Volume 16, Issue 4 (December 2020)                   IJEEE 2020, 16(4): 513-523 | Back to browse issues page

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Ahmadzadeh T, Babaei E, Sabahi M, Abedinzadeh T. An Improved Transformerless Grid-Connected PV System With Related Control Strategy to Reduce Leakage Current, Extract Maximum Power Point and Control Power. IJEEE 2020; 16 (4) :513-523
URL: http://ijeee.iust.ac.ir/article-1-1528-en.html
An Improved Transformerless Grid-Connected PV System With Related Control Strategy to Reduce Leakage Current, Extract Maximum Power Point and Control Power
T. Ahmadzadeh , E. Babaei , M. Sabahi , T. Abedinzadeh
Abstract:   (3388 Views)
The main purposes of a transformerless grid-connected photovoltaic (PV) system consist of the reduction of leakage current, extraction of maximum power point (MPP), tracking of MPP (MPPT), controlling the active and reactive powers, and having the unity power factor. To achieve the above-mentioned aims, the following actions have been performed in this paper. First of all, a brief analysis of the transformerless PV system has been done by using the conventional full-bridge (FB) topologies with two bipolar and unipolar PWM techniques. Then, an effective solution has been also introduced to significantly reduce the leakage current in the conventional H5 FB topology. Moreover, a proper control method has been proposed by using the combination of the fractional open-circuit voltage (FOCV) and the model predictive control (MPC) strategies to extract the MPP from PV panels, control the injection of the reactive power to the gird and have the unity power factor. At last, the simulation results performed in PSCAD software will be used to prove the correct performance of the proposed control method in the improved H5 FB topology.
Keywords: Full Bridge (FB) Inverter , H5 FB Topologies , Leakage Current , Pulse Width Modulation (PWM) Techniques , Bipolar PWM (BPWM) Modulation , Unipolar PWM (UPWM) Modulation , Maximum Power Point (MPP) Tracking [MeSH], Model Predictive Control (MPC) Strategy
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  • In this paper, to reduce the leakage current in a grid-connected photovoltaic (PV) system, an improved unipolar PWM (UPWM) Modulation is proposed.
  • To extract the maximum power point, the model predictive control (MPC) strategy is applied.
  • Moreover, a study about the grid-connected PV system by using the conventional full-bridge inverters with two bipolar and unipolar PWM techniques has been done in this paper.
  • a new control method is proposed.
  • To prove the correct performance of H6 FB topology with the MPC technique and the proposed control method for achieving the MPP, the simulation results performed in PSCAD software will be used.

Type of Study: Research Paper | Subject: Converters
Received: 2019/06/20 | Revised: 2019/10/01 | Accepted: 2019/10/04
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© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.