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A Hybrid Active Filter
#1

A Hybrid Active Filter


.doc   A Hybrid Active Filter.doc (Size: 159.5 KB / Downloads: 31)

EXISTING SYSTEM:

Standard AC supply is converted to a DC voltage by using a 3-phase diode bridge rectifier. A capacitor filters the ripple in the DC bus. This DC bus is used to generate a variable voltage and variable frequency power supply. A voltage source power inverter is used to convert the DC bus to the required AC voltage and frequency. In summary, the power section consists of a power rectifier, filter capacitor, and power inverter.

The main 3-phase supply is rectified by using the 3-phase diode bridge rectifier. The DC ripple is filtered by using an electrolytic capacitor. This DC bus is connected to the IGBTs for inverting.

DRAW BACKS:

The diode rectifier produces a large amount of harmonic current at the line side, and therefore, it does not comply with harmonic guidelines or regulations.

ADVANTAGES:

A hybrid active filter for mitigating the line-side harmonic currents is proposed. For a three-phase 12-pulse diode rectifier. This hybrid filter consists of series connection of a simple LC filter tuned to the 11th-harmonic frequency with a small-rated active filter using a three-level neutral-point clamped NPC PWM converter. The hybrid active filter has the following advantages over a pure active filter and a traditional passive filter consisting of multiple-tuned LC filters and a high pass filter: the active filter taking part in the hybrid filter is much smaller in converter capacity than the pure active filter. The simple single-tuned LC filter used in the hybrid filter is much smaller in size, lower in cost and weight, than the traditional passive filter.


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#2
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.
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Marked Categories : hybrid filters using power quality, seminar reporton hybrid filter, hybrid filter, hybrid active filters presentations, active filter,

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