11-09-2017, 01:23 PM
The Hybrid Series active filter (HSAF) design is presented for harmonic reduction and reactive power compensation in single phase systems. The HSAF consists of the combination in series of two tuned LC filters that are tuned to 3rd and 5th harmonics and with an active filter. The discrete Fourier transform is used as a control technique. The results of the simulation using MATLAB show the effectiveness of the control technique. When obtaining the results of the simulation the value of THD is very low (2.75%), which is very insignificant. Therefore, the quality of energy is said to have improved.
Unintentional series and / or parallel resonances, due to the tuned passive filter and the line inductance, can produce a severe harmonic distortion in the industrial power system. This paper presents an active hybrid filter to suppress harmonic resonance and reduce harmonic distortion. The proposed hybrid filter is operated as variable harmonic conductance according to the total harmonic distortion of voltage; therefore, the harmonic distortion can be reduced to an acceptable level in response to the change in load or variation of power system parameters. Since the hybrid filter is composed of a seventh-pass passive filter and a serial active filter, both the DC voltage and the kVA value of the active filter decrease dramatically compared to the pure by-pass active filter. In real applications, this feature is very attractive since the active power filter with power electronics is very expensive. A reasonable balance between filtering yields and cost is to use the hybrid active filter. Design considerations are presented and experimental results are provided to validate the efficacy of the proposed method. In addition, this paper analyzes the results of filtering on line impedance, line resistance, voltage unbalance and capacitive filters.
Unintentional series and / or parallel resonances, due to the tuned passive filter and the line inductance, can produce a severe harmonic distortion in the industrial power system. This paper presents an active hybrid filter to suppress harmonic resonance and reduce harmonic distortion. The proposed hybrid filter is operated as variable harmonic conductance according to the total harmonic distortion of voltage; therefore, the harmonic distortion can be reduced to an acceptable level in response to the change in load or variation of power system parameters. Since the hybrid filter is composed of a seventh-pass passive filter and a serial active filter, both the DC voltage and the kVA value of the active filter decrease dramatically compared to the pure by-pass active filter. In real applications, this feature is very attractive since the active power filter with power electronics is very expensive. A reasonable balance between filtering yields and cost is to use the hybrid active filter. Design considerations are presented and experimental results are provided to validate the efficacy of the proposed method. In addition, this paper analyzes the results of filtering on line impedance, line resistance, voltage unbalance and capacitive filters.