TY - JOUR
T1 - A Novel γ Control for Enhancing Voltage Regulation of Electric Springs in Low-Voltage Distribution Networks
AU - He, Yufei
AU - Wang, Minghao
AU - Xu, Zhao
AU - Jia, Youwei
N1 - Funding Information:
This work was supported in part by the National Natural Science Foundation of China under Grant 62101473 and in part by Environment and Conservation Fund and Woo Wheelock Green Fund 108/2021.
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2023/3/1
Y1 - 2023/3/1
N2 - Electric springs (ES) have been reported as a distributed means to address the voltage instability issues at the point of common coupling (PCC) in low-voltage distribution networks (LVDN). In the reported research works on the control methods of the ES, it is generally assumed that the grid networks are predominately inductive. This assumption is fundamentally flawed as the line impedances are significantly resistive in LVDN, which leads to deteriorated voltage regulation effects. To address this, a novel γ control method is proposed to enhance the voltage regulation performances of the ES in LVDN. A comprehensive steady-state model of the ES-based smart load considering different Thevenin's equivalent line impedances is developed in this article. Equivalent regulation points and optimal operating regions of this smart load are derived analytically. The proposed control embeds a smart load model and enables adaptive control boundaries of the ES, which can avoid the suboptimal or positive-feedback operations in the PCC voltage regulation. Besides, a hysteresis proportional integral (PI) controller is designed to mitigate the voltage flickers. Experimental and simulation results have been provided to verify the effectiveness of the proposed γ control.
AB - Electric springs (ES) have been reported as a distributed means to address the voltage instability issues at the point of common coupling (PCC) in low-voltage distribution networks (LVDN). In the reported research works on the control methods of the ES, it is generally assumed that the grid networks are predominately inductive. This assumption is fundamentally flawed as the line impedances are significantly resistive in LVDN, which leads to deteriorated voltage regulation effects. To address this, a novel γ control method is proposed to enhance the voltage regulation performances of the ES in LVDN. A comprehensive steady-state model of the ES-based smart load considering different Thevenin's equivalent line impedances is developed in this article. Equivalent regulation points and optimal operating regions of this smart load are derived analytically. The proposed control embeds a smart load model and enables adaptive control boundaries of the ES, which can avoid the suboptimal or positive-feedback operations in the PCC voltage regulation. Besides, a hysteresis proportional integral (PI) controller is designed to mitigate the voltage flickers. Experimental and simulation results have been provided to verify the effectiveness of the proposed γ control.
KW - Electric springs
KW - line impedance
KW - low-voltage distribution networks
KW - smart load
UR - http://www.scopus.com/inward/record.url?scp=85141500369&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2022.3216845
DO - 10.1109/TPEL.2022.3216845
M3 - Journal article
AN - SCOPUS:85141500369
SN - 0885-8993
VL - 38
SP - 3739
EP - 3751
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 3
ER -