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| Development of a new pole-slip protection function for synchronous machines / Lafras Lamont | |
| Lamont;Lafras | |
| 出版年 | 2011 |
| 学位授予单位 | North-West University |
| 英文摘要 | The rotor shaft of a synchronous machine can experience severe mechanical stress due to torque pulsations during a pole-slip condition. All pole-slip protection relays currently on the market use the impedance pole-slip protection method to detect a pole-slip. No commercial relay currently available can predict accurately when a generator is about to experience a damaging pole-slip. All the relays will only trip a generator after it has pole-slipped one or more times. Severe mechanical damage could be caused to a machine after only one pole-slip. It is therefore essential to enhance pole-slip protection relays to such an extent that it can trip a generator before it pole slips. The proposed pole-slip protection function must predict when a generator will become unstable during a network fault. As soon as instability is predicted, the generator must be tripped before the fault is cleared to avoid damaging post-fault torque effects. Conventional impedance pole-slip protection methods are are also discussed and the shortcomings of impedance pole-slip protection are investigated. The new pole-slip protection function was designed by using PSCAD. Detailed PSCAD simulations on different network configurations proved that the new pole-slip protection function will trip a generator before a damaging pole-slip occurs. The new pole-slip protection function was also implemented on an ABB REM543 multifunctional protection relay and tested on a RTDS. The concept of the new pole-slip function was successfully demonstrated on the protection relay. The operation of conventional impedance scheme relays was compared with the proposed pole-slip function for different fault conditions. Although the new pole-slip protection function is more complex than the existing impedance functions, it was concluded that similar skills are required to test and commission the new protection function. The new pole-slip function outperforms the impedance protection methods, since the new protection function can trip the generator before it pole-slips. PhD (Electrical Engineering), North-West University, Potchefstroom Campus, 2011 |
| 英文关键词 | Synchronous generators Pole-slip protection Out-of-step Power system stability Powerswing Equal area criteria Impedance protection |
| 语种 | 英语 |
| URL | http://hdl.handle.net/10394/9730 |
| 来源机构 | North-West University |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/246027 |
| 推荐引用方式 GB/T 7714 | Lamont;Lafras. Development of a new pole-slip protection function for synchronous machines / Lafras Lamont[D]. North-West University,2011. |
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