Investigation of a New Method for Synchronous Generator Loss of Excitation Protection
| Autor: | Gary Kobet, Ahmed Eltom, Enass Mohammed |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Generator (category theory) 020209 energy Electric generator 02 engineering and technology Power factor Permanent magnet synchronous generator AC power Topology law.invention Electric power system law Real Time Digital Simulator 0202 electrical engineering electronic engineering information engineering Electronic engineering Excitation |
| Zdroj: | 2019 IEEE Power & Energy Society General Meeting (PESGM). |
| DOI: | 10.1109/pesgm40551.2019.8973705 |
| Popis: | Loss of field (LOF) is detrimental to generator operation and, in some case, may lead to blackouts. Conventional loss of field protection schemes may not protect the generator under all operating conditions and are difficult to set. A recent study based on the polarities detection of $\boldsymbol{V}, \boldsymbol{Q}$ , and $\delta(\boldsymbol{V}\boldsymbol{Q}\delta)$ shows good promise; however, it is still based on software simulation and not fully tested. In this study, the $\boldsymbol{V}\boldsymbol{Q}\delta$ detection method is further explored, modified, and tested on the IEEE 9 bus system using a Real Time Digital simulator. A detection index has been calculated based on these new modifications. Two methods are used to estimate the rotor angle and both provide a similar estimation. The first method depends on the integration of the rotor speed over time, while the second method is based on equations presented in the published literature. The modified algorithm was tested under different loading as well as stable power swing (SPS) conditions. The algorithm has a shortcoming when the system is strong and able to supply reactive power to the generator. Under strong system conditions, the voltage may not drop below the threshold value to initiate calculations. Moreover, even when eliminating such a condition the index may not exceed its threshold value for a sufficient time period to allow the algorithm to detect the LOF event. The advantages and drawbacks of the published algorithm are discussed in this work. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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