque per ampere relationship should be maximum. This can be easily obtained by keeping the direct-axis current to zero at all times. Where

R is the stator resistance. ,Vd- direct axis voltage.,Vq- quadrature-axis voltage.,,Id- direct axis current. ,Iq- quadrature-axis current.,,Ld-- direct axis inductance, Lq - quadrature-axis. Inductance.- rotor rotational speed permanent magnet flux. ,Te- electromagnetic torque.

5. Simulation results and analysis

The simulation of three level diode clamped IGBT inverter fed PMSM electrical drive system is investigated. Two modulation techniques have been applied to the three level diode clamped IGBT inverter. The system used was investigated for steady state. The output waveforms of SVPWM and CBSVPWM are shown in fig.5 to fig.9.The THD analysis of line voltage current of three level diode clamped inverter (DCMLI) using SVPWM& CB-SVPWM.are shown in fig.10 & fig.11.

The parameters used in this simulation are shown in below:

Ld=0.006365; Lq=0.006365; R=1.6; PM_flux=0.1852; P=2; F=0.00005396; J=0.0001854

Fig.3. Simulation model of three level diode clamped inverter (DCMLI) fed PMSM drive with SVPWM.

Fig.4. Simulation model of three level diode clamped inverter (DCMLI) fed PMSM drive with CB-SVPWM.

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Fig.5. Output line voltage of three level diode clamped inverter (DCMLI) (a) SVPWM,(b)CB-SVPWM.

Fig.9. Three phase Stator current of three level diode clamped inverter (DCMLI) fed PMSM drive (a) SVPWM,(b)CB-SVPWM.

Fig .10.Determination of THD of line voltage of three level diode clamped inverter (DCMLI) (a) SVPWM,(b)CB-SVPWM.

Fig . 1 l.Determination of THD of line current of three level diode clamped inverter (DCMLI) (a) SVPWM,(b)CB-SVPWM. Table3 Comparison of THD for voltage and currents using, SVPWM, CB-SVPWM.

THD SVPWM CB-SVPWM

Line Voltage 10.89% 10.04%

Line Current 2.33% 0.73%

7. Conclusion

In this paper, the simulation model of three-level diode clamped inverter fed PMSM drive using two different modulation techniques has studied. The output voltage, current of the inverter and the speed, torque and the

three-phase currents of the PMSM for SVPWM and CB-SVPWM have plotted. From the analysis we can conclude that the CBSVPWM is similar to SVPWM but much simple, easy and the fastest method without much mathematical calculations like angle and sector determination as in SVPWM. This method can be easily extended to n-level inverter. THD of voltage and current also reduces which is shown in table3.

References

[1] Aneesh, M.A.S., Gopinath.A, Baiju.M.R. " A Simple Space Vector PWM Generation Scheme for Any General n-Level Inverter "Vol.56, issue-5, Industrial Electronics, IEEE Transactions, pp.1649-1656, May- 2009.

[2] Gupta.G.K, Khambadkone.A.M.," A Space Vector PWM Scheme for Multilevel Inverters Based on Two-Level Space Vector PWM " vol.53, issue-5,Industrial Electronics, IEEE Transactions,0ct.2006.

[3] "Pulse width modulation for power converters" principles and practice by D. Grahame Holmes and Thomas A. L

[4] "Multilevel inverters: a survey of topologies, controls, and applications" by José Rodriguez, Jih-Sheng Lai, and Fang Zheng Peng 1999 IEEE paper.

[5] Multilevel converters for large electric drives" by Leon M. Tolbert, Fang Zheng Peng, and Thomas G. Habetler.

[6] "Fault diagnosis system for a multilevel inverter using a neural network" by Surin Khomfoi & Leon M. Tolbert.

[7]. Jang-Hwan Kim, Seung-Ki Sul and Prasad N. Enjeti, [2005]" A Carrier-Based PWM Method with Optimal Switching Sequence for a Multi-level Four-leg VSI,"IEEE Conference Publication,PP:99-105.

[8]. Keliang Zhou and Danwei Wang,[2002] "Relationship Between Space-Vector Modulation and Three-Phase Carrier-Based PWM: A Comprehensive Analysis," IEEE Transactions on Industrial Electronics, Vol. 49, No. 1,PP:186-195.

[9]. Wenxi Yao, Haibing Hu, and Zhengyu Lu, [2008]"Comparisons of Space-Vector Modulation and Carrier-Based Modulation of Multilevel Inverter,"IEEE Transactions on Power Electronics, Vol. 23,No. 1, PP: 45-51

AUTHORS BIOGRAPHY

Mr. Rakesh Shriwastava obtained the B.E.Degree in Power Electronics Engineering from Nagpur University,India in 1994. He received the M.E.Degree in Control Engineering from Walchand college of Engineering,Sangli, (MS) India in 2007 & Pursuing the Ph.D.degree in Electrical Engineering from Nagpur University,Nagpur Since 2011 He is currently Working as Associate Professor & Head,in Electrical Engineering Department of Bapurao Deshmukh College of Engineering, Sewagram(Wardha).His research interests include analysis and control of electrical drives, particularly in hybrid and electric vehicle applications. He is a Life Member of the Indian Society for technical Education.

Dr.Manoj.B.Daigavane obtained the B.E. Degree in Power Electronics Engineering from Nagpur University,India in 1988. He received the M.S.Degree in Electronics and Control Engineering from Birla Institute of Technology and Science, Pilani (Raj) India in 1994.He also obtained the M.E. Degree in Power Electronics Engineering from Rajeev Gandhi University of Technology, Bhopal (M.P), India in 2001. He received

Ph D Degree in Electrical Engineering from RTM Nagpur University, India in 2009. Since Sept.1988- June 2007, he had been with the Department of Electronics and Power Electronics Engineering, B. D. College of Engineering, Sewagram (Wardha), affiliated to the Nagpur University, India. Since July 1, 2007 to Apr 30, 2009, he was Professor & Head of Electrical and Electronics Engineering, Disha Institute of Mgmt. and Tech., Raipur (C.G.) where he is engaged in teaching & research. He had been Principal of S.D College of Engineering, Selukate,Wardha, Maharashtra (India), since May 01,2009 to July 15, 2013. He had been Principal of Vidarbha Institute of Technology, Nagpur ,Maharashtra (India), since July 16, 2013 to Jan 31, 2015. Presently, he is Principal of G.H.Raisoni Institute of Engineering & Technology for Women, Nagpur,- Maharashtra (India), since Feb.1,2015. His main areas of interest are resonant converters, Power quality issues, DSP applications and Power electronics for motor drives. He is a Member of the Institution of Engineers (India) and a Life Member of the Indian Society for technical Education.

Dr.Mrs.Prema.M.Daigavane obtained the B.E. Degree in Electrical Engineering from Amravati University, India in 1988. She received the M.S.Degree in Electronics and Control Engineering from Birla Institute of Technology and Science, Pilani (Raj) India in 1996.She received Ph D Degree in Elecronics Engineering from RTM Nagpur University, India in 2013. Since August 1988- June 2007, she had been with the Department of Electronics and Power Electronics Engineering, B. D. College of Engineering, Sewagram (Wardha), affiliated to the Nagpur University, India. Since July 1, 2007 to Apr 30, 2009, she was Professor of Electrical and Electronics Engineering, Disha Institute of Mgmt. and Tech., Raipur (C.G.) affiliated to the Chhattisgarh Swami Vivekananda Technical University, Bhilai India.Where she is engaged in teaching & research. she was Professor & Head of Electronics/Electronics&Communication Engineering at Sursesh Deshmukh College of Engineering, Wardha -Maharashtra (India), since May , 2009 to June 2013. Presently, she is Professor & Head Electrical Engineering at G.H.Raisoni College of Engineering (Autonomous Institute) Nagpur - Maharashtra (India), since June2013,. Her main areas of interest are microprocessors & microcontrollers based system design, image processing & intelligent transportation. She is a Member of the Institution of Engineers (India) and a Life Member of the Indian Society for technical Education.