DocumentCode :
73755
Title :
Analysis of significant current tracking error and suppression of over-shoot current in grid-connected voltage source converter with abc frame control
Author :
Guopeng Zhao ; Minxiao Han
Author_Institution :
Sch. of Electr. & Electron. Eng., North China Electr. Power Univ., Beijing, China
Volume :
7
Issue :
9
fYear :
2014
fDate :
Sep-14
Firstpage :
2347
Lastpage :
2353
Abstract :
This study proposes an analysis and specification of current loop tracking error in the grid-connected voltage source converter with direct current control. In practical applications, it is a common phenomenon that the current control loop sees a quite significant command-tracking error while the actual output current of the converter is still satisfactory, for example, for static var generators or parallel active power filters, it is exactly the reactive current and/or the harmonic current that are needed to compensate the load current. In this study, a detailed analysis is presented to investigate this confusing issue. Based on the obtained current loop transfer function, analytical expressions of the current tracking error are derived. The reasons why a significant current tracking error exists together with satisfactory compensation result are revealed subsequently. The current tracking error has a relationship with the source voltage. An over-shoot start current appears because of the current tracking error. Two new methods used to suppress the over-shoot current are also presented. Finally, the hardware experimental results verify the analysis and the methods of suppressing the over-shoot current.
Keywords :
electric current control; power convertors; power grids; transfer functions; abc frame control; command-tracking error; converter current; current control loop; current loop tracking error; current loop transfer function; direct current control; grid-connected voltage source converter; harmonic current; load current compensation; over-shoot current suppression; over-shoot start current; parallel active power filters; reactive current; static var generators;
fLanguage :
English
Journal_Title :
Power Electronics, IET
Publisher :
iet
ISSN :
1755-4535
Type :
jour
DOI :
10.1049/iet-pel.2013.0645
Filename :
6900858
Link To Document :
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