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Operation Strategy of CVCF Inverter-based Micro-grid System Considering Energy Sinking

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Abstract

For the purpose of reducing carbon dioxide (CO2) emissions on island areas, operation methods of constant voltage and constant frequency (CVCF) inverter-based micro-grid(MG) system are being studied by replacing diesel generator with renewable energy sources (RES). However, in the operation of CVCF inverter-based MG system, phenomenon of energy sinking can be occurred when the total output power of RES is greater than total customer loads in inverter-based off-grid MG system. Where, the voltage of the battery system in CVCF inverter to form MG system can rapidly increase depending on the SOC(state of charge) condition, and then blackout in the entire MG system might be occurred due to the shut-down of CVCF inverter. Therefore, in order to overcome these problems, this paper presents transient operation algorithm based on 3 operation modes such as non-critical transient mode, critical transient mode and restoration mode, in order to prevent the shut-down of CVCF inverter with the energy sinking phenomenon in advance. Based on the proposed algorithm, this paper performs the modeling of 30 kW CVCF inverter-based MG system using PSCAD/EMTDC. From the simulation results based 3 operation modes, it is confirmed that the shut-down of the CVCF inverter can be prevented in advance according to operation conditions of SOC and voltage of the battery system in a CVCF inverter.

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Acknowledgements

This work was supported by the Development of safety evaluation index and establishment of facility standard based on demonstration for securing ESS safety of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20192910100250).

Funding

This work was supported by the Development of safety evaluation index and establishment of facility standard based on demonstration for securing ESS safety of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20192910100250). This work was supported by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20206910100090).

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Authors and Affiliations

  1. Department of Electrical, Electronics and Communication Engineering, Korea University of Technology and Education, Cheonan, Korea

    Hu-Dong Lee, Marito Ferreira, Dong-Hyun Tae & Dae-Seok Rho

  2. Department of R&D, Korea Electric Engineers Association, Seoul, Korea

    Il-Moo Lee

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  1. Hu-Dong Lee
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  2. Marito Ferreira
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  3. Dong-Hyun Tae
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  4. Il-Moo Lee
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Lee, HD., Ferreira, M., Tae, DH. et al. Operation Strategy of CVCF Inverter-based Micro-grid System Considering Energy Sinking. J. Electr. Eng. Technol. 17, 1605–1614 (2022). https://doi.org/10.1007/s42835-022-01057-8

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  • DOI: https://doi.org/10.1007/s42835-022-01057-8

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