Abstract: - The recent innovation in power electronic application in the electrical power system (EPS) has given birth to an Improved Unified Power Quality Conditioner (IUPQC) that positively impacts the electrical power system (EPS). The previously available mitigation approaches with the application IUPQC are monotonous and are major designs for a particular power quality (PQ) issue which does not take care of the degree of impart. This paper presents an effective control architecture of an IUPQC design for sensitive loads in hybrid Photovoltaic Solar (PV) connected grid, concentrating on the voltage demand of loads that respond to slight changes. The objective of this work is to design a flexible controller that can respond to the different degrees of PQ challenges concerning voltage, variable load, and solar irradiation. It has combined the merits of an IUPQC and grid-integrated PV source. Effective controllers for Voltage Source Inverter (VSI) connected in series and Current Source Inverter (CSI) connected in shunt compensators of the UPQC are implemented to increase device strength for different voltage and current distortions. The series compensator was controlled using an enhanced Synchronous Reference Frame (SRF) technique based on adaptive notch filters. An Adaptive Logarithmic Absolute Algorithm (ALAL) was deployed for the parallel section of the proposed approach. The Mean Turning Filter (MTF) was used as a replacement for a low pass filter (LPF) for direct current node voltage management, leaving high and low-frequency ripples unaffected. To maintain a constant current on the grid side during grid disturbances, a feed-forward element has been introduced to the shunt CSI controller. Under various network situations, such as under-voltage, over-voltage, voltage distortion, harmonics, rapid load changes, and fluctuation in solar power, the control system performance is better as confirmed by experimental validation. Finally, it is observed that the voltage profile of 0.984 p.u. due to application control falling within the permissible limits. The proposed controllers are tested in the MATLAB Simulink on a developed distribution system model and validated experimental prototype. Keywords: - Solar Photovoltaic, Under-voltage, Voltage Sensitive Load (VSL), Over-voltage, Unbalance voltage, improved unified power quality conditioner. Received: June 28, 2022. Revised: January 9, 2023. Accepted: February 15, 2023. Published: March 17, 2023. 1 Introduction The advancement in power electronics results in various nonlinear loads at the load center, making the distribution system increasingly prone to many power quality issues, [1], [2]. A lot of power conditioners have been proposed to achieve the electricity value requirements in the distribution network. Traditional UPQCs have proven their ability to tackle a variety of PQ challenges among all types and capacities of power quality conditioners, [3], [4], [5]. Researchers have proposed diverse power conditioners and UPQC in response to various power system concerns. The presence of diverse types of loads and voltage fluctuation at the receiving end resulted in PQ challenges, and there is a need for a mitigation device in the distribution grid. Because current harmonics cannot be reduced, the work, [6] proposed a voltage amelioration approach for critical loads to protect them from voltage fluctuation. A repeatable controller with a recursively least square technique was used in the series compensator. The effective voltage restorer used for loads with voltage sensitivity, [7], and [8] suggested a controller centered on an improved phase-locked loop (PLL). Quite enough research has been carried out on electric grid disruption prevention strategies to WSEAS TRANSACTIONS on POWER SYSTEMS DOI: 10.37394/232016.2023.18.4 Oluwafunso Oluwole Osaloni, Ayodeji Stephen Akinyemi, Abayomi Aduragba Adebiyi, Ayodeji Olalekan Salau E-ISSN: 2224-350X 26 Volume 18, 2023 An Effective Control Technique to Implement an IUPQC Design for Sensitive Loads in a Hybrid Solar PV-Grid Connection OLUWAFUNSO OLUWOLE OSALONI 1 , AYODEJI STEPHEN AKINYEMI 2 , ABAYOMI ADURAGBA ADEBIYI 2 , AYODEJI OLALEKAN SALAU 1,3 1 Department Electrical Electronic and Computer Engineering, Afe Babalola University Ado Ekiti, Ekiti-State, NIGERIA 2 Department Electrical Power Engineering, Durban University of Technology, Durban, SOUTH AFRICA 3 Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, INDIA