TY - GEN
T1 - Reduced-order Aggregate Model for Parallel-connected Grid-tied Three-phase Photovoltaic Inverters
AU - Purba, Victor
AU - Johnson, Brian B.
AU - Dhople, Sairaj V.
PY - 2019/6
Y1 - 2019/6
N2 - Ratings of utility-scale grid-tied photovoltaic (PV) inverters are typically no more than 1 MVA. This implies that a large number of inverters are usually installed in utility-scale PV energy-conversion systems. Given the complexity of inverter dynamic models (typical models are high dimension and nonlinear), reduced-order models for inverters are critical for performance assessment and accurate representation of PV-system dynamics in the bulk power grid with limited computational burden. In this paper, we formulate a reduced-order model for parallel- connected grid-tied three-phase PV inverters that has the same structure and model order as a single inverter. We adopt a singlediode model for the PV modules, and each inverter is assumed to be a single-stage dc-ac voltage-source converter with an input dc- link capacitor and an LCL output filter. The control architecture includes a maximum power point tracking (MPPT) algorithm, a dc-link voltage controller, a reactive power controller, a current controller, and a phase-locked loop for grid synchronization. Numerical simulations demonstrate the computational benefits and accuracy of the reduced-order model.
AB - Ratings of utility-scale grid-tied photovoltaic (PV) inverters are typically no more than 1 MVA. This implies that a large number of inverters are usually installed in utility-scale PV energy-conversion systems. Given the complexity of inverter dynamic models (typical models are high dimension and nonlinear), reduced-order models for inverters are critical for performance assessment and accurate representation of PV-system dynamics in the bulk power grid with limited computational burden. In this paper, we formulate a reduced-order model for parallel- connected grid-tied three-phase PV inverters that has the same structure and model order as a single inverter. We adopt a singlediode model for the PV modules, and each inverter is assumed to be a single-stage dc-ac voltage-source converter with an input dc- link capacitor and an LCL output filter. The control architecture includes a maximum power point tracking (MPPT) algorithm, a dc-link voltage controller, a reactive power controller, a current controller, and a phase-locked loop for grid synchronization. Numerical simulations demonstrate the computational benefits and accuracy of the reduced-order model.
KW - Maximum power point tracking
KW - model reduction
KW - photovoltaic inverter
KW - three-phase inverter
UR - http://www.scopus.com/inward/record.url?scp=85081640012&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85081640012&partnerID=8YFLogxK
U2 - 10.1109/PVSC40753.2019.8980475
DO - 10.1109/PVSC40753.2019.8980475
M3 - Conference contribution
AN - SCOPUS:85081640012
T3 - Conference Record of the IEEE Photovoltaic Specialists Conference
SP - 724
EP - 729
BT - 2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Y2 - 16 June 2019 through 21 June 2019
ER -
