Capacitive Element for Limiting VSC Fault Current in DC Grids
| Autor: | Masood Hajian, Dragan Jovcic, Mario Zaja |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
business.industry
Computer science 020209 energy Capacitive sensing Electrical engineering Thyristor Hardware_PERFORMANCEANDRELIABILITY 02 engineering and technology Fault (power engineering) Inductor Neutralization law.invention Overcurrent Bus voltage Capacitor Transmission (mechanics) law 0202 electrical engineering electronic engineering information engineering Voltage source business |
| Zdroj: | 2018 IEEE Power & Energy Society General Meeting (PESGM). |
| Popis: | Maintaining continuous voltage source converter operation under DC faults is one of main challenges in protection of DC transmission grids. In order to limit converter fault current below overcurrent tripping threshold (2-3 p.u.), impractically large inductors would be required in series with DC circuit breakers which would cause control-related issues. This paper proposes a novel shunt-connected protection device which, utilizing fault current sharing property of DC buses, reduces fault current contribution from the converter and improves DC bus voltage stability. Converter blocking can consequently be avoided with practically acceptable inductors. A case study is performed on a three-terminal offshore DC grid model developed in PSCAD. Peak fault current increase and bus voltage drop indicate greatly improved performance. Critical inductor size and critical fault neutralization time are analyzed for a range of protection system configurations and feasibility of such arrangements discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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