A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation

Crescent Onyebuchi Omeje

doi:doi:10.11648/j.jeee.20231101.14

| Peer-Reviewed

A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation

Crescent Onyebuchi Omeje

Published in Journal of Electrical and Electronic Engineering (Volume 11, Issue 1)

Received: 17 February 2023 Accepted: 7 March 2023 Published: 16 March 2023

Views: Downloads:

Download PDF

Share This Article

Twitter
Linked In
Facebook

Abstract

This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (K_CP) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.

Published in	Journal of Electrical and Electronic Engineering (Volume 11, Issue 1)
DOI	10.11648/j.jeee.20231101.14
Page(s)	34-42
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Micro-Grid, LCL-Type Grid-Connected Converter, Current Control, Real and Reactive Power, THD

References

[1]	Hajilu, N. Gharehpetian, G. B. Hosseinian, S. H., Poursistani, M. R. and Kohansal, M. (2015). Power control strategy in islanded micro grids based on V-F and PQ theory using droop control of inverter 2015. International congress on Electric industry and automation. Shiraz, 24-25 Feb. 2015. htttps://doi.org/10.1109/ICE1A.2015.716584
[2]	Mahmoud, H. Michaelson, D. and Jiang, J. (2015). Decentralized power management of a PV/Battery hybrid unit in droop-controlled islanded micro grids. IEEE Transactions on Power Electronic, Vol. 30, pp. 7215-7229, 2015.
[3]	Bouzid, A. M. Guerrero, J. M. Cheriti, A., Bouhamida, M., Sicard, P. and Benghanem, M. (2015). A survey on control of Electric power distributed generation system for micro grid applications. Renewable and sustainable energy reviews. Vol. 44, pp. 751-766. 2015.
[4]	Solanki, A., Nasiri, A., Bhavaraju, V. Familliant, Y. L. and Fu. Q. A new framework for micro grid management: Virtual droop control. IEEE Transactions on Smart Grid, Vol. 7, pp. 554-566, 2016.
[5]	Kim, Y. S., Kim, E. S. and Moon, S. L Frequency and Voltage control strategy of standalone micro grids with high penetration of intermittent renewable generation system. IEEE Transactions on Power Systems, Vol. 31, pp. 718-728, 2016.
[6]	Zhang, P., Zhao, H. Cai, H. Shi, J. and He, X. Power decoupling strategy based on virtual negative resistor for inverters in low-voltage micro grids. IET Power Electronics, Vol. 9, pp. 1037-1044. 2020.
[7]	Sadabadi, M. S. Haddadi, A. Karimi, H. and Karimi, A. A robust active damping control strategy for an LCL-based grid connected DG unit. IEEE Trans. Ind. Electron., Vol. 69, no. 10, pp. 8055-8065, 2017.
[8]	Wu, W. Liu, Y. He, Y. Chung, H. S. Lisere, M. and Blaabjerg, F. Damping methods for resonance caused by LCL-filter based current controlled grid-tied power inverters: An overview. IEEE Trans. Ind. Electron., Vol. 64, no. 9, pp. 7402-7413, Sept. 2017.
[9]	Beres, R. N. Wang, X. Blaabjerg, F. Liserre, M. and Bak, C. I. Optimal design of high-order passive damped filters for grid-connected applications. IEEE Trans. Power Electron., Vol. 31, no. 3, pp. 2083-2098. March, 2016.
[10]	Rodriguez-Diaz, E. Freijedo, F. D. Vasquez, J. C. and Guerrero, J. M. Analysis and comparison of notch filter and capacitor voltage feed-forward active damping techniques for LCL grid-connected converters. IEEE Trans. Power Electron. Vol. 34, no. 4, pp. 3958-3972. April, 2019.
[11]	Ye, J. Shem, A. Zhang. Z, Xiu, J. and Wu. F. Systematic design of the hybrid damping method for three phase inverters with high-order filters. IEEE Trans. Power Electron. Vol. 33, no. 6, pp. 4944-4956, 2018.
[12]	Lee, J. Y. Cho, Y. P. Kim, H. S. and Jung, J. H. Design methodology of passive damped LCL filter using current controller for grid-connected three phase voltage source inverters. Journal of Power Electronics, Vol. 18, no. 4, pp. 1178-1185, 2018.
[13]	Yuan, H. and Jiang, X. A simple active damping method for active power filters, In Proc. APEC., pp. 917-912, 2016.
[14]	Gee, H. Zhen, Y. Wang, Y. and Wang, D. Research on LCL filter active damping strategy in active power filter system. In Proc. ICAIC, pp. 476-481, 2017.
[15]	Zhou, L. Inverter-current feedback resonance suppression method for LCL-type DG system to reduce resonance frequency offset and grid inductance effect. IEEE. Trans. Ind. Electron. Vol. 65, no. 9, pp. 7036-7045, Sept. 2018.
[16]	Pan, D. Ruan, X. Bao, C. Li, W. and Wang, X. Optimized controller design for LCL-type grid connected inverter to achieve high robustness against grid impedance variation. IEEE Trans. Ind. Electron. Vol. 62, no. 3, pp. 1537-1547, March, 2015.
[17]	Liu, Y. Wu, W. He, Y. Liu, Z. Blaabjerg, F. and Chung, H. S. H. An efficient and robust hybrid damper for LCL or LLCL-based grid tied inverter with strong grid-side harmonic voltage effect rejection. IEEE Trans. Ind. Electron. Vol. 63, no. 2, pp. 926-936, Feb. 2016.
[18]	Ben said-Romdhane, M. Naouar, M. W. Slama-Belkhodja, W. and Monimason, E. Robust active damping methods for LCL filter-based grid connected converters. IEEE Trans. Power Electron. Vol. 32, no. 9, pp. 6739-6750, Sept. 2017.
[19]	Adib, A. Mirafzal, Y. Wang, X. and Blaabjerg. On stability of voltage source inverters in weak grids. IEEE Access Vol. 6. pp. 4427-4439, 2018.
[20]	Cespedes, M. and Sun, J. Methods for stability analysis of unbalanced three phase system. In Proc. IEEE Energy. Convers. Congr. Expo. Sept. 2012, pp. 3090-3097.
[21]	Liu, W. Wang, X. and Blaabjerg, F. Modeling of unbalanced three phase grid-connected converters with decoupled transfer functions. In Proc. IEEE Energy Convers. Congr. Expo. 2018, pp. 3164-3169.
[22]	Jin, W. Li, Y. Sun, G. Chen, X. and Gao, Y. Stability analysis method for three phase multi-functional grid connected inverters with unbalanced local loads considering the active imbalance compensation. IEEE Access, Vol. 6, pp. 54865-54875, 2018.

Cite This Article

Plain Text BibTeX RIS

APA Style

Crescent Onyebuchi Omeje. (2023). A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. Journal of Electrical and Electronic Engineering, 11(1), 34-42. https://doi.org/10.11648/j.jeee.20231101.14

Copy | Download

ACS Style

Crescent Onyebuchi Omeje. A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. J. Electr. Electron. Eng. 2023, 11(1), 34-42. doi: 10.11648/j.jeee.20231101.14

Copy | Download

AMA Style

Crescent Onyebuchi Omeje. A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. J Electr Electron Eng. 2023;11(1):34-42. doi: 10.11648/j.jeee.20231101.14

Copy | Download

@article{10.11648/j.jeee.20231101.14,
  author = {Crescent Onyebuchi Omeje},
  title = {A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {11},
  number = {1},
  pages = {34-42},
  doi = {10.11648/j.jeee.20231101.14},
  url = {https://doi.org/10.11648/j.jeee.20231101.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20231101.14},
  abstract = {This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (KCP) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.},
 year = {2023}
}

Copy | Download

TY  - JOUR
T1  - A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation
AU  - Crescent Onyebuchi Omeje
Y1  - 2023/03/16
PY  - 2023
N1  - https://doi.org/10.11648/j.jeee.20231101.14
DO  - 10.11648/j.jeee.20231101.14
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 34
EP  - 42
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20231101.14
AB  - This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (KCP) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.
VL  - 11
IS  - 1
ER  -

Copy | Download

Author Information

Crescent Onyebuchi Omeje

Department of Electrical/Electronic Engineering, Faculty of Engineering, University of Port Harcourt, Port-Harcourt, Nigeria

Download PDF

Sections

Plain Text BibTeX RIS

APA Style

Crescent Onyebuchi Omeje. (2023). A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. Journal of Electrical and Electronic Engineering, 11(1), 34-42. https://doi.org/10.11648/j.jeee.20231101.14

Copy | Download

ACS Style

Crescent Onyebuchi Omeje. A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. J. Electr. Electron. Eng. 2023, 11(1), 34-42. doi: 10.11648/j.jeee.20231101.14

Copy | Download

AMA Style

Crescent Onyebuchi Omeje. A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation. J Electr Electron Eng. 2023;11(1):34-42. doi: 10.11648/j.jeee.20231101.14

Copy | Download

@article{10.11648/j.jeee.20231101.14,
  author = {Crescent Onyebuchi Omeje},
  title = {A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation},
  journal = {Journal of Electrical and Electronic Engineering},
  volume = {11},
  number = {1},
  pages = {34-42},
  doi = {10.11648/j.jeee.20231101.14},
  url = {https://doi.org/10.11648/j.jeee.20231101.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jeee.20231101.14},
  abstract = {This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (KCP) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.},
 year = {2023}
}

Copy | Download

TY  - JOUR
T1  - A Model Based LCL-Type Grid Connected Converter Under Balanced and Unbalanced Faults in a Micro-Grid Distributed Generation
AU  - Crescent Onyebuchi Omeje
Y1  - 2023/03/16
PY  - 2023
N1  - https://doi.org/10.11648/j.jeee.20231101.14
DO  - 10.11648/j.jeee.20231101.14
T2  - Journal of Electrical and Electronic Engineering
JF  - Journal of Electrical and Electronic Engineering
JO  - Journal of Electrical and Electronic Engineering
SP  - 34
EP  - 42
PB  - Science Publishing Group
SN  - 2329-1605
UR  - https://doi.org/10.11648/j.jeee.20231101.14
AB  - This research was conducted to verify the significance of the LCL-filter on the grid current and the impact of variable fault resistance values on the reactive power genereated in a grid-tied inverter. The stability of LCL-type grid connected inverter with capacitor current feedback in active damping state was evaluated in this paper. The effects of balanced and unbalanced grid faults on the active and reactive power was studied through simulation at different fault resistance values of 0.00025Ω and 2.5Ω. The FFT waveforms showed that THD values of 48.56% and 38.45% were achieved for the grid voltage at 0.00025Ω and 2.5Ω fault resistance while THD values of 9.50% and 4.41% were obtained for the grid current at a varied current feedback coefficient (KCP) of 4.75 and 14.75. Simulation results also showed that a very negligible real and reactive power was gained with a zero grid voltage within the fault zone at 0.00025Ω fault resistance. At a 2.5Ω fault resistance, a voltage sag was produced which accounted for the transient response in the real power generated and reactive power absorbed during the fault period. The result obtained from the root-locus plot showed that the loci for the derived LCL-filter current transfer function intersected at +j 8.734 and -j 8.734 which makes the system marginally stable All simulation procedures were realized in MATLAB/SIMULINK 2015.
VL  - 11
IS  - 1
ER  -

Copy | Download