Projekter pr. år
Abstrakt
Singleloop current control is an attractive scheme for the LCLtype gridconnected inverter due to its simplicity and low cost. However, conventional singleloop control schemes, which command either the inverter current or the grid current, are subject to the specific resonance frequency regions. The weighted average current control, which splits the filter capacitor into two parts (in form of an LCCL filter) and commands the current flowing between these two parts, is independent of the resonance frequency, but on the other hand, it is limited by the poor sensitivity to the grid impedance variation and weak stability in the grid current. These limitations are comprehensively explained in this paper and then addressed by identifying that the singleloop weighted average current control is equivalent to the dualloop grid current control with an inherent capacitor current active damping. By tuning the capacitor split proportion as a second degree of freedom, an optimal damping performance that is robust to the grid impedance variation can be naturally achieved using only the inherent damping. Thus, no extra damping is required, and the singleloop structure with only one current sensing turns to be adequate. Moreover, for convenience of practical implementation, an improved LCCL filter configuration is proposed to allow the use of two equal nominal capacitances for the split capacitors. Finally, experiments are performed to verify the effectiveness of the proposed method.
Originalsprog  Engelsk 

Tidsskrift  IEEE Transactions on Power Electronics 
Vol/bind  33 
Udgave nummer  10 
Sider (fratil)  84748487 
Antal sider  14 
ISSN  08858993 
DOI  
Status  Udgivet  okt. 2018 
Fingeraftryk
Dyk ned i forskningsemnerne om 'A Highly Robust SingleLoop Current Control Scheme for GridConnected Inverter with an Improved LCCL Filter Configuration'. Sammen danner de et unikt fingeraftryk.Projekter
 1 Afsluttet

HARMONY: HARMONY  Harmonic identification, mitigation and control in power electronics based power systems
Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.
01/02/2013 → 28/02/2018
Projekter: Projekt › Forskning