本文選題：配電網(wǎng) + 逆變型分布式電源　； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：隨著常規(guī)能源的日漸枯竭和環(huán)境問題的日益惡化,利用太陽能、風(fēng)能等可再生能源的逆變型分布式電源(Inverter Interfaced Distributed Generator,IIDG)大規(guī)模接入配電網(wǎng)。逆變型分布式電源的并網(wǎng)徹底改變了配電網(wǎng)原有的單電源輻射狀網(wǎng)絡(luò)結(jié)構(gòu),并導(dǎo)致配電網(wǎng)的潮流分布及故障特性發(fā)生改變,給故障的精確定位帶來了新的挑戰(zhàn)。研究適用于含逆變型分布式電源的配電網(wǎng)故障定位方法對于提高配電網(wǎng)對分布式電源的兼容性及提高配電網(wǎng)的可靠性具有重要意義。本文主要研究內(nèi)容如下:首先,本文研究了含逆變型分布式電源的配電網(wǎng)故障特性。通過將逆變型分布式電源等效為壓控電流源,構(gòu)建了含逆變型分布式電源的配電網(wǎng)故障等效模型,分析了逆變型分布式電源接入容量和接入位置對配電網(wǎng)故障電流的影響。配電網(wǎng)故障特性的改變將使配電網(wǎng)中故障定位所用啟動值難以整定,導(dǎo)致以準確整定值為基礎(chǔ)的傳統(tǒng)故障定位方法無法直接應(yīng)用。其次,研究了基于改進阻抗法的故障定位方法�？紤]到目前中低壓配電網(wǎng)饋線上電壓互感器的覆蓋率較低,同時為了避免對檢測裝置開關(guān)動作值的整定計算,本文以經(jīng)濟且易于實現(xiàn)的阻抗定位法為基礎(chǔ),提出了基于改進阻抗法的配電網(wǎng)故障定位方法。首先,利用過渡電阻純阻性的性質(zhì),構(gòu)建故障定位方程,求解得到可能的故障位置,完成粗略故障定位;然后將可能故障點視為虛擬節(jié)點,重新形成包含虛擬節(jié)點在內(nèi)的系統(tǒng)節(jié)點阻抗矩陣,通過比較變電站出線電壓的計算值與測量值,將最接近實測電壓值的虛擬節(jié)點視為最終故障點。該故障定位方法克服了傳統(tǒng)阻抗法在定位之前易產(chǎn)生偽故障點等缺點。在仿真平臺上驗證了改進阻抗法的有效性,結(jié)果表明當過渡電阻較大及故障點距離變電站出線端較遠時,該方法仍能保持較高的故障定位精度。最后,研究了計及線路集中電容的含逆變型分布式電源的配電網(wǎng)故障定位方法。由于以往的適用于含分布式電源的配電網(wǎng)故障定位方法需布置較多測量點,且未考慮線路對地電容對故障定位精度的影響,本文在改進阻抗法的基礎(chǔ)上,提出了適用于含逆變型分布式電源的配電網(wǎng)故障定位方法,實現(xiàn)了僅利用變電站出線電壓、電流及并網(wǎng)點電壓測量值對配電網(wǎng)故障進行定位。在仿真平臺上對該方法進行驗證,分析結(jié)果可知該方法受過渡電阻及故障位置的影響較小,定位誤差在可接受范圍內(nèi)。
[Abstract]:With the depletion of conventional energy sources and the worsening of environmental problems, Inverter interfaced distributed Generator / IIDG (Inverter Interfaced distributed Generator / IIDG), which uses renewable energy sources such as solar and wind energy, is connected to the distribution network on a large scale. The power flow distribution and fault characteristics of the distribution network have been changed by the grid connection of the inverter distributed generation, which has brought new challenges to the accurate location of the fault. It is of great significance to study the fault location method of distribution network with inverter distributed generation for improving the compatibility of distribution network to distributed generation and improving the reliability of distribution network. The main contents of this paper are as follows: firstly, the fault characteristics of distribution network with inverters are studied. By equivalent inverter distributed power supply to voltage controlled current source, a fault equivalent model of distribution network with inverter distributed power supply is constructed, and the influence of access capacity and location of inverter distributed power supply on fault current of distribution network is analyzed. The change of fault characteristics in distribution network will make it difficult to adjust the starting value of fault location in distribution network, and the traditional fault location method based on accurate setting value can not be directly applied. Secondly, the fault location method based on improved impedance method is studied. Considering that the coverage of voltage transformer on feeder line of medium and low voltage distribution network is low, and in order to avoid the setting calculation of switch action value of detection device, this paper is based on the economical and easy to realize impedance positioning method. A fault location method for distribution network based on improved impedance method is proposed. Firstly, the fault location equation is constructed by using the property of pure resistance of transition resistance, and the possible fault location is solved to complete rough fault location, and then the possible fault point is regarded as a virtual node. The impedance matrix of system nodes including virtual nodes is formed again. By comparing the calculated and measured values of substation outline voltages, the virtual nodes closest to the measured voltage values are regarded as the final fault points. The fault location method overcomes the shortcomings of the traditional impedance method. The effectiveness of the improved impedance method is verified on the simulation platform. The results show that the method can still maintain high fault location accuracy when the transition resistance is large and the fault point is far from the substation outlet. Finally, the fault location method of distribution network with inverter distributed generation is studied. Since the previous fault location methods with distributed power supply need more measuring points, and the influence of line capacitance on fault location accuracy is not considered, the impedance method is improved in this paper. In this paper, a fault location method for distribution network with inverter distributed generation is proposed. The fault location of distribution network is realized only by measuring the output voltage, current and parallel dot voltage of substation. The method is verified on the simulation platform. The analysis results show that the method is less affected by the transition resistance and fault location, and the positioning error is within the acceptable range.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM711

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本文編號：2034745