In power distribution systems the power quality (PQ), is a major challenge. Power quality issues include current harmonics, poor power factor, voltage harmonics, and voltage sag and swell below what customers want, especially for sensitive loads, are caused by imbalanced non-linear loads. A possible solution for dealing with PQ issues is the Unified Power Quality Conditioner (UPQC), which mixes shunt and series compensators. It's the unit vector template generation (UVTG) strategy in a series active power filter (APF) to mitigate the voltage quality issues, the series APF injects a compensating voltage between the grid and the consumer load in order to restore the load voltage to its reference value and reduction (Total Harmonic Distortion) THD to 2.9% in the load voltage while the THD in grid voltage equal 25.85%. Comparison was made between three current control strategies in shunt APF to mitigate the current quality issues for cases of imbalance harmonic distortion in load current. The THD in the load current equal 17.06% became 5.25% in the grid current by using unit vector template generation (UVTG) strategy while using instantaneous reactive power strategy (P-Q) strategy is 22.29%. When there is a grid voltage distortion, sag-harmoincs injected in grid voltage, this is regarded as the most severe case The research results showed that the (UVTG) strategy is the most effective strategy to decrease the THD in grid current. All strategies were able to balance between the phase currents in the grid current. To improve the regulation of the DC link voltage in shunt APF for every strategy, the PI control parameter was adjusted using the Snake optimization algorithm. From the research results, we note the success of this technique in treating cases of power quality issues, is less than 5% according to the IEEE-519 standard.