Abstract
By applying virtual synchronous generator (VSG) method in high penetration level microgrids, current limiting issue under fault condition has become an important challenge. The main objective of this paper is to propose a novel current limiting strategy which has the capability of voltage tracking error reduction to avoid voltage controller saturation. This purpose is obtained by adaptive virtual impedance-based reference voltage correction during fault condition. Furthermore, positive and negative peak detection-based current limiting method implemented in double loop control system prepares soft transition ability. Moreover, this current limiting method generates the adaptive term of virtual impedance part. In contrast to conventional VSG methods, the proposed approach provides high quality voltage and current for microgrid in both grid-connected and islanded modes during fault conditions. The offline and hardware in the loop (HIL) simulation results confirm that the peak current of the inverter is restricted to the threshold value under symmetrical and asymmetrical faults for two operating modes of microgrid.
Original language | English |
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Journal | IEEE Transactions on Smart Grid |
Volume | 15 |
Issue number | 1 |
Pages (from-to) | 89-98 |
Number of pages | 10 |
ISSN | 1949-3053 |
DOIs | |
Publication status | Published - 1 Jan 2024 |
Bibliographical note
Publisher Copyright:IEEE
Keywords
- Adaptive virtual impedance
- current limiting
- Damping
- Limiting
- Mathematical models
- microgrid
- Microgrids
- peak detection
- Reactive power
- Torque
- virtual synchronous generator
- Voltage control