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Title: 240$$^\circ$$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Journal Article · · IEEE Open Journal of Power Electronics
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Arizona State Univ., Tempe, AZ (United States)
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Transformerless voltage source inverters (VSIs) are one of the popular topologies for photovoltaic (PV) grid-connected applications due to the lowest component count and simple design. Because of the absence of galvanic isolation in such systems, problem of electromagnetic interference (EMI) due to high leakage current is highly pronounced. Recently various reduced common mode voltage (CMV) PWM (RCMV-PWM) methods which address these issues of CMV, and leakage current have been proposed. These schemes typically function at the expense of increased total harmonic distortion (THD), higher switching loss, high DC link current stress along with limited modulation index range. In this work, 240 ° clamped PWM (240CPWM) is selected as an ideal candidate for grid connected VSIs in terms of all round performance of switching loss, THD, DC link current stress, CMV and leakage current. 240CPWM is a relatively new space vector based PWM method which can attain much superior performance by avoiding the zero states. After a brief overview of the 240CPWM concept, the paper provides a detailed comparison of 240CPWM with conventional space vector PWM (CSVPWM) and discontinuous PWM (DPWM1) methods in terms of each of the above metrics. A 3-phase 208 V 3 kW silicon IGBT based hardware prototype is built to validate the performance of 240CPWM and compared with other popular schemes under grid-connected mode. Experimental results show a 66.7% reduction in the peak CMV and 50% reduction in leakage current with the proposed scheme as compared to CSVPWM. Also, THD, DC link current stress and inverter switching loss are greatly reduced as an added advantage using the proposed method. A new, combined performance index is proposed to compare the performance of different PWM schemes, and it is shown that the 240CPWM achieves the best value for this index among the PWM methods studied.

Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0008773
OSTI ID:
1860292
Alternate ID(s):
OSTI ID: 1860293; OSTI ID: 1963766
Journal Information:
IEEE Open Journal of Power Electronics, Vol. 3; ISSN 2644-1314
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

References (39)

Three-Phase Filter-Clamped Transformerless Inverter for Grid-Connected Photovoltaic Systems with Low Leakage Current journal January 2020
Suppression of Common-Mode Voltage Using a Multicentral Photovoltaic Inverter Topology With Synchronized PWM journal September 2014
Performance evaluation of single-phase transfomer-less PV inverter topologies conference March 2018
Common-Mode Voltage Reduction Pulsewidth Modulation Techniques for Three-Phase Grid-Connected Converters journal April 2013
Three-Phase Two-Phase-Clamped Boost-Buck Unity Power Factor Rectifier Employing Novel Variable DC Link Voltage Input Current Control conference November 2018
New Modulation Techniques for a Leakage Current Reduction and a Neutral-Point Voltage Balance in Transformerless Photovoltaic Systems Using a Three-Level Inverter journal April 2014
A Transformerless Grid-Connected Photovoltaic System Based on the Coupled Inductor Single-Stage Boost Three-Phase Inverter journal March 2014
Comprehensive Analysis and Experimental Validation of 240$^\circ$-Clamped Space Vector PWM Technique Eliminating Zero States for EV Traction Inverters With Dynamic DC Link journal December 2020
Analysis of a Synergetically Controlled Two-Stage Three-Phase DC/AC Buck-Boost Converter journal March 2020
A Review of Single-Phase Grid-Connected Inverters for Photovoltaic Modules journal September 2005
Solar energy: Potential and future prospects journal February 2018
A Dynamic Boost Converter Input Stage for a Double 120° Flattop Modulation Based Three-Phase Inverter conference October 2008
A three-phase voltage-source solar power conditioner using a single-phase PWM control method conference September 2009
Space Vector Pulsewidth Amplitude Modulation for a Buck–Boost Voltage/Current Source Inverter journal January 2014
Switching loss analysis of a three-phase solar power conditioner using a single-phase PWM control method conference September 2010
Modulation Techniques to Eliminate Leakage Currents in Transformerless Three-Phase Photovoltaic Systems journal April 2010
Transformer-Less Grid Feeding Current Source Inverter for Solar Photovoltaic System journal October 2014
Three-Phase Quasi-Z-Source Inverter With Constant Common-Mode Voltage for Photovoltaic Application journal June 2018
A Novel Scalar PWM Method to Reduce Leakage Current in Three-Phase Two-Level Transformerless Grid-Connected VSIs journal May 2020
Performance Analysis of Reduced Common-Mode Voltage PWM Methods and Comparison With Standard PWM Methods for Three-Phase Voltage-Source Inverters journal January 2009
Optimal Common-Mode Voltage Reduction PWM Technique for Inverter Control With Consideration of the Dead-Time Effects—Part I: Basic Development journal November 2004
Reduction of Bearing Currents in Inverter Fed Drive Applications by Using Sequentially Positioned Pulse Modulation journal November 2004
Reduction of common-mode currents in PWM inverter motor drives journal January 1999
A Near-State PWM Method With Reduced Switching Losses and Reduced Common-Mode Voltage for Three-Phase Voltage Source Inverters journal January 2009
H8 Inverter to Reduce Leakage Current in Transformerless Three-Phase Grid-Connected Photovoltaic systems journal June 2018
Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies journal September 2009
Grid-Connected Photovoltaic Systems: An Overview of Recent Research and Emerging PV Converter Technology journal March 2015
Transformerless Photovoltaic Inverters Connected to the Grid conference February 2007
Eliminating Ground Current in a Transformerless Photovoltaic Application journal March 2010
Mitigation of DC and Harmonic Currents Generated by Voltage Measurement Errors and Grid Voltage Distortions in Transformerless Grid-Connected Inverters journal June 2018
A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems journal January 2017
Leakage Current Attenuation of a Three-Phase Cascaded Inverter for Transformerless Grid-Connected PV Systems journal January 2018
Space-Vector-Based Hybrid Pulsewidth Modulation Techniques for Reduced Harmonic Distortion and Switching Loss journal March 2010
Integral‐series Fourier analysis of chaotic PWM patterns for common mode voltage stresses journal August 2018
Analytical calculation of the RMS current stress on the DC-link capacitor of voltage-PWM converter systems journal January 2006
Analytical Evaluation of Harmonic Distortion in PWM AC Drives Using the Notion of Stator Flux Ripple journal March 2005
High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation journal May 2014
Performance Analysis and Experimental Validation of 240°-Clamped Space Vector PWM to Minimize Common Mode Voltage and Leakage Current in EV/HEV Traction Drives journal March 2022
Hybrid SVPWM Scheme to Minimize the Common-Mode Voltage Frequency and Amplitude in Voltage Source Inverter Drives journal February 2019

Figures / Tables (33)

FIGURE 1(p. 3)figure FIGURE 1
FIGURE 2(p. 3)figure FIGURE 2
FIGURE 3(p. 4)figure FIGURE 3
FIGURE 4(p. 4)figure FIGURE 4
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FIGURE 7(p. 5)figure FIGURE 7
FIGURE 8(p. 6)figure FIGURE 8
TABLE 1(p. 6)table TABLE 1
TABLE 2(p. 7)table TABLE 2
TABLE 3(p. 7)table TABLE 3
TABLE 4(p. 7)table TABLE 4
FIGURE 10(p. 8)figure FIGURE 10
FIGURE 11(p. 8)figure FIGURE 11
FIGURE 12(p. 8)figure FIGURE 12
FIGURE 9(p. 8)figure FIGURE 9
FIGURE 13(p. 9)figure FIGURE 13
FIGURE 14(p. 9)figure FIGURE 14
FIGURE 15(p. 10)figure FIGURE 15
FIGURE 16(p. 10)figure FIGURE 16
TABLE 5(p. 10)table TABLE 5
FIGURE 17(p. 11)figure FIGURE 17
FIGURE 18(p. 11)figure FIGURE 18
FIGURE 19(p. 11)figure FIGURE 19
TABLE 6(p. 11)table TABLE 6
TABLE 7(p. 11)table TABLE 7
FIGURE 20(p. 12)figure FIGURE 20
FIGURE 21(p. 12)figure FIGURE 21
FIGURE 22(p. 12)figure FIGURE 22
FIGURE 23(p. 13)figure FIGURE 23
FIGURE 24(p. 13)figure FIGURE 24
FIGURE 25(p. 14)figure FIGURE 25
TABLE 8(p. 14)table TABLE 8

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14 SOLAR ENERGY
24 POWER TRANSMISSION AND DISTRIBUTION
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
240° clamped PWM (240CPWM)
common mode voltage (CMV)
leakage current
photovoltaic (PV)
pulse width modulation (PWM)
voltage source inverter (VSI)
switching loss