TY - JOUR
T1 - A modified Aalborg inverter extracting maximum power from one PV array source
AU - Wang, Houqing
AU - Wu, Weimin
AU - Zhang, Shuai
AU - He, Yuanbin
AU - Chung, Henry Shu-hung
AU - Blaabjerg, Frede
PY - 2019/7
Y1 - 2019/7
N2 - Distributed Photovoltaic Generation (DPVG) systems have become more important in recent years because of energy pinch and air pollution. Grid-tied inverters, as the indispensable parts of the DPVG systems, have drawn a lot of research attentions. Among various constructors, the Aalborg inverter was proposed as a candidate for the interface between the PV arrays and the power grid for some potential advantages, such as the wide range of input DC voltages, high efficiency, low cost and no leakage current. For a conventional Aalborg inverter, however, in order to gain a symmetrical gird-injected current, when the input DC voltages generated by the PV arrays are not equal, part of the input DC energy has to be discarded, which will reduce the conversion efficiency of the whole system. In this paper, a modified Aalborg inverter with a single input DC source is proposed to extract the maximum DC energy of PV arrays. The operating principle is illustrated via equivalent circuits. The control strategy is designed to balance the capacitor voltages and smooth the grid-injected current. A 110 V/50 Hz/800 W prototype has been built to verify the validity of the proposed inverter together with the effectiveness of the control strategy.
AB - Distributed Photovoltaic Generation (DPVG) systems have become more important in recent years because of energy pinch and air pollution. Grid-tied inverters, as the indispensable parts of the DPVG systems, have drawn a lot of research attentions. Among various constructors, the Aalborg inverter was proposed as a candidate for the interface between the PV arrays and the power grid for some potential advantages, such as the wide range of input DC voltages, high efficiency, low cost and no leakage current. For a conventional Aalborg inverter, however, in order to gain a symmetrical gird-injected current, when the input DC voltages generated by the PV arrays are not equal, part of the input DC energy has to be discarded, which will reduce the conversion efficiency of the whole system. In this paper, a modified Aalborg inverter with a single input DC source is proposed to extract the maximum DC energy of PV arrays. The operating principle is illustrated via equivalent circuits. The control strategy is designed to balance the capacitor voltages and smooth the grid-injected current. A 110 V/50 Hz/800 W prototype has been built to verify the validity of the proposed inverter together with the effectiveness of the control strategy.
KW - Aalborg inverter
KW - Buck-converter
KW - Maximum power point tracking (MPPT)
KW - Photovoltaic system
KW - Voltage balance
U2 - 10.24295/CPSSTPEA.2019.00011
DO - 10.24295/CPSSTPEA.2019.00011
M3 - Journal article
SN - 2475-742X
VL - 4
SP - 109
EP - 118
JO - CPSS Transactions on Power Electronics and Applications
JF - CPSS Transactions on Power Electronics and Applications
IS - 2
M1 - 8758250
ER -