Abstract
Frequency regulation of autonomous microgrids with intermittent renewables is a tedious task, which requires additional support from energy storage systems (ESS). Ideally, the system requires a faster-acting ESS to arrest the initial frequency deviation and high energy capacity ESS to restore the frequency to its nominal value. Pico hydel energy storage (PHES) is one such high energy capacity ESS developed from the agricultural pumping systems. However, PHES has a slower response and cannot switch rapidly between pumping and generation modes. Hence, this paper incorporates a battery with PHES to achieve a faster dynamic response and absorb high-frequency power dynamics. Additionally, a frequency regulation strategy with synchronverter control is proposed to mimic synchronous machines, especially to reduce the rate of change of frequency (ROCOF) and frequency nadir. Firstly, a small-signal modelling approach is proposed, and it was utilized to assess the system stability through eigenvalue analysis. Subsequently, transient simulations were carried out to gauge the performance of the synchronverter strategy with vector control for frequency regulation. As a result, the frequency nadir and ROCOF were substantially reduced with the synchronverter strategy compared to the vector control based on the simulation results.
| Original language | English |
|---|---|
| Journal | IET Renewable Power Generation |
| Volume | 16 |
| Issue number | 2 |
| Pages (from-to) | 274-286 |
| Number of pages | 13 |
| ISSN | 1752-1416 |
| DOIs | |
| Publication status | Published - 3 Feb 2022 |
Bibliographical note
Funding Information:The authors would like to thank Universiti Tenaga Nasional, Malaysia, for providing the Internal Research Grant OPEX (J5100D4103‐BOLDREFRESH2025‐Centre of Excellence).
Publisher Copyright:
© 2021 The Authors. IET Renewable Power Generation published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology