Fuzzy Based VSG Control Technique for Dynamic Frequency Regulation Enhancement in AC Microgrid
| International Journal of Electrical and Electronics Engineering |
| © 2024 by SSRG - IJEEE Journal |
| Volume 11 Issue 11 |
| Year of Publication : 2024 |
| Authors : S. Nivedha, P. Lakshmi, P. Somasundaram |
10.14445/23488379/IJEEE-V11I11P135
How to Cite?
S. Nivedha, P. Lakshmi, P. Somasundaram, "Fuzzy Based VSG Control Technique for Dynamic Frequency Regulation Enhancement in AC Microgrid," SSRG International Journal of Electrical and Electronics Engineering, vol. 11, no. 11, pp. 373-380, 2024. Crossref, https://doi.org/10.14445/23488379/IJEEE-V11I11P135
Abstract:
Voltage Source Converter (VSC) interfaced with Distributed Generators (DG’s) in microgrids possess rapid frequency fluctuations in the event of disturbances due to lack of inertia. The Virtual Synchronous Generator (VSG) technique is employed to control the inverter and mimic the inertia characteristic of the synchronous generator. The VSG technique's Power-frequency (P-f) droop regulates frequency within permissible limits. The proportional controller is used to provide primary frequency control in P-f droop. To maintain the frequency at the nominal value when subjected to disturbances, frequency regulation is further enhanced by a secondary frequency controller. The integral controller is combined with the proportional controller in P-f droop to regulate the frequency at a nominal value. However, the PI controller in P-f droop regulates frequency slower, and the frequency oscillates in the event of disturbances. The dynamic frequency regulation can be enhanced with the fuzzy PI controller by regulating the frequency deviation faster at the nominal value. The improved dynamic frequency regulation maintains the frequency nadir of the microgrid and restores faster when subjected to disturbances. The fuzzy logic is introduced to enhance the dynamic frequency regulation in the proposed Fuzzy based VSG control technique. The adaptive variation of the PI controller gains with the Fuzzy Logic Controller (FLC) in the event of disturbances such as changes in load and mode of operation of DG, raising the frequency stability of DG. The performance of the proposed control technique is validated with simulations in MATLAB/Simulink.
Keywords:
Dynamic frequency regulation, Fuzzy Logic Controller, Inverter, Microgrid, Virtual Synchronous Generator.
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