| Abstract: |
| Introduction: With the development of flexible HVDC technology, the fault diagnosis of MMC-HVDC becomes a
new research direction.
Based on the fault diagnosis theory, this paper proposes a robust fault diagnosis method to study the fault
diagnosis problem of MMC-HVDC systems.
Methods: By optimizing the gain matrix in the fault observer, fault detection with good sensitivity and robustness
to disturbance is achieved. In the MMC-HVDC system, because of the inherently uncertain system and the presence
of various random disturbances, the study of robust fault diagnosis method is particularly important.
Results: Simulation studies during various AC faults have been carried out based on a 61-level MMC-HVDC
mathematical model. The results validate the feasibility and effectiveness of the proposed fault diagnosis method.
Conclusions: So this fault diagnosis method can be further applied to the actual project, to quickly achieve system
fault diagnosis and accurately complete fault identification. |
| Key words: Fault diagnosis, MMC-HVDC, Robust, State observer, Residual state equation |
| DOI：10.1186/s41601-016-0022-0 |
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| Fund: |
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