本文選題：電力系統(tǒng) + 半波長輸電　； 參考：《哈爾濱工業(yè)大學》2017年碩士論文

【摘要】：當前,我國西部能源中心與東部負荷中心之間的距離可能達到甚至超過3000km,國際上遠距離輸電的計劃也越來越多。遠距離、大容量的輸電技術(shù)亟待研究。半波長交流輸電技術(shù)作為一種超遠距離輸電模式,對其研究有著重要的意義�；陂L輸電線路模型,詳細分析了均勻和非均勻輸電線路的輸電特性。在不同功率下,給出了均勻輸電線路沿線電壓電流幅值極值出現(xiàn)的位置及大小的數(shù)學表達式。對于非均勻輸電線路,提出了其滿足半波長輸電特性的一個充分條件。為分析半波長輸電系統(tǒng)的暫態(tài)特性,基于半波長的集總參數(shù)模型,利用分裂法理論,建立了用于數(shù)值仿真的半波長輸電線路離散等值動態(tài)模型,該模型具有結(jié)構(gòu)簡單、數(shù)值仿真穩(wěn)定性好、精度高的特點。利用該模型,對半波長輸電系統(tǒng)的空載合閘、甩負荷、單相接地故障進行了仿真。當均勻輸電線路不足半波長時,詳細地研究了其調(diào)諧網(wǎng)絡(luò)的類型及其參數(shù)確定方法�；诰鶆騻鬏斁�的傳輸參數(shù)矩陣,給出了T型、π型和電容型調(diào)諧網(wǎng)絡(luò)的參數(shù)確定方法。在穩(wěn)態(tài)情況下,利用電容型調(diào)諧網(wǎng)絡(luò)補償線路長度時,減小了等效特征阻抗、增大了等效自然功率。在穩(wěn)態(tài)情況下,利用T型或π型調(diào)諧網(wǎng)絡(luò)補償線路長度時,其等效特征阻抗和等效自然功率均不變。詳細分析了電容型調(diào)諧網(wǎng)絡(luò)個數(shù)及T型和π型調(diào)諧網(wǎng)絡(luò)安裝位置對首末端電壓比、線路損耗和沿線電壓分布的影響。對于非均勻的傳輸線,給出了其調(diào)諧網(wǎng)絡(luò)結(jié)構(gòu),并基于傳輸線的傳輸參數(shù)矩陣,給出了其參數(shù)確定方法。對于含有調(diào)諧網(wǎng)絡(luò)的半波長輸電線路,仿真分析了含有π型和電容型調(diào)諧網(wǎng)絡(luò)的暫態(tài)特性,含有電容型調(diào)諧網(wǎng)絡(luò)的系統(tǒng)暫態(tài)過電壓要小于含有π型調(diào)諧網(wǎng)絡(luò)的系統(tǒng),分析了電容型調(diào)諧網(wǎng)絡(luò)個數(shù)、首端母線處故障電流和線路長度對暫態(tài)過程的影響。對于π型和電容型調(diào)諧網(wǎng)絡(luò)內(nèi)部電容兩端暫態(tài)電壓過高的問題,給出了降低方法。經(jīng)仿真分析,提出的π型和電容型調(diào)諧網(wǎng)絡(luò)中性點經(jīng)電阻接地的方法,可有效抑制其電容兩端的暫態(tài)過電壓。
[Abstract]:At present, the distance between the western energy center and the eastern load center may reach or even exceed the 3000km. There are more and more plans for the long distance transmission in the world. The long distance, large capacity transmission technology needs to be studied urgently. Half wavelength AC transmission technology is of great significance to its research as a super distance transmission mode. In the long transmission line model, the transmission characteristics of uniform and non-uniform transmission lines are analyzed in detail. At different power, the mathematical expressions of the position and size of the extreme value of the voltage and current amplitude along the uniform transmission line are given. A sufficient condition for the non uniform transmission lines to meet the half wavelength transmission characteristics is proposed. The transient characteristics of the half wavelength transmission system are analyzed. Based on the half wavelength lumped parameter model, the discrete equivalent dynamic model for the semi wavelength transmission line is established by using the split method theory. The model has a simple structure, good numerical simulation stability and high precision. Using this model, the space load of half wavelength transmission system is unloaded. Sluice, load rejection and single-phase grounding fault are simulated. When a uniform transmission line is less than half wavelength, the type of tuning network and its parameter determination method are studied in detail. Based on the transmission parameter matrix of uniform transmission line, the parameter determination method of T, PI and capacitive type tuning networks is given. When the tuning network compensates the length of the line, the equivalent characteristic impedance is reduced and the equivalent natural power is increased. In the steady state, the equivalent characteristic impedance and the equivalent natural power are invariable when the T type or PI tuning network compensates the line length. The number of capacitance tuned network collaterals and the installation position of the T and PI tuning networks are analyzed in detail. The influence of the first terminal voltage ratio, the line loss and the distribution of the voltage along the line. For the non-uniform transmission line, the tuning network structure is given, and the parameter determination method is given based on the transmission line transmission parameter matrix. For the half wavelength transmission line containing the tunable network, the pion type and the capacitive tuning network are analyzed. The transient overvoltage of a system containing a capacitive tuning network is less than a system containing a pion tuned network. The effects of the number of capacitance tuning networks, the fault current and the length of the first bus line on the transient process are analyzed. The problem of the transient overvoltage at both ends of the internal capacitance of the pion and capacitive tunable network is given. The method of reducing the transient overvoltage at both ends of the capacitor can be effectively suppressed by the simulation analysis.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM75

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本文編號：2023373