The Harmonic Mitigation in the Smelting Industry Connected to Active Distribution Network in Phetchaburi Province Using Single-Tuned Passive Harmonic Filters Considering Load Demand

Abstract

A large number of nonlinear loads have been implemented in modern power systems, such as electric vehicles, electronic ballasts, and equipment inverter circuits. Moreover, most industrial devices have adopted inverters, including mining, metal smelting, and textile industries. The mentioned nonlinear loads cause harmonics in the power system, resulting in greater power loss, fail protection, and a shorter lifespan. Therefore, this paper presents the harmonic mitigation in the smelting industry connected to the active distribution network in Phetchaburi province using single-tuned passive harmonic filters considering load demand. To determine the suitable single-tuned harmonic filters for reducing harmonics in various load ranges by using the data of the smelting industry, the actual load profile is measured and analyzed as the average value for the proposed method. The simulation results are carried out using DIgSILENT PowerFactory software to verify the proposed method performances, consisting of three scenarios, which are light, normal, and peak loads. The results show that the single-tuned passive harmonic filters using the proposed average load demand-based passive filter method can reduce the harmonic currents of 7th, 9th, and 11th for various load conditions and also improve the harmonic distortion of the power system and the total harmonic distortion of current, satisfying the PEA grid code requirement.