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Smart grid (SG) solutions that include distributed generators (DGs) are offered to address the shortcomings of the existing grid infrastructure. Recent decades have seen a decline in power quality (PQ) due to the injection of non-sinusoidal components into the grid, caused by the widespread use of power electronics devices and the expansion of non-linear loads. In a power grid, a major problem is caused by voltage fluctuations and system harmonics. Reactive power, PQ management, voltage sag, swell, flicker, harmonics, and negative sequence current are only some of the grid-connected problems that may be alleviated with the use of devices like the Active Low Pass Filter, STATCOM, SVC, capacitor bank, etc. As research methods advance, UPQC has become more effective in addressing almost every challenge that may arise. Maintaining PQ is the most crucial condition for improved process output in the sensitive load and manufacturing business, when failure to do so leads to manufacturing failures. The combination of a series converter and a shunt converter into a single UPQC makes it a switching device in the field of power electronics, and this may cause harmonics or distortion to be injected into the grid, destabilizing the system. Security and Power Quality (PQ) enhancement are two common concerns addressed by the Smart Grid (SG) technology. Because of the prevalence of power electronics and nonlinear loads, harmonics are introduced into the system. Popular Unified Power Quality Conditioners (UPQC) from the Flexible AC Transmission System (FACTS) are often used to address voltage sag, swell, flicker, power quality (PQ), and neutral current reduction in distribution networks. System stability for sensitive loads is impacted by the harmonics generated by a UPQC. In this work, we provide a new controller for the modified UPQC coupled with SG, along with strategies for eliminating harmonics. Harmonics of higher orders are suppressed by infusing harmonics of the same order, of comparable amplitude, but opposite phase from the other converter, while lower order harmonics are removed by careful consideration of switching angles. Modified UPQC converters use energy from a PV (Photo-Voltaic) panel as a source of excitation. Through the use of pre-stored firing angles in the microcontroller's memory, the series-shunt converter's firing angles may be determined instantly. [ABSTRACT FROM AUTHOR]