【摘要】：針對傳統(tǒng)三段式電流保護應用于風電場集電線時選擇性和速動性不能兼顧的問題,在分析風電場集電線拓撲結構和故障特征的基礎上,結合熔斷器保護曲線和風機的低電壓穿越特性,提出了一種能適用于風電場集電線的反時限電流保護新方法。以直驅風電場為對象,分析得出了傳統(tǒng)三段式電流保護不適應于風電場集電線保護的結論,并且給出了新方法的整定原則,即根據熔斷器下游經不同過渡阻抗故障后集電線電流與熔斷器電流的最大差值關系得到集電線反時限電流保護的理論曲線,最后借助EMTP-PSCAD軟件平臺搭建直驅風電場模型對理論分析進行了驗證。仿真結果表明,對于風電場集電線保護,反時限電流保護新方法由于采用了連續(xù)的電流保護曲線,能夠很好地與熔斷器保護相配合,克服了傳統(tǒng)三段式電流保護范圍小、易造成保護越級跳閘、風機脫網等缺點,而且有很強的抗過渡電阻能力,在不同的故障條件下能快速可靠地動作,兼顧了繼電保護選擇性和速動性的要求,因此具有一定的工程實用價值。
[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.
【作者單位】： 西安交通大學電氣工程學院;廣州供電局電力調度控制中心;
【基金】：國家重點基礎研究發(fā)展計劃資助項目(2012CB215105)
【分類號】：TM614;TM77

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本文編號：2340014