TY - JOUR
T1 - A Power-Decoupled Current-Source Inverter for PV Energy Harvest and Grid Voltage Regulation
AU - Wang, Ming Hao
AU - He, Yufei
AU - Jia, Youwei
AU - Xu, Zhao
N1 - Funding Information:
Manuscript received March 5, 2020; revised June 6, 2020, August 16, 2020, and September 2, 2020; accepted September 8, 2020. Date of publication September 29, 2020; date of current version June 28, 2021. This work was supported by the National Natural Science Foundation of China (NSFC) under Grant 71971183 and Grant 72071100. (Corresponding author: Yufei He.) Ming-Hao Wang, Yufei He, and Zhao Xu are with the Research Institute for Smart Energy, and also with the Department of Electrical Engineering, The Hong Kong Polytechnic University, Hong Kong (e-mail: [email protected]; [email protected]; eezhaoxu@ polyu.edu.hk).
Publisher Copyright:
© 1982-2012 IEEE.
PY - 2021/10
Y1 - 2021/10
N2 - The single-phase microinverter (SMI) is becoming one of the most cost-efficient interfaces for bridging photovoltaics (PV) and power systems. However, in the maximum power point tracking operation, the SMI injects an intermittent active power to the grid, which leads to voltage variations at the point of common coupling (PCC). This certainly dampens the power quality of grids. Besides, the power mismatch between the dc and ac terminals of SMIs will render a double-line-frequency pulsating power at the dc terminal, which inevitably increases the power ratings of the circuit components of the SMIs. To address these issues simultaneously, a power-decoupled current-source inverter (PD-CSI) is proposed in this article. The PD-CSI can provide the required reactive power compensation for regulating the PCC voltage. Meanwhile, it is imbedded with an active power decoupling circuit, which can actively store the double-line-frequency pulsating power in a film capacitor so that the PV can be operated at a constant dc current. The state-space model and steady-state operation of the PD-CSI are elaborated. The controllers are designed for achieving the active power decoupling operation and the PCC voltage stabilization. Experimental and simulation results in an 110-V ac microgrid have been provided to validate the simultaneous functionalities of the active power decoupling and grid voltage regulation for the proposed PD-CSI.
AB - The single-phase microinverter (SMI) is becoming one of the most cost-efficient interfaces for bridging photovoltaics (PV) and power systems. However, in the maximum power point tracking operation, the SMI injects an intermittent active power to the grid, which leads to voltage variations at the point of common coupling (PCC). This certainly dampens the power quality of grids. Besides, the power mismatch between the dc and ac terminals of SMIs will render a double-line-frequency pulsating power at the dc terminal, which inevitably increases the power ratings of the circuit components of the SMIs. To address these issues simultaneously, a power-decoupled current-source inverter (PD-CSI) is proposed in this article. The PD-CSI can provide the required reactive power compensation for regulating the PCC voltage. Meanwhile, it is imbedded with an active power decoupling circuit, which can actively store the double-line-frequency pulsating power in a film capacitor so that the PV can be operated at a constant dc current. The state-space model and steady-state operation of the PD-CSI are elaborated. The controllers are designed for achieving the active power decoupling operation and the PCC voltage stabilization. Experimental and simulation results in an 110-V ac microgrid have been provided to validate the simultaneous functionalities of the active power decoupling and grid voltage regulation for the proposed PD-CSI.
KW - Active power decoupling
KW - reactive power compensation
KW - smart grid
UR - http://www.scopus.com/inward/record.url?scp=85109193224&partnerID=8YFLogxK
U2 - 10.1109/TIE.2020.3026264
DO - 10.1109/TIE.2020.3026264
M3 - Journal article
AN - SCOPUS:85109193224
SN - 0278-0046
VL - 68
SP - 9540
EP - 9549
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 10
M1 - 9209152
ER -