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Development of Shunt-Type Three-Phase Active Power Filter with Novel Adaptive Control for Wind Generators.

Chen MH - ScientificWorldJournal (2015)

Bottom Line: The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states.Subsequently, a digital signal processor was used to implement an active power filter.Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Ming Chi University of Technology, 84 Gungjuan Road, Taishan District, New Taipei City 24301, Taiwan.

ABSTRACT
This paper proposes a new adaptive filter for wind generators that combines instantaneous reactive power compensation technology and current prediction controller, and therefore this system is characterized by low harmonic distortion, high power factor, and small DC-link voltage variations during load disturbances. The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states. Subsequently, a digital signal processor was used to implement an active power filter. The experimental results indicate, that for the rated operation of 2 kVA, the system has a total harmonic distortion of current less than 5.0% and a power factor of 1.0 on the utility side. Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.

No MeSH data available.


Related in: MedlinePlus

Equivalent circuit of active power filter.
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fig2: Equivalent circuit of active power filter.

Mentions: Consider Figure 1, where the dashed box represents the circuit diagram of the APF. If the reactors of the wind generator are neglected, the equivalent circuit of the APF can be obtained as shown in Figure 2. The switch status dx can be written as(1)dx=1if  Tx+:  on,  Tx−:  off0if  Tx+:  off,  Tx−:  on,where Tx+ and Tx− represent power transistors and x denotes a, b, or c. The switch voltages vaf, vbf, and vcf and the DC-link voltage vdc can be expressed as [7](2)vafvbfvcf=vdc32−1−1−12−1−1−12dadbdc.The differential equations for Figure 2 are as follows:(3)Lfddtiaf=vaG−rfiaf−vaf,Lfddtibf=vbG−rfibf−vbf,Lfddticf=vcG−rficf−vcf,Cdcddtvdc=daiaf+dbibf+dcicf, where vaG, vbG, and vcG represent the phase voltages of the wind generator and vaf, vbf, and vcf represent the input voltages of the three-phase full-bridge power converter; rf and Lf are the resistance and inductance of the APF line reactors, respectively, and Cdc is the capacitance of the DC-link capacitor.


Development of Shunt-Type Three-Phase Active Power Filter with Novel Adaptive Control for Wind Generators.

Chen MH - ScientificWorldJournal (2015)

Equivalent circuit of active power filter.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4587435&req=5

fig2: Equivalent circuit of active power filter.
Mentions: Consider Figure 1, where the dashed box represents the circuit diagram of the APF. If the reactors of the wind generator are neglected, the equivalent circuit of the APF can be obtained as shown in Figure 2. The switch status dx can be written as(1)dx=1if  Tx+:  on,  Tx−:  off0if  Tx+:  off,  Tx−:  on,where Tx+ and Tx− represent power transistors and x denotes a, b, or c. The switch voltages vaf, vbf, and vcf and the DC-link voltage vdc can be expressed as [7](2)vafvbfvcf=vdc32−1−1−12−1−1−12dadbdc.The differential equations for Figure 2 are as follows:(3)Lfddtiaf=vaG−rfiaf−vaf,Lfddtibf=vbG−rfibf−vbf,Lfddticf=vcG−rficf−vcf,Cdcddtvdc=daiaf+dbibf+dcicf, where vaG, vbG, and vcG represent the phase voltages of the wind generator and vaf, vbf, and vcf represent the input voltages of the three-phase full-bridge power converter; rf and Lf are the resistance and inductance of the APF line reactors, respectively, and Cdc is the capacitance of the DC-link capacitor.

Bottom Line: The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states.Subsequently, a digital signal processor was used to implement an active power filter.Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Ming Chi University of Technology, 84 Gungjuan Road, Taishan District, New Taipei City 24301, Taiwan.

ABSTRACT
This paper proposes a new adaptive filter for wind generators that combines instantaneous reactive power compensation technology and current prediction controller, and therefore this system is characterized by low harmonic distortion, high power factor, and small DC-link voltage variations during load disturbances. The performance of the system was first simulated using MATLAB/Simulink, and the possibility of an adaptive digital low-pass filter eliminating current harmonics was confirmed in steady and transient states. Subsequently, a digital signal processor was used to implement an active power filter. The experimental results indicate, that for the rated operation of 2 kVA, the system has a total harmonic distortion of current less than 5.0% and a power factor of 1.0 on the utility side. Thus, the transient performance of the adaptive filter is superior to the traditional digital low-pass filter and is more economical because of its short computation time compared with other types of adaptive filters.

No MeSH data available.


Related in: MedlinePlus