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Power quality improvement of solar photovoltaic transformer-less grid-connected system with maximum power point tracking control
Authors:Akhil Gupta  Saurabh Chanana  Tilak Thakur
Affiliation:1. Department of Electrical Engineering, National Institute of Technology, Kurukshetra, India;2. Department of Electrical Engineering, PEC University of Technology, Chandigarh, India
Abstract:This paper presents a transformer-less single-stage grid-connected solar photovoltaic (PV) system with active reactive power control. In the absence of active input power, grid-tied voltage source converter (VSC) is operated in the reactive power generation mode, which powers control circuitry and maintains regulated DC voltage. Control scheme has been implemented so that the grid-connected converter continuously serves local load. A data-based maximum power point tracking (MPPT) has been implemented at maximum power which performs power quality control by reducing total harmonic distortion (THD) in grid-injected current under varying environmental conditions. Standards (IEEE-519/1547) stipulates that current with THD greater than 5% cannot be injected into the grid by any distributed generation (DG) source. MPPT tracks actual variable DC link voltage while deriving maximum power from PV array and maintains DC link voltage constant by changing the converter modulation index. Simulation results with the PV model and MPPT technique validations demonstrate effectiveness of the proposed system.
Keywords:photovoltaic  MPPT  THD  power  control
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