【摘要】：針對傳統(tǒng)三段式電流保護(hù)應(yīng)用于風(fēng)電場集電線時(shí)選擇性和速動(dòng)性不能兼顧的問題,在分析風(fēng)電場集電線拓?fù)浣Y(jié)構(gòu)和故障特征的基礎(chǔ)上,結(jié)合熔斷器保護(hù)曲線和風(fēng)機(jī)的低電壓穿越特性,提出了一種能適用于風(fēng)電場集電線的反時(shí)限電流保護(hù)新方法。以直驅(qū)風(fēng)電場為對象,分析得出了傳統(tǒng)三段式電流保護(hù)不適應(yīng)于風(fēng)電場集電線保護(hù)的結(jié)論,并且給出了新方法的整定原則,即根據(jù)熔斷器下游經(jīng)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(guān)系得到集電線反時(shí)限電流保護(hù)的理論曲線,最后借助EMTP-PSCAD軟件平臺(tái)搭建直驅(qū)風(fēng)電場模型對理論分析進(jìn)行了驗(yàn)證。仿真結(jié)果表明,對于風(fēng)電場集電線保護(hù),反時(shí)限電流保護(hù)新方法由于采用了連續(xù)的電流保護(hù)曲線,能夠很好地與熔斷器保護(hù)相配合,克服了傳統(tǒng)三段式電流保護(hù)范圍小、易造成保護(hù)越級(jí)跳閘、風(fēng)機(jī)脫網(wǎng)等缺點(diǎn),而且有很強(qiáng)的抗過渡電阻能力,在不同的故障條件下能快速可靠地動(dòng)作,兼顧了繼電保護(hù)選擇性和速動(dòng)性的要求,因此具有一定的工程實(shí)用價(jià)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(xué)電氣工程學(xué)院;廣州供電局電力調(diào)度控制中心;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃資助項(xiàng)目(2012CB215105)
【分類號(hào)】：TM614;TM77

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本文編號(hào)：2340014