Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/190021
Title: Second Ripple Current Suppression by Two Bandpass Filters and Current Sharing Method for Energy Storage Converters in DC Microgrid
Authors: Ling Yang;Yandong Chen;An Luo;Wenhua Wu;Kunshan Huai;Xiaoping Zhou;Leming Zhou;Qianming Xu;Josep M. Guerrero
Year: 2017
Publisher: IEEE
Abstract: With the increase in ac loads injected into the dc microgrid (MG) through inverters, the second ripple current (SRC) in the front-end energy storage converter (ESC) and the circulating current among the ESCs in dc MG become more and more serious. In this paper, the SRC suppression method by introducing two bandpass filters (BPFs) into the output voltage and inductance current feedback of the ESC is proposed. Compared with the traditional dual-loop control method, the proposed method effectively reduces the SRC and improves the dynamic performance in case of a lower cutoff frequency in the outer voltage loop. Simultaneously, an adaptive droop control method by introducing the fine-tuning virtual resistances is adopted to reduce the output voltage deviation of parallel ESCs and improve the output current sharing among the ESCs. Considering the allowed range of deviation between the output voltage and the rated voltage for each ESC, the impacts of the line power loss and circulating current power loss caused by the introduced virtual resistances are analyzed in detail. While the sum of the line power loss and circulating current power loss reaches the minimum value, the appropriate control parameters are obtained. Simulation and experimental results verify the validity of the proposed method.
URI: http://localhost/handle/Hannan/190021
volume: 5
issue: 3
More Information: 1031,
1044
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7792149.pdf4.56 MBAdobe PDF
Title: Second Ripple Current Suppression by Two Bandpass Filters and Current Sharing Method for Energy Storage Converters in DC Microgrid
Authors: Ling Yang;Yandong Chen;An Luo;Wenhua Wu;Kunshan Huai;Xiaoping Zhou;Leming Zhou;Qianming Xu;Josep M. Guerrero
Year: 2017
Publisher: IEEE
Abstract: With the increase in ac loads injected into the dc microgrid (MG) through inverters, the second ripple current (SRC) in the front-end energy storage converter (ESC) and the circulating current among the ESCs in dc MG become more and more serious. In this paper, the SRC suppression method by introducing two bandpass filters (BPFs) into the output voltage and inductance current feedback of the ESC is proposed. Compared with the traditional dual-loop control method, the proposed method effectively reduces the SRC and improves the dynamic performance in case of a lower cutoff frequency in the outer voltage loop. Simultaneously, an adaptive droop control method by introducing the fine-tuning virtual resistances is adopted to reduce the output voltage deviation of parallel ESCs and improve the output current sharing among the ESCs. Considering the allowed range of deviation between the output voltage and the rated voltage for each ESC, the impacts of the line power loss and circulating current power loss caused by the introduced virtual resistances are analyzed in detail. While the sum of the line power loss and circulating current power loss reaches the minimum value, the appropriate control parameters are obtained. Simulation and experimental results verify the validity of the proposed method.
URI: http://localhost/handle/Hannan/190021
volume: 5
issue: 3
More Information: 1031,
1044
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7792149.pdf4.56 MBAdobe PDF
Title: Second Ripple Current Suppression by Two Bandpass Filters and Current Sharing Method for Energy Storage Converters in DC Microgrid
Authors: Ling Yang;Yandong Chen;An Luo;Wenhua Wu;Kunshan Huai;Xiaoping Zhou;Leming Zhou;Qianming Xu;Josep M. Guerrero
Year: 2017
Publisher: IEEE
Abstract: With the increase in ac loads injected into the dc microgrid (MG) through inverters, the second ripple current (SRC) in the front-end energy storage converter (ESC) and the circulating current among the ESCs in dc MG become more and more serious. In this paper, the SRC suppression method by introducing two bandpass filters (BPFs) into the output voltage and inductance current feedback of the ESC is proposed. Compared with the traditional dual-loop control method, the proposed method effectively reduces the SRC and improves the dynamic performance in case of a lower cutoff frequency in the outer voltage loop. Simultaneously, an adaptive droop control method by introducing the fine-tuning virtual resistances is adopted to reduce the output voltage deviation of parallel ESCs and improve the output current sharing among the ESCs. Considering the allowed range of deviation between the output voltage and the rated voltage for each ESC, the impacts of the line power loss and circulating current power loss caused by the introduced virtual resistances are analyzed in detail. While the sum of the line power loss and circulating current power loss reaches the minimum value, the appropriate control parameters are obtained. Simulation and experimental results verify the validity of the proposed method.
URI: http://localhost/handle/Hannan/190021
volume: 5
issue: 3
More Information: 1031,
1044
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7792149.pdf4.56 MBAdobe PDF