scholarly journals Anti-islanding Detection of Photovoltaic Inverter Based on Negative Sequence Voltage Injection to Grid

2012 ◽  
Vol 17 (6) ◽  
pp. 546-552
Author(s):  
Byeong-Heon Kim ◽  
Yong-Soon Park ◽  
Seung-Ki Sul ◽  
Woo-Chull Kim ◽  
Hyun-Young Lee
Keyword(s):  
Islanding Detection ◽  
Negative Sequence

scholarly journals A Robust Vector Current Controller with Negative-Sequence Current Capability for Grid-Connected Inverters

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4549
Author(s):  
Houshang Karimi ◽  
Aboutaleb Haddadi ◽  
Masoud Karimi-Ghartemani ◽  
Mahdieh Sadabadi
Keyword(s):  
Vector Current ◽  
State Feedback Control ◽  
Islanding Detection ◽  
Parameter Uncertainties ◽  
Negative Sequence ◽  
Double Frequency ◽  
Current Controller ◽  
Three Phase ◽  
Grid Connected Converters ◽  
Negative Sequence Current

This paper presents a vector current controller (in the synchronous reference, or the dq, frame) with negative-sequence current injection capability for three-phase grid-connected converters. This capability is desired for the operation of the converter during unbalanced conditions and also for a certain type of islanding detection. The proposed controller first determines the double-frequency current references and then uses a sixth-order two-input two-output proportional-integral-resonance (PIR) structure, which is optimally designed. Compared with the existing similar approaches, the proposed controller has a simpler structure and more robust performance, e.g., against system parameter uncertainties and weak grid conditions. The proposed controller is developed for converters with both the L-type and LCL-type filters. For the LCL-type converter, a suboptimal partial state feedback control is also proposed to achieve robust stability and active damping of resonance poles without requiring additional sensors. Detailed experimental results are presented to illustrate the properties and performances of the proposed controller.

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