International Journal of Power Electronics and Drive Systems (IJPEDS) Vol. 13, No. 1, March 2022, pp. 488~499 ISSN: 2088-8694, DOI: 10.11591/ijpeds.v13.i1.pp488-499  488 Journal homepage: http://ijpeds.iaescore.com Impact of on-grid solar energy generation system on low voltage ride through capability Mohammad Ahmad Shawqi 1 , Mokhtar Hussien Abdallah 2 , Ibrahim Ahmed Nassar 3 1 Research and Planning Department, Ministry of Electricity and Renewable Energy, Cairo, Egypt 2 Developing Performance and Political Communication Unit, Ministry of Electricity and Renewable Energy, Cairo, Egypt 3 Electrical Power and Machines Engineering Department, Al Azhar University, Cairo, Egypt Article Info ABSTRACT Article history: Received Jul 14, 2021 Revised Jan 24, 2022 Accepted Jan 31, 2022 This paper represented a control strategy for photovoltaic (PV) system, this control strategy was referred to as a low voltage ride through (LVRT), it had been achieved by using three phase (3-PH) (PV) grid-connected system, where this paper discussed the way to achieve maximum output active power from the solar system, while the solar system remained connected to the grid with voltage decreasing controller techniques and this was valid until certain amount of voltage decreasing which was clarified in the results. The main goal of low voltage ride through depended on injecting reactive power to the grid, amount of the injected reactive power depended on regulations of the grid code using the control of the inverter and the strategy depended on the grid voltage drop amount. MATLAB simulation had been used to achieve what was mentioned above, which led to present various cases of achieving maximum output active power with grid voltage drops by using conventional proportional integral (PI) control of the inverter. Finally, another control method, which was proportional integral genetic algorithm (PI-GA), had been used to improve value of the generated output active power. Keywords: Genetic algorithm Grid connected Low voltage ride through MATLAB simulation Solar energy generation This is an open access article under the CC BY-SA license. Corresponding Author: Mohammad Ahmad Shawqi Research and Planning Department, Ministry of Electricity and Renewable Energy Abbasia Square, Cairo, Egypt Email: wild_shakshak@yahoo.com 1. INTRODUCTION Recently, the lack of conventional fuels and pollution has become an important issue because it causes global climate change and a shortage of energy resources [1], [2]. Consequently, the global directed towards using green energy resources [3], such as wind, solar, geothermal and biomass [4], [5]. To achieve the needed requirement and decrease the problems attached with the lack of conventional fuels and the polluted atmosphere and many studies have been performed for renewable energy development [6], [7]. There is a big problem faces the regulatory entities which is the bad impact on the grid while connecting generation systems especially when the connected systems become large [8], [9]. Therefore, many countries regulate a code for the grid to qualify this negative impact. These regulations vary from country to country [10], [11]. Generally, these regulations clarify that photovoltaic (PV) systems must remain connected and operated for a specific time while cases of voltage drop in the grid [12], and supporting this grid with the required reactive current [13], [14]. The definition of this requirement, called low voltage ride through (LVRT), it is very important to avoid the blackouts of the grid [15], [16]. Depending on the voltage drop value, the requirements of LVRT are different regarding the duration of the fault and the quantity of the reactive power injected [17], [18]. These requirements to ensure the PV