Panpean, C., Prakobkaew, P., Sumpavakup, C., Songtrai, S., Watjanatepin, N., Chaiyaphun, K. and homjan, jeerawan 2026. Improving the PQ Harmonic Detection Method for Active Power Filters in Single-Phase Power Systems. ECTI Transactions on Electrical Engineering, Electronics, and Communications. 24, 1 (Feb. 2026). DOI:https://doi.org/10.37936/ecti-eec.2026241.261151.