TY - JOUR
T1 - Assessment and performance evaluation of DC-side interactions of voltage-source inverters interfacing renewable energy systems
AU - Radwan, Amr Ahmed A.
AU - Mohamed, Yasser Abdel Rady I.
AU - El-Saadany, Ehab F.
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2015/3/1
Y1 - 2015/3/1
N2 - This paper presents a performance characterization and efficient modeling of the dc-side interactions between renewable dc resources and interfacing voltage-source inverters (VSIs). The VSI is considered in both grid-connected and islanded modes of operation. On the other side, the dc source is modeled by an equivalent and a detailed circuit. In the former, an ideal current-source in parallel to a dc capacitor is used to represent a non-dispatchable source whereas an ideal dc voltage source is used to represent a dispatchable dc source. In the latter, an additional dc/dc boost converter interfaces the dc source to regulate the input dc-link voltage of the VSI. In all topologies, computationally-efficient small-signal admittance-based models, i.e.transfer-functions, are thoroughly developed for the dc source as well as the VSI. Using the Nyquist stability criterion, it is shown that the dc-link voltage dynamics is negatively affected under some operating conditions. The worst performance is yielded when the dc source is modeled by an ideal voltage source where the dc-link voltage is not controlled by the VSI. On the contrary, the dc/dc boost converter enhances the system damping. The dc-link voltage-controlling VSIs show the most damped performance. In order to enhance the system damping, active stabilizing compensators are proposed and embedded in the conventional control structure of VSIs. Large-signal time-domain simulation model is implemented under Matlab/Simulink environment to validate the small-signal models and show the effectiveness of the proposed compensators.
AB - This paper presents a performance characterization and efficient modeling of the dc-side interactions between renewable dc resources and interfacing voltage-source inverters (VSIs). The VSI is considered in both grid-connected and islanded modes of operation. On the other side, the dc source is modeled by an equivalent and a detailed circuit. In the former, an ideal current-source in parallel to a dc capacitor is used to represent a non-dispatchable source whereas an ideal dc voltage source is used to represent a dispatchable dc source. In the latter, an additional dc/dc boost converter interfaces the dc source to regulate the input dc-link voltage of the VSI. In all topologies, computationally-efficient small-signal admittance-based models, i.e.transfer-functions, are thoroughly developed for the dc source as well as the VSI. Using the Nyquist stability criterion, it is shown that the dc-link voltage dynamics is negatively affected under some operating conditions. The worst performance is yielded when the dc source is modeled by an ideal voltage source where the dc-link voltage is not controlled by the VSI. On the contrary, the dc/dc boost converter enhances the system damping. The dc-link voltage-controlling VSIs show the most damped performance. In order to enhance the system damping, active stabilizing compensators are proposed and embedded in the conventional control structure of VSIs. Large-signal time-domain simulation model is implemented under Matlab/Simulink environment to validate the small-signal models and show the effectiveness of the proposed compensators.
KW - Distributed generation
KW - Negative resistance
KW - Nyquist stability criterion
KW - Small-signal analysis
KW - Voltage-source converter
UR - http://www.scopus.com/inward/record.url?scp=84922569813&partnerID=8YFLogxK
U2 - 10.1016/j.segan.2014.11.002
DO - 10.1016/j.segan.2014.11.002
M3 - Article
AN - SCOPUS:84922569813
SN - 2352-4677
VL - 1
SP - 28
EP - 44
JO - Sustainable Energy, Grids and Networks
JF - Sustainable Energy, Grids and Networks
ER -
