**8. Conclusions**

An equal reactive power sharing strategy for a single-phase UPC system was proposed in this work as a more efficient and practical way of adapting identical APFs with the same rating. The SRF-based controller employed in this system for the shunt APF controller also proved to be helpful under non-sinusoidal conditions of supply voltage for a PA estimation to implement equal reactive power sharing. In this paper, a detailed performance analysis was presented for a UPC system under different supply voltages (i.e., voltage sag, swell and harmonics) and loading conditions (i.e., a non-linear load, linear load and composite load). The performance indices considered for this analysis were current harmonic compensation, load voltage compensation and reactive power compensation with equal sharing criteria between the shunt and series APF. It was clearly observed from the result analysis and tabular data compilation that the UPC system offered a significant compensation performance under different conditions of voltage and load. A comparative analysis was presented between the PQ method and the SRF method for current harmonic compensation, a PA estimation and equal reactive power sharing under a non-sinusoidal supply voltage. As deduced from this comparative analysis in terms of the results and comparative data tabulation, the SRF method proved to be superior than the PQ method under non-sinusoidal supply conditions. Thus, the SRF method is not only suitable for shunt APF control implementation, but also offers better reactive power sharing support under non-sinusoidal supply conditions between a shunt and series APF, utilizing only SRF parameters.

**Author Contributions:** Conceptualization, N.P., R.P. and B.S.; Data curation, N.P., R.P. and B.S.; Formal analysis, R.S. and A.E.-S.; Funding acquisition, N.P. and A.E.-S.; Investigation, R.P., R.S. and A.Y.A.; Methodology, N.P., R.P., R.S. and B.S.; Project administration, A.Y.A. and A.E.-S.; Resources, B.S., A.Y.A. and A.E.-S.; Software, N.P., R.S. and B.S.; Supervision, A.Y.A. and A.E.-S.; Validation, A.Y.A.; Writing—original draft, N.P. and R.S.; Writing—review & editing, A.E.-S. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
