TY - JOUR
T1 - A General Constant Power Generation Algorithm for Photovoltaic Systems
AU - Tafti, Hossein Dehghani
AU - Maswood, Ali Iftekhar
AU - Konstantinou, Georgios
AU - Pou, Josep
AU - Blaabjerg, Frede
PY - 2018/5
Y1 - 2018/5
N2 - Photovoltaic power plants (PVPPs) typically operate by tracking the maximum power point (MPP) in order to maximize the conversion efficiency. However, with the continuous increase of installed grid-connected PVPPs, power system operators have been experiencing new challenges, such as overloading, overvoltages, and operation during grid-voltage disturbances. Consequently, constant power generation (CPG) is imposed by grid codes. An algorithm for the calculation of the photovoltaic panel voltage reference, which generates a constant power from the PVPP, is introduced in this paper. The key novelty of the proposed algorithm is its applicability for both single-and two-stage PVPPs and flexibility to move the operation point to the right or left side of the MPP. Furthermore, the execution frequency of the algorithm and voltage increments between consecutive operating points are modified based on a hysteresis band controller in order to obtain fast dynamic response under transients and low-power oscillation during steady-state operation. The performance of the proposed algorithm for both single-and two-stage PVPPs is examined on a 50-kVA simulation setup of these topologies. Moreover, experimental results on a 1-kVA PV system validate the effectiveness of the proposed algorithm under various operating conditions, demonstrating functionalities of the proposed CPG algorithm.
AB - Photovoltaic power plants (PVPPs) typically operate by tracking the maximum power point (MPP) in order to maximize the conversion efficiency. However, with the continuous increase of installed grid-connected PVPPs, power system operators have been experiencing new challenges, such as overloading, overvoltages, and operation during grid-voltage disturbances. Consequently, constant power generation (CPG) is imposed by grid codes. An algorithm for the calculation of the photovoltaic panel voltage reference, which generates a constant power from the PVPP, is introduced in this paper. The key novelty of the proposed algorithm is its applicability for both single-and two-stage PVPPs and flexibility to move the operation point to the right or left side of the MPP. Furthermore, the execution frequency of the algorithm and voltage increments between consecutive operating points are modified based on a hysteresis band controller in order to obtain fast dynamic response under transients and low-power oscillation during steady-state operation. The performance of the proposed algorithm for both single-and two-stage PVPPs is examined on a 50-kVA simulation setup of these topologies. Moreover, experimental results on a 1-kVA PV system validate the effectiveness of the proposed algorithm under various operating conditions, demonstrating functionalities of the proposed CPG algorithm.
KW - Constant power generation
KW - Photovoltaic panel power-voltage curve
KW - Photovoltaic systems
KW - Single- and two-stage photovoltaic power conversion
KW - Voltage reference calculation
KW - Constant power generation (CPG)
KW - PV systems
KW - Photovoltaic (PV) panel power-voltage curve
KW - Single-and two-stage PV power conversion
UR - http://www.scopus.com/inward/record.url?scp=85023181544&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2017.2724544
DO - 10.1109/TPEL.2017.2724544
M3 - Journal article
AN - SCOPUS:85023181544
SN - 0885-8993
VL - 33
SP - 4088
EP - 4101
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 5
M1 - 7973033
ER -