Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/131132
Title: An Active Trap Filter for Switching Harmonic Attenuation of Low-Pulse-Ratio Inverters
Authors: Haofeng Bai;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: Switching harmonic attenuation has always been challenging for inverters used in high-power conversion applications, where ratio of switching to fundamental frequency is low. Addition of multiple <italic>LC</italic>-trap filters is no doubt a feasible cost-effective method, which has increasingly been used, but generally susceptible to filter parameter variations and harmonic resonances. This paper hence presents an alternative active trap filter (ATF), based on a series-<italic>LC</italic>-filtered inverter, for attenuating switching harmonics in a flexible, while yet not cost burdensome, approach. A direct impedance synthesis method has also been proposed for the ATF to better enforce its active switching harmonic bypassing ability. Compared with conventional schemes for controlling active power filters, the proposed method is more readily implemented, since it requires neither current reference generation nor high-bandwidth current control loop. Moreover, the use of a series <italic>LC</italic> filter at its ac side helps the ATF to reduce its inverter voltage and power ratings. Compensated frequency range of the ATF can hence be enlarged by using a comparably higher switching frequency and a proper step-by-step design procedure to be presented in this paper. Simulation and experimental results have confirmed the design procedures, and hence expected performance of the ATF.
URI: http://localhost/handle/Hannan/131132
volume: 32
issue: 12
More Information: 9078,
9092
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7831437.pdf3.23 MBAdobe PDF
Title: An Active Trap Filter for Switching Harmonic Attenuation of Low-Pulse-Ratio Inverters
Authors: Haofeng Bai;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: Switching harmonic attenuation has always been challenging for inverters used in high-power conversion applications, where ratio of switching to fundamental frequency is low. Addition of multiple <italic>LC</italic>-trap filters is no doubt a feasible cost-effective method, which has increasingly been used, but generally susceptible to filter parameter variations and harmonic resonances. This paper hence presents an alternative active trap filter (ATF), based on a series-<italic>LC</italic>-filtered inverter, for attenuating switching harmonics in a flexible, while yet not cost burdensome, approach. A direct impedance synthesis method has also been proposed for the ATF to better enforce its active switching harmonic bypassing ability. Compared with conventional schemes for controlling active power filters, the proposed method is more readily implemented, since it requires neither current reference generation nor high-bandwidth current control loop. Moreover, the use of a series <italic>LC</italic> filter at its ac side helps the ATF to reduce its inverter voltage and power ratings. Compensated frequency range of the ATF can hence be enlarged by using a comparably higher switching frequency and a proper step-by-step design procedure to be presented in this paper. Simulation and experimental results have confirmed the design procedures, and hence expected performance of the ATF.
URI: http://localhost/handle/Hannan/131132
volume: 32
issue: 12
More Information: 9078,
9092
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7831437.pdf3.23 MBAdobe PDF
Title: An Active Trap Filter for Switching Harmonic Attenuation of Low-Pulse-Ratio Inverters
Authors: Haofeng Bai;Xiongfei Wang;Poh Chiang Loh;Frede Blaabjerg
Year: 2017
Publisher: IEEE
Abstract: Switching harmonic attenuation has always been challenging for inverters used in high-power conversion applications, where ratio of switching to fundamental frequency is low. Addition of multiple <italic>LC</italic>-trap filters is no doubt a feasible cost-effective method, which has increasingly been used, but generally susceptible to filter parameter variations and harmonic resonances. This paper hence presents an alternative active trap filter (ATF), based on a series-<italic>LC</italic>-filtered inverter, for attenuating switching harmonics in a flexible, while yet not cost burdensome, approach. A direct impedance synthesis method has also been proposed for the ATF to better enforce its active switching harmonic bypassing ability. Compared with conventional schemes for controlling active power filters, the proposed method is more readily implemented, since it requires neither current reference generation nor high-bandwidth current control loop. Moreover, the use of a series <italic>LC</italic> filter at its ac side helps the ATF to reduce its inverter voltage and power ratings. Compensated frequency range of the ATF can hence be enlarged by using a comparably higher switching frequency and a proper step-by-step design procedure to be presented in this paper. Simulation and experimental results have confirmed the design procedures, and hence expected performance of the ATF.
URI: http://localhost/handle/Hannan/131132
volume: 32
issue: 12
More Information: 9078,
9092
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7831437.pdf3.23 MBAdobe PDF