直驱风电场集电线保护研究
发布时间：2018-11-18 12:13
【摘要】：针对传统三段式电流保护应用于风电场集电线时选择性和速动性不能兼顾的问题,在分析风电场集电线拓扑结构和故障特征的基础上,结合熔断器保护曲线和风机的低电压穿越特性,提出了一种能适用于风电场集电线的反时限电流保护新方法。以直驱风电场为对象,分析得出了传统三段式电流保护不适应于风电场集电线保护的结论,并且给出了新方法的整定原则,即根据熔断器下游经不同过渡阻抗故障后集电线电流与熔断器电流的最大差值关系得到集电线反时限电流保护的理论曲线,最后借助EMTP-PSCAD软件平台搭建直驱风电场模型对理论分析进行了验证。仿真结果表明,对于风电场集电线保护,反时限电流保护新方法由于采用了连续的电流保护曲线,能够很好地与熔断器保护相配合,克服了传统三段式电流保护范围小、易造成保护越级跳闸、风机脱网等缺点,而且有很强的抗过渡电阻能力,在不同的故障条件下能快速可靠地动作,兼顾了继电保护选择性和速动性的要求,因此具有一定的工程实用价值。
[Abstract]:In view of the problem that the selectivity and quickness of the traditional three-stage current protection can not be taken into account when the wind farm gathers wires, the topology and fault characteristics of the collecting wires in the wind farm are analyzed. Based on the fuses protection curve and the low voltage traversing characteristics of the fan, a new method of inverse time current protection is proposed, which can be applied to wind farm collecting wires. Taking direct drive wind farm as an example, the conclusion that traditional three-stage current protection is not suitable for wind farm gathering wire protection is obtained, and the setting principle of the new method is given. According to the relationship between the maximum difference between the collector current and the fuse current after the fault of the fuse downstream through different transient impedance, the theoretical curve of the reverse time current protection of the collector wire is obtained. Finally, the theoretical analysis is verified by building a direct drive wind farm model based on EMTP-PSCAD software platform. The simulation results show that the new method of inverse time current protection can fit well with the fuse protection because of the continuous current protection curve, and overcome the small range of traditional three-segment current protection. It is easy to cause over-grade tripping of protection, detachable fan, and has strong resistance to transition resistance. It can move quickly and reliably under different fault conditions, taking into account the requirements of relay protection selectivity and quickness. Therefore, it has certain engineering practical value.
【作者单位】： 西安交通大学电气工程学院;广州供电局电力调度控制中心;
【基金】：国家重点基础研究发展计划资助项目(2012CB215105)
【分类号】：TM614;TM77
[Abstract]:In view of the problem that the selectivity and quickness of the traditional three-stage current protection can not be taken into account when the wind farm gathers wires, the topology and fault characteristics of the collecting wires in the wind farm are analyzed. Based on the fuses protection curve and the low voltage traversing characteristics of the fan, a new method of inverse time current protection is proposed, which can be applied to wind farm collecting wires. Taking direct drive wind farm as an example, the conclusion that traditional three-stage current protection is not suitable for wind farm gathering wire protection is obtained, and the setting principle of the new method is given. According to the relationship between the maximum difference between the collector current and the fuse current after the fault of the fuse downstream through different transient impedance, the theoretical curve of the reverse time current protection of the collector wire is obtained. Finally, the theoretical analysis is verified by building a direct drive wind farm model based on EMTP-PSCAD software platform. The simulation results show that the new method of inverse time current protection can fit well with the fuse protection because of the continuous current protection curve, and overcome the small range of traditional three-segment current protection. It is easy to cause over-grade tripping of protection, detachable fan, and has strong resistance to transition resistance. It can move quickly and reliably under different fault conditions, taking into account the requirements of relay protection selectivity and quickness. Therefore, it has certain engineering practical value.
【作者单位】： 西安交通大学电气工程学院;广州供电局电力调度控制中心;
【基金】：国家重点基础研究发展计划资助项目(2012CB215105)
【分类号】：TM614;TM77
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