Indonesian Journal of Electrical Engineering and Computer Science Vol. 38, No. 3, June 2025, pp. 1411~1421 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v38.i3.pp1411-1421  1411 Journal homepage: http://ijeecs.iaescore.com A new modified B4 inverter using SRF controller with SVPWM technique for grid-connected PV system Golkonda Anitha 1 , Krishnaveni Kondreddi 2 , Guduri Yesuratnam 3 1 Department of Electrical Engineering, University College of Engineering, Osmania University, Hyderabad, India 2 Department of Electrical and Electronics Engineering, Chaitanya Bharathi Institute of Technology, Hyderabad, India 3 Department of Electrical Engineering, UCE, Osmania University, Hyderabad, India Article Info ABSTRACT Article history: Received May 3, 2024 Revised Nov 19, 2024 Accepted Nov 24, 2024 The integration of renewable power sources into the grid presents a complex challenge, as the grid operates at AC voltage, while photovoltaic (PV) arrays generate DC power. A 3-phase inverter synchronizes with the grid’s voltage and frequency for efficient energy integration. In conventional technique, a 3-ph 6-switch (B6) inverter is used for sharing the power to the grid. In this paper reduced switch count 3-ph 4-switch (B4) inverter topology is introduced with reduced power losses. This topology has 4 insulated gate bipolar transistor (IGBT) switches and two capacitors replacing the other 2 switches positioned in one leg of the inverter, which connects to a grid- connected PV system. A grid synchronization method called synchronous reference frame (SRF) based proportional integral (PI) is used to track the phase angle of the grid and subsequently inject current into the grid. A B4 inverter is operated by a novel space vector pulse width modulation (SVPWM) control technique which operates in 4 possible switching states. A comparative analysis is carried out with the PV array grid integration connected through B4 and B6 inverter topologies with SRF control. The modeling and design are carried out in a MATLAB/Simulink environment with graphs plotted according to the conditions. The comparative analysis validates the importance of SRF controllers for the grid integration of any renewable source. Keywords: DC-DC boost converter IGBT Modified B4 inverter Photovoltaic Proportional integral SVPWM Synchronous reference frame This is an open access article under the CC BY-SA license. Corresponding Author: Golkonda Anitha Department of Electrical Engineering, University College of Engineering, Osmania University Hyderabad, India Email: mahanitha2006@gmail.com 1. INTRODUCTION Renewable source penetration into the grid has become a mandatory requirement for load compensation using natural resources [1]. Renewable power is the only solution to the current day problem of global warming and climatic shift. Most of the power generation plants use fossil fuels like coal, diesel, and uranium, which create a carbon print on the planet. The fumes and discharge from these sources lead to climatic disasters creating unlivable conditions for the beings on the planet. It is high time to shift the power generation to renewable sources that have zero emissions. Sharing renewable power to the grid is a critical task as the natural sources (solar irradiation, winds) are unpredictable [2]. Of all the available renewable sources, solar power generation is considered to be the most flexible and easy to install. Solar power generation involves photo voltaic panels connected in different combinations of parallel and series sets forming a photovoltaic array (PVA) [3]. The accumulated powers from each panel are considered to be the total power of the PVA. The PVA generates power in DC voltage which needs to be