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Recent Advances in Electrical & Electronic Engineering

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ISSN (Print): 2352-0965
ISSN (Online): 2352-0973

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Research Article

A New Current Limiting Strategy Based on Id − ω and Iq − V Droop Characteristics for Grid-Connected Distributed Generations

Author(s): Abdolhossein Saleh*

Volume 16, Issue 3, 2023

Published on: 05 October, 2022

Page: [272 - 286] Pages: 15

DOI: 10.2174/2352096515666220907112517

Price: $65

Abstract

Background: Increase in the output current of inverter-based Distributed Generations (DGs), which are connected to an Upstream Grid (UG) and equipped with a droop controller, due to UG frequency and/or voltage magnitude drop is a conventional event. The first solution to limit the output currents is using current limiter circuits at the output side of the grid-connected droopcontrolled DG. Suppose the increasing output currents of this DG in continuous UG frequency drop exceeds their maximum. In that case, the current limiter circuits limit them to their maximum values. This limitation is based on the P-ω droop characteristic due to instability because the DG frequency will be greater than the UG frequency. This difference leads to sending and receiving power between DG and UG. Different methods have been presented in the literature to overcome this problem.

Methods: This paper proposes a method based on a floating droop controller. In this method, in order to limit output currents strictly, Iod − ω and Ioq − v droop characteristics are used instead of P - ω and Q - v characteristics, respectively. In the proposed method, the droop curves are moved downward instead of increasing the droop coefficients to limit currents. Also, two transient supplementary signals are proposed to ensure that instantaneous currents do not overshoot in the transient state.

Results: Small-signal stability analysis shows that the system remains stable under the proposed controller. Moreover, the proposed strategy performance is indicated by time-domain simulation results using MATLAB/Simulink software under different case studies.

Conclusion: The proposed new method limits the output currents of grid-connected droopcontrolled DG without using current limiter circuits and performs a stable operation under the abnormal conditions of the grid.

Keywords: Current limiting, Droop controller, Distributed Generation, Grid-connected, Grid frequency drop, Grid voltage magnitude drop

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[1]
C. Zhang, and Y. Xu, "Hierarchically-coordinated voltage/VAR control of distribution networks using PV inverters", IEEE Trans. Smart Grid, vol. 11, no. 4, pp. 2942-2953, 2020.
[http://dx.doi.org/10.1109/TSG.2020.2968394]
[2]
G. Raman, J.C.H. Peng, and H.H. Zeineldin, "Optimal damping recovery scheme for droop-controlled inverter-based microgrids", IEEE Trans. Smart Grid, vol. 11, no. 4, pp. 2805-2815, 2020.
[http://dx.doi.org/10.1109/TSG.2020.2966244]
[3]
Y. Gupta, S. Doolla, K. Chatterjee, and B.C. Pal, "Optimal DG allocation and volt–var dispatch for a droop-based microgrid", IEEE Trans. Smart Grid, vol. 12, no. 1, pp. 169-181, 2021.
[http://dx.doi.org/10.1109/TSG.2020.3017952]
[4]
N.M. Dehkordi, and S.Z. Moussavi, "Distributed resilient adaptive control of islanded microgrids under sensor/actuator faults", IEEE Trans. Smart Grid, vol. 11, no. 3, pp. 2699-2708, 2020.
[http://dx.doi.org/10.1109/TSG.2019.2960205]
[5]
Q.C. Zhong, and G.C. Konstantopoulos, "Current-limiting droop control of grid-connected inverters", IEEE Trans. Ind. Electron., vol. 64, no. 7, pp. 5963-5973, 2017.
[http://dx.doi.org/10.1109/TIE.2016.2622402]
[6]
M. Eskandari, and A.V. Savkin, "On the impact of fault ridethrough on transient stability of autonomous microgrids: Nonlinear analysis and solution", IEEE Trans. Smart Grid, vol. 12, no. 2, pp. 999-1010, 2021.
[http://dx.doi.org/10.1109/TSG.2020.3030015]
[7]
Y. Peng, Z. Shuai, X. Liu, Z. Li, J.M. Guerrero, and Z.J. Shen, "Modeling and stability analysis of inverter-based microgrid under harmonic conditions", IEEE Trans. Smart Grid, vol. 11, no. 2, pp. 1330-1342, 2020.
[http://dx.doi.org/10.1109/TSG.2019.2936041]
[8]
M. Ganjian-Aboukheili, M. Shahabi, Q. Shafiee, and J.M. Guerrero, "Seamless transition of microgrids operation from grid-connected to islanded mode", IEEE Trans. Smart Grid, vol. 11, no. 3, pp. 2106-2114, 2020.
[http://dx.doi.org/10.1109/TSG.2019.2947651]
[9]
Y. Geng, L. Zhu, X. Song, K. Wang, and X. Li, "A modified droop control for grid-connected inverters with improved stability in the fluctuation of grid frequency and voltage magnitude", IEEE Access, vol. 7, pp. 75658-75669, 2019.
[http://dx.doi.org/10.1109/ACCESS.2019.2920312]
[10]
X. Guo, W. Liu, and Z. Lu, "Flexible power regulation and currentlimited control of the grid-connected inverter under unbalanced grid voltage faults", IEEE Trans. Ind. Electron., vol. 64, no. 9, pp. 7425-7432, 2017.
[http://dx.doi.org/10.1109/TIE.2017.2669018]
[11]
A. Camacho, M. Castilla, J. Miret, A. Borrell, and L.G. de Vicuña, "Active and reactive power strategies with peak current limitation for distributed generation inverters during unbalanced grid faults", IEEE Trans. Ind. Electron., vol. 62, no. 3, pp. 1515-1525, 2015.
[http://dx.doi.org/10.1109/TIE.2014.2347266]
[12]
S. Dedeoglu, and G.C. Konstantopoulos, "Three-phase gridconnected inverters equipped with nonlinear current- limiting control", International Conference on Control (CONTROL), 05-07 Sept 2018, Sheffield, UK, pp. 38-43, 2018.
[http://dx.doi.org/10.1109/CONTROL.2018.8516764]
[13]
S. Dedeoglu, G.C. Konstantopoulos, and A.G. Paspatis, "Grid-supporting three-phase inverters with inherent root mean square current limitation under balanced grid voltage sags", IEEE Trans. Ind. Electron., vol. 68, no. 11, pp. 11379-11389, 2021.
[http://dx.doi.org/10.1109/TIE.2020.3034860]
[14]
X. Lu, J. Wang, J.M. Guerrero, and D. Zhao, "Virtual-impedance-based fault current limiters for inverter dominated AC microgrids", IEEE Trans. Smart Grid, vol. 9, no. 3, pp. 1599-1612, 2018.
[http://dx.doi.org/10.1109/TSG.2016.2594811]
[15]
H. Yazdanpanahi, Y.W. Li, and W. Xu, "A new control strategy to mitigate the impact of inverter-based DGs on protection system", IEEE Trans. Smart Grid, vol. 3, no. 3, pp. 1427-1436, 2012.
[http://dx.doi.org/10.1109/TSG.2012.2184309]
[16]
D.M. Vilathgamuwa, P.C. Loh, and Y. Li, "Protection of microgrids during utility voltage sags", IEEE Trans. Ind. Electron., vol. 53, no. 5, pp. 1427-1436, 2006.
[http://dx.doi.org/10.1109/TIE.2006.882006]
[17]
H.J. Laaksonen, "Protection principles for future microgrids", IEEE Trans. Power Electron., vol. 25, no. 12, pp. 2910-2918, 2010.
[http://dx.doi.org/10.1109/TPEL.2010.2066990]
[18]
X. Guo, W. Liu, X. Zhang, X. Sun, Z. Lu, and J.M. Guerrero, "Flexible control strategy for grid-connected inverter under unbalanced grid faults without PLL", IEEE Trans. Power Electron., vol. 30, no. 4, pp. 1773-1778, 2015.
[http://dx.doi.org/10.1109/TPEL.2014.2344098]
[19]
Z. Chen, X. Pei, M. Yang, L. Peng, and P. Shi, "A novel protection scheme for inverter- interfaced microgrid (iim) operated in islanded mode", IEEE Trans. Power Electron., vol. 33, no. 9, pp. 7684-7697, 2017.
[http://dx.doi.org/10.1109/TPEL.2017.2769559]
[20]
I. Sadeghkhani, M.E. Hamedani Golshan, J.M. Guerrero, and A. Mehrizi-Sani, "A current limiting strategy to improve fault ride-through of inverter interfaced autonomous microgrids", IEEE Trans. Smart Grid, vol. 8, no. 5, pp. 2138-2148, 2016.
[21]
E. Afshari, G.R. Moradi, R. Rahimi, B. Farhangi, Y. Yang, F. Blaabjerg, and Farhangi S., "Control strategy for three-phase grid-connected PV inverters enabling current limitation under unbalanced faults", IEEE Trans. Power Electron., vol. 64, no. 11, pp. 8908-8918, 2017.
[22]
S. Yazdani, M. Ferdowsi, M. Davari, and P. Shamsi, "Advanced current-limiting and power-sharing control in a pv-based grid-forming inverter under unbalanced grid conditions", IEEE Trans. Power Electron., vol. 8, pp. 1084-1096, 2019.
[23]
A.G. Paspatis, G.C. Konstantopoulos, and J.M. Guerrero, "Enhanced current-limiting droop controller for grid-connected inverters to guarantee stability and maximize power injection under grid faults", IEEE Trans. Control Syst. Technol., vol. 29, no. 2, pp. 841-849, 2021.
[http://dx.doi.org/10.1109/TCST.2019.2955920]
[24]
A. Saleh, A. Rastegarnia, A. Farzamnia, and K.T.T. Kin, "Power and current limiting strategy based on droop controller with floating characteristic for grid-connected distributed generations", IEEE Access, vol. 10, pp. 13966-13973, 2022.
[http://dx.doi.org/10.1109/ACCESS.2022.3146147]
[25]
A. Saleh, A. Deihimi, and R. Iravani, "Model predictive control of distributed generations with feed-forward output currents", IEEE Trans. Smart Grid, vol. 10, no. 2, pp. 1488-1500, 2019.
[http://dx.doi.org/10.1109/TSG.2017.2768432]
[26]
A. Saleh, "Modeling, small-signal stability analyzing and implementing of an inverter-based distributed generation with feedforwarded model predictive controller", AUT J. Electric. Engin., vol. 53, no. 2, pp. 261-286, 2021.

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