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PLL-less one-cycle controlled modified load compensator for wide range of loads

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Title PLL-less one-cycle controlled modified load compensator for wide range of loads
 
Creator CHATTERJEE, K
CHANDRA, A
AL-HADDAD, K
 
Subject filters
 
Description Load compensators utilizing the principle of STATCOM are becoming more and more popular. Among the direct and indirect current control techniques, direct current control techniques are more popular as they offer better transient response and higher current control bandwidth. However, the aforementioned techniques require the service of a PLL to generate the current reference template. Presence of the PLL reduces the robustness of the controller. Although schemes based on instantaneous reactive power theory do not require the service of a PLL, they fail to perform if the utility voltages are distorted and/or unbalanced. As a result schemes based on one-cycle control are becoming more and more popular [9]-[10]. These schemes do not require the service of reference current template and hence the PLL which makes them robust so far as the presence of distortions in the utility voltages are concerned. However, these schemes give rise to instability problem in current control if the real component of the load current falls below a certain level or if the nature of the load is regenerative. In this paper a modified one-cycle controlled load compensator is proposed which significantly improves the stability margin of its operation so that it can negotiate loads having low real current component as well as regenerative loads. The compensator has been developed for both single phase as well as three phase applications. The viability of the scheme is ascertained through detailed simulation studies.
 
Publisher IEEE
 
Date 2011-10-25T01:22:48Z
2011-12-15T09:11:06Z
2011-10-25T01:22:48Z
2011-12-15T09:11:06Z
2005
 
Type Proceedings Paper
 
Identifier 2005 IEEE 36TH POWER ELECTRONIC SPECIALISTS CONFERENCE (PESC), VOLS 1-3,2322-2326
0-7803-9033-4
0275-9306
http://dx.doi.org/10.1109/PESC.2005.1581956
http://dspace.library.iitb.ac.in/xmlui/handle/10054/15567
http://hdl.handle.net/100/1850
 
Source 36th Annual IEEE Power Electronic Specialists Conference (PESC 05),Recife, BRAZIL,JUN 12-16, 2005
 
Language English