TY - JOUR
T1 - A Control Strategy for Dual-Input Neutral-Point-Clamped Inverter-Based Grid-Connected Photovoltaic System
AU - Beniwal, Neha
AU - Tafti, Hossein Dehghani
AU - Farivar, Glen Ghias
AU - Ceballos, Salvador
AU - Pou, Josep
AU - Blaabjerg, Frede
N1 - Publisher Copyright:
© 1986-2012 IEEE.
PY - 2021/9
Y1 - 2021/9
N2 - This article presents a control strategy for a dual-input neutral-point-clamped (NPC) inverter-based grid-connected photovoltaic (PV) system to asymmetrically control the PV arrays without incorporating any additional external circuit. This is achieved by employing an analytically developed linearization block, which helps in generating the required neutral point (NP) current to counter for the difference in the PV currents. The analysis also provides the maximum NP current compensation limits of the NPC inverter. If the required NP current reference is less than the maximum limit, both PV arrays operate at their maximum power points. However, if the required current exceeds the limit, one of the PV arrays operates at its maximum power point, while the output power of the other PV array is reduced to satisfy the NP current limit. Experimental tests are conducted on a laboratory prototype to validate the performance of the proposed control strategy.
AB - This article presents a control strategy for a dual-input neutral-point-clamped (NPC) inverter-based grid-connected photovoltaic (PV) system to asymmetrically control the PV arrays without incorporating any additional external circuit. This is achieved by employing an analytically developed linearization block, which helps in generating the required neutral point (NP) current to counter for the difference in the PV currents. The analysis also provides the maximum NP current compensation limits of the NPC inverter. If the required NP current reference is less than the maximum limit, both PV arrays operate at their maximum power points. However, if the required current exceeds the limit, one of the PV arrays operates at its maximum power point, while the output power of the other PV array is reduced to satisfy the NP current limit. Experimental tests are conducted on a laboratory prototype to validate the performance of the proposed control strategy.
KW - Carrier-based pulsewidth modulation (CBPWM)
KW - feedforward compensation
KW - neutral point (NP) current
KW - neutral-point-clamped (NPC) converter
KW - partial shading
KW - photovoltaic (PV) arrays
UR - http://www.scopus.com/inward/record.url?scp=85102243974&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2021.3063745
DO - 10.1109/TPEL.2021.3063745
M3 - Article
AN - SCOPUS:85102243974
SN - 0885-8993
VL - 36
SP - 9743
EP - 9757
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 9
M1 - 9369863
ER -
