【摘要】：農(nóng)村電網(wǎng)功率因數(shù)較低,并隨著近年來大量非線性負(fù)荷的使用,諧波問題越來越嚴(yán)重。本文就農(nóng)村電網(wǎng)無功功率的補(bǔ)償及電壓調(diào)節(jié)、諧波治理展開了分析,并給出了相應(yīng)的解決方法。首先就內(nèi)蒙古包頭市九原地區(qū)的農(nóng)網(wǎng)現(xiàn)狀展開了介紹,其中包括農(nóng)網(wǎng)改造建設(shè)的情況,改造建設(shè)后仍舊存在的一些問題,以及腦包所所管轄下的10kV線路的諧波測試數(shù)據(jù),并對該地區(qū)的諧波進(jìn)行了簡要的分析；針對該地區(qū)線路電壓偏低的問題,給出了所采取的措施,包括采用并聯(lián)電容器進(jìn)行無功補(bǔ)償,提高功率因數(shù)、減小線損以及提高末端電壓。然后就無功補(bǔ)償?shù)脑怼⒆饔靡约盁o功補(bǔ)償?shù)姆诸惡脱a(bǔ)償裝置的配置原則展開了分析和討論,給出了采用并聯(lián)電容器進(jìn)行無功補(bǔ)償時(shí)補(bǔ)償容量的計(jì)算方法,并對無功補(bǔ)償裝置合適的補(bǔ)償點(diǎn)展開了分析,給出了無功補(bǔ)償點(diǎn)確定的相應(yīng)原則。針對農(nóng)網(wǎng)中所存在的諧波問題,在進(jìn)行并聯(lián)電容器中串聯(lián)電抗率的選擇時(shí),給出了相應(yīng)的選擇方法,以及給出了在進(jìn)行不同串抗率的配比時(shí),不同串聯(lián)電抗率組數(shù)的確定方法。最后針對10kV農(nóng)網(wǎng)電壓偏低的問題,介紹了一種較新穎的電壓調(diào)節(jié)方法—晶閘管電壓調(diào)節(jié)器TVR。對TVR的應(yīng)用背景、工作原理以及主電路的選擇進(jìn)行了闡述,對TVR電壓的檢測方法和控制策略進(jìn)行了分析和討論,其中就電壓的檢測給出了新的檢測方法；最后建立了仿真模型進(jìn)行了仿真分析,證明了此種調(diào)節(jié)方法的切實(shí)可行性。最后對TVR調(diào)壓和電容器無功補(bǔ)償調(diào)壓從多個(gè)方面進(jìn)行了對比分析,指出了TVR調(diào)壓相對于電容器的一些優(yōu)勢。
[Abstract]:The power factor of rural power network is low, and with the use of a large number of nonlinear loads in recent years, the harmonic problem is becoming more and more serious. In this paper, the reactive power compensation and voltage regulation of rural power network and harmonic control are analyzed, and the corresponding solutions are given. First of all, the paper introduces the current situation of rural power network in Jiuyuan area of Baotou City, Inner Mongolia, including the situation of rural power network reconstruction and construction, some problems that still exist after the reconstruction construction, and the harmonic testing data of 10kV line under the jurisdiction of Naobao. The harmonics in this area are analyzed briefly, and the measures taken to solve the problem of low line voltage are given, including the use of shunt capacitors for reactive power compensation and the improvement of power factor. Reduce line loss and increase terminal voltage. Then the principle of reactive power compensation, the function, the classification of reactive power compensation and the configuration principle of compensator are analyzed and discussed, and the calculation method of compensation capacity when using shunt capacitor to compensate reactive power is given. The appropriate compensation points of the reactive power compensator are analyzed, and the corresponding principles for determining the reactive power compensation points are given. Aiming at the harmonic problem in rural power network, the selection method of series reactance in parallel capacitor is given, and the method of determining the number of different series reactance ratio in different ratio of series reactance is given. Finally, aiming at the problem of low voltage in 10kV rural network, a novel voltage regulation method-thyristor voltage regulator (TVR.) is introduced. The application background, working principle and selection of main circuit of TVR are expounded. The detection method and control strategy of TVR voltage are analyzed and discussed, and a new detection method for voltage detection is given. Finally, the simulation model is established and the feasibility of this method is proved. Finally, TVR voltage regulation and capacitor reactive power compensation voltage regulation are compared and analyzed from many aspects, and some advantages of TVR voltage regulation over capacitors are pointed out.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761.12
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本文編號：2265110