Low Frequency Ripple Reduction in Input DC Current and AC Line Currents With 240$^{\circ }$ Clamped Space Vector PWM in Grid-Connected Photovoltaic Converters

Qamar, Hafsa; Qamar, Haleema; Korada, Nikhil; Ayyanar, Rajapandian

doi:10.1109/OJPEL.2023.3279924

Title: Low Frequency Ripple Reduction in Input DC Current and AC Line Currents With 240$$^{\circ }$$ Clamped Space Vector PWM in Grid-Connected Photovoltaic Converters

Journal Article · Sun Jan 01 00:00:00 EST 2023 · IEEE Open Journal of Power Electronics

DOI:https://doi.org/10.1109/OJPEL.2023.3279924· OSTI ID:1984718

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Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore, Pakistan
Dhanani School of Science and Engineering, Habib University, Karachi, Pakistan
School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ, USA

240°-Clamped Space Vector PWM (240CPWM) is a lowest switching loss PWM method in cascaded architecture of DC-DC stage followed by DC-AC stage that reduces the switching loss by 85% in the DC-AC stage at unity power factor as compared to conventional space vector PWM (CSVPWM). 240CPWM requires unique six-pulse dynamically varying DC link voltage instead of constant DC link voltage which introduces low frequency harmonics predominantly around six times the fundamental frequency (6f₁). These low frequency harmonics distort the input DC current and AC line currents. Moreover, they change the operating point of maximum power point tracking (MPPT), reducing the efficiency of grid-connected Photovoltaic (PV) converter. In this article, three topologies are proposed to reduce the low frequency ripple in input DC current and AC line currents in three-phase grid-connected PV systems with 240CPWM. A three-phase 1.5 kW Silicon Carbide based hardware prototype in grid-connected mode is developed to validate the performance of the proposed topologies. Experimental results show that the maximum reduction of 68.8% in (6f₁) harmonic component in DC input current is achieved in active filter based Topology II without any significant detrimental effect on THD in AC line currents and inverter efficiency as compared to standard topology.

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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

Grant/Contract Number:: EE0008773

OSTI ID:: 1984718

Alternate ID(s):: OSTI ID: 1984691; OSTI ID: 1984720

Journal Information:: IEEE Open Journal of Power Electronics, Journal Name: IEEE Open Journal of Power Electronics Vol. 4; ISSN 2644-1314

Publisher:: Institute of Electrical and Electronics EngineersCopyright Statement

Country of Publication:: United States

Language:: English

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14 SOLAR ENERGY
Photovoltaic (PV)
grid-connected converter
low frequency harmonics
DC input current
240◦-Clamped Space Vector PWM (240CPWM)
dynamic DC link
Total Harmonic Distortion (THD)

Title: Low Frequency Ripple Reduction in Input DC Current and AC Line Currents With 240$$^{\circ }$$ Clamped Space Vector PWM in Grid-Connected Photovoltaic Converters

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