Ancillary Services of a Grid-Connected Inverter with Overcurrent Protection Capability under Voltage Sag

Sepannur Bandri(1), Zuriman Anthony(2), Rafika Andari(3), Fauzan Ismail(4),

(1) Padang Institute of Technology
(2) Padang Institute of Technology
(3) Padang Institute of Technology
(4) Padang Institute of Technology


The Distributed Generator of a Photovoltaic System (DGPVS) is an essential factor for future power plant generation, and it can be created by connecting multiple small power plant generators in a microgrid system. This paper focuses on the overcurrent protection of a three-phase grid-connected inverter (3P-GCI) under voltage sag conditions in sustaining connection loss between the 3P-GCI and the primary grid, which involves voltage instability. The ancillary service shows more advantage in overcurrent protection during voltage sags, which limits the generated current under sag duration. Its service can protect the inverter and avoid more disturbances to the primary grid because the 3P-GCI remains connected. Proposed LVRT strategy with limit current feature play the role to protect 3P-GCI under voltage sag. In the normal grid, the 3P-GCI can inject 302W of active power with a power factor (PF) equal to one. 1.4% of VTHD and 4.3% of ITHD shows the performance of the proposed system. Meanwhile, the 3P-GCI injects 239VAr reactive power and reduces injected active power to 135W which is essential to remain connected to the primary grid during voltage sags and limit the generated current. The validation results show that this prototype successfully compensates for the grid voltage drops by injecting 239Var of reactive power and limiting its generated current to 1.592A.


active power; distribute generator; inverter; reactive power; voltage sag

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K. Handayani and P. Anugrah, “Assessing the implications of net-zero emissions pathways: An analysis of the Indonesian power sector,” ICT-PEP 2021 - International Conference on Technology and Policy in Energy and Electric Power: Emerging Energy Sustainability, Smart Grid, and Microgrid Technologies for Future Power System, Proceedings, pp. 270–275, 2021, doi: 10.1109/ICT-PEP53949.2021.9600954.

Y. Zhou et al., “Application of Distributed Ledger Technology in Distribution Networks,” Proceedings of the IEEE, vol. 110, no. 12, pp. 1963–1975, 2022, doi: 10.1109/JPROC.2022.3181528.

X. Zhao, L. Chang, R. Shao, and K. Spence, “Power System Support Functions Provided by Smart Inverters—A Review,” CPSS Transactions on Power Electronics and Applications, vol. 3, no. 1, pp. 25–35, 2018.

T. S. Ustun, K. Otani, Y. Aoto, and J. U. N. Hashimoto, “Optimal PV-INV Capacity Ratio for Residential Smart Inverters Operating Under Different Control Modes,” IEEE Access, vol. 8, 2020, doi: 10.1109/ACCESS.2020.3003949.

J. Joshi, A. K. Swami, V. Jately, and B. Azzopardi, “A Comprehensive Review of Control Strategies to Overcome Challenges during LVRT in PV Systems,” IEEE Access, vol. 9, pp. 121804–121834, 2021, doi: 10.1109/ACCESS.2021.3109050.

F. Wang, J. L. Duarte, and M. A. M. Hendrix, “Pliant active and reactive power control for grid-interactive converters under unbalanced voltage dips,” IEEE Trans Power Electron, vol. 26, no. 5, pp. 1511–1521, 2011, doi: 10.1109/TPEL.2010.2052289.

IEEE Standard 1547, IEEE Standard for Interconnecting Distributed Resources with Electric Power Systems. 2003.

M. R. Islam and H. A. Gabbar, “Study of Micro Grid Safety & Protection Strategies with Control System Infrastructures,” Smart Grid and Renewable Energy, vol. 3, no. 1, pp. 1–9, 2012, doi: 10.4236/sgre.2012.31001.

B. Mirafzal, “On Grid-Interactive Smart Inverters : Features and Advancements,” IEEE Access, vol. 8, pp. 160526–160536, 2020, doi: 10.1109/ACCESS.2020.3020965.

M. M. Koutenaei, G. S. Member, and T. Nguyen, “Efficient Phasor-Based Dynamic Volt / VAr and Volt / Watt Analysis of Large Distribution Grid With High Penetration of Smart Inverters,” IEEE Trans Smart Grid, vol. 13, no. 5, pp. 3997–4008, 2022, doi: 10.1109/TSG.2021.3138741.

R. Capability, M. Easley, S. Member, S. Jain, and M. Shadmand, “Autonomous Model Predictive Controlled Smart Inverter With Proactive Grid Fault,” vol. 35, no. 4, pp. 1825–1836, 2020, doi: 10.1109/TEC.2020.2998501.

F. Ismail, A. Effendi, and W. Witrionanda, “Power Injection on Single Phase Grid System,” Elkha, vol. 11, no. 1, p. 47, 2019, doi: 10.26418/elkha.v11i1.30932.

D. Pal, B. K. Panigrahi, and S. Member, “Small Signal Stability Analysis Oriented Design of Hybrid Anti-Islanding Protection Technique Based on Active Disturbance Injection,” IEEE Syst J, vol. 16, no. 1, pp. 1448–1459, 2022, doi: 10.1109/JSYST.2021.3050468.

D. Motter and J. Vieira, “Influence of a Step-Voltage Regulator on Synchronous DG Anti-Islanding Protection,” IEEE Latin America Transactions, vol. 17, no. 6, pp. 897–906, 2019.

C. M. Vieira, “Hardware Implementation and Real-Time Evaluation of an ANN-Based Algorithm for Anti-Islanding Protection of Distributed Generators,” IEEE Transactions on Industrial Electronics, vol. 65, no. 6, pp. 5051–5059, 2018, doi: 10.1109/TIE.2017.2767524.

O. Raipala, S. Member, A. S. Mäkinen, S. M. Ieee, and S. Repo, “An Anti-islanding Protection Method Based on Reactive Power Injection and ROCOF,” IEEE Transactions on Power Delivery, vol. 32, no. 1, pp. 401–410, 2017, doi: 10.1109/TPWRD.2016.2543503.

A. M. Dissanayake, S. Member, and N. C. Ekneligoda, “Transient Optimization of Parallel Connected Inverters in Islanded AC Microgrids,” IEEE Trans Smart Grid, vol. 10, no. 5, pp. 4951–4961, 2019, doi: 10.1109/TSG.2018.2871413.

W. Liang, Y. Liu, and Y. Shen, “Active Power Control Integrated With Reactive Power Compensation of Battery Energy Stored Quasi-Z Source Inverter PV Power System Operating in VSG Mode,” IEEE J Emerg Sel Top Power Electron, vol. 11, no. 1, pp. 339–350, 2023, doi: 10.1109/JESTPE.2021.3137397.

D. I. Brandao, F. E. G. Mendes, R. V. Ferreira, S. M. Silva, and I. A. Pires, “Active and reactive power injection strategies for three-phase four-wire inverters during symmetrical/asymmetrical voltage sags,” IEEE Trans Ind Appl, vol. 55, no. 3, pp. 2347–2355, 2019, doi: 10.1109/TIA.2019.2893135.

A. Rosini, A. Labella, A. Bonfiglio, R. Procopio, and J. M. Guerrero, “A review of reactive power sharing control techniques for islanded microgrids,” vol. 141, no. May 2020, 2021.

H. Liu et al., “Seamless Transfer Scheme With Unified Control Core for Paralleled Systems,” IEEE Trans Power Electron, vol. 34, no. 7, pp. 6286–6298, 2019.

X. Liu et al., “Fault Current Hierarchical Limitation Strategy for Fault Ride-Through Scheme of Microgrid,” IEEE Trans Smart Grid, vol. 10, no. 6, pp. 6566–6579, 2019, doi: 10.1109/TSG.2019.2907545.

A. Khoshooei, J. S. Moghani, I. Candela, and P. Rodriguez, “Control of D-STATCOM during Unbalanced Grid Faults Based on DC Voltage Oscillations and Peak Current Limitations,” IEEE Trans Ind Appl, vol. 54, no. 2, pp. 1680–1690, 2018, doi: 10.1109/TIA.2017.2785289.

X. Zhao, J. M. Guerrero, M. Savaghebi, J. C. Vasquez, X. Wu, and K. Sun, “Low-voltage ride-through operation of power converters in grid-interactive microgrids by using negative-sequence droop control,” IEEE Trans Power Electron, vol. 32, no. 4, pp. 3128–3142, 2017, doi: 10.1109/TPEL.2016.2570204.

N. Bottrell and T. C. Green, “Comparison of current-limiting strategies during fault ride-through of inverters to prevent latch-up and wind-up,” IEEE Trans Power Electron, vol. 29, no. 7, pp. 3786–3797, 2014, doi: 10.1109/TPEL.2013.2279162.

H. R. Baghaee, M. Mirsalim, G. B. Gharehpetian, and H. A. Talebi, “A new current limiting strategy and fault model to improve fault ride-through capability of inverter interfaced DERs in autonomous microgrids,” Sustainable Energy Technologies and Assessments, vol. 24, pp. 71–81, 2017, doi: 10.1016/j.seta.2017.02.004.

Q. Liu, T. Caldognetto, and S. Buso, “Review and Comparison of Grid-Tied Inverter Controllers in Microgrids,” IEEE Trans Power Electron, vol. 35, no. 7, pp. 7624–7639, 2020, doi: 10.1109/TPEL.2019.2957975.

L. Di Benedetto et al., “A Hardware Architecture for SVPWM Digital Control With Variable Carrier Frequency and Amplitude,” IEEE Trans Industr Inform, vol. 18, no. 8, pp. 5330–5337, 2022.

Y. Li, Y. Gu, S. Member, and T. C. Green, “Revisiting Grid-Forming and Grid-Following Inverters : A Duality Theory,” IEEE Transactions on Power Systems, vol. 37, no. 6, pp. 4541–4554, 2022, doi: 10.1109/TPWRS.2022.3151851.

Y. Kumsuwan and Y. Sillapawicharn, “A fast synchronously rotating reference frame-based voltage sag detection under practical grid voltages for voltage sag compensation systems,” IET Conference Publications, vol. 2012, no. 592 CP, 2012, doi: 10.1049/cp.2012.0348.

Y. Yang, H. Wang, and F. Blaabjerg, “Reactive power injection strategies for single-phase photovoltaic systems considering grid requirements,” IEEE Trans Ind Appl, vol. 50, no. 6, pp. 4065–4076, 2014, doi: 10.1109/TIA.2014.2346692.

Y. Bae, T. K. Vu, and R. Y. Kim, “Implemental control strategy for grid stabilization of grid-connected PV system based on German grid code in symmetrical low-to-medium voltage network,” IEEE Transactions on Energy Conversion, vol. 28, no. 3, pp. 619–631, 2013, doi: 10.1109/TEC.2013.2263885.

R. Ntare, N. H. Abbasy, and K. H. M. Youssef, “Low Voltage Ride through Control Capability of a Large Grid Connected PV System Combining DC Chopper and Current Limiting Techniques,” Journal of Power and Energy Engineering, vol. 7, no. 1, pp. 62–79, 2019, doi: 10.4236/jpee.2019.71004.


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