本文選題：病態(tài)潮流 + 快速分解法　； 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：潮流計(jì)算是電力系統(tǒng)分析中的最基本、最核心的計(jì)算,是電力系統(tǒng)穩(wěn)態(tài)分析和靜態(tài)分析、短路計(jì)算的基礎(chǔ)。在實(shí)際電力系統(tǒng)中,電網(wǎng)趨于大規(guī)模并網(wǎng),特別是局部小電網(wǎng)的并入,環(huán)境因素限制使得輸電走廊受限,電網(wǎng)復(fù)雜性增加,病態(tài)網(wǎng)絡(luò)現(xiàn)象隨之增加,含小阻抗支路系統(tǒng)的病態(tài)潮流普遍存在于實(shí)際電網(wǎng)中。目前,使用最廣泛的潮流算法是牛頓法和快速分解法,快速分解法對(duì)比牛頓法潮流計(jì)算具有計(jì)算速度快,運(yùn)行內(nèi)存小的特點(diǎn)。對(duì)于含小阻抗支路系統(tǒng)的病態(tài)潮流計(jì)算,當(dāng)小阻抗支路電抗遠(yuǎn)大于電阻xr時(shí),快速分解法潮流計(jì)算本身無(wú)病態(tài),當(dāng)小阻抗支路電抗與電阻相差不大或者xr時(shí),快速分解法潮流計(jì)算收斂性變差,甚至不收斂。本文根據(jù)快速分解法自身特點(diǎn),提出兩種算法對(duì)快速分解法進(jìn)行改進(jìn),使其處理各種類型的小阻抗支路病態(tài)網(wǎng)絡(luò)時(shí)均具有較好的收斂性。第1種改進(jìn)算法是以修正系數(shù)修正小阻抗支路的電抗值為基礎(chǔ),提出了修正系數(shù)的經(jīng)驗(yàn)計(jì)算公式,使其處理含各種類型小阻抗支路病態(tài)網(wǎng)絡(luò)時(shí)均具有較好的收斂性。第2種改進(jìn)算法是提出利用串聯(lián)補(bǔ)償法改變?cè)娍古c電阻相差不大或者xr小阻抗支路的結(jié)構(gòu),新增加虛擬節(jié)點(diǎn),使原電抗與電阻相差不大或者xr的小阻抗支路變?yōu)閤r的小阻抗支路和正常支路相結(jié)合的結(jié)構(gòu),徹底消除各種類型小阻抗支路對(duì)快速分解法潮流計(jì)算收斂性的影響,收斂性與正常電網(wǎng)無(wú)差異。通過(guò)IEEE14、IEEE30、東北實(shí)際電網(wǎng)445節(jié)點(diǎn)系統(tǒng)算例分析論證,兩種改進(jìn)算法處理含各種類型小阻抗支路系統(tǒng)時(shí),均具有較好的收斂性。經(jīng)串聯(lián)補(bǔ)償法改進(jìn)的快速分解法潮流算法具有重要的工程實(shí)用價(jià)值。
[Abstract]:Power flow calculation is the most basic and core calculation in power system analysis. It is the basis of power system steady-state analysis, static analysis and short-circuit calculation. In the actual power system, the power network tends to be connected on a large scale, especially the local small power grid, and the environmental factors restrict the transmission corridor, increase the complexity of the power network, and increase the phenomenon of pathological network. The sick power flow with small impedance branch system exists in real power system. At present, the most widely used power flow algorithms are Newton method and fast decomposition method. Compared with Newton method, the fast decomposition method has the characteristics of fast calculation speed and small running memory. For the ill-conditioned power flow calculation of the system with small impedance branch, when the reactance of small impedance branch is far greater than the resistance XR, the fast decomposition power flow calculation itself is not sick, and when the small impedance branch reactance and resistance are not different or XR, The convergence of power flow calculation by fast decomposition method is poor or even does not converge. According to the characteristics of the fast decomposition method, this paper proposes two algorithms to improve the fast decomposition method, so that it has good convergence in dealing with various types of ill-conditioned networks with small impedance branches. The first improved algorithm is based on the modified coefficient to modify the reactance of the small impedance branch. The empirical calculation formula of the modified coefficient is presented, which makes it have better convergence in dealing with the pathological network with various types of small impedance branch. The second improved algorithm is to use the series compensation method to change the structure of the original reactance with little difference between the resistance and the resistance or the XR small impedance branch, and to add the virtual node. The small impedance branch of XR is changed into the structure of combining the small impedance branch of XR with the normal branch, and the influence of various types of small impedance branch on the convergence of power flow calculation by fast decomposition method is completely eliminated, so that the difference between the original reactance and the resistance is not different or the small impedance branch of XR becomes the structure of combining the small impedance branch with normal branch. There is no difference between convergence and normal power grid. Through the example of IEEE 14 IEEE30 and 445 node system of Northeast Power Network, it is proved that the two improved algorithms have good convergence when dealing with various types of small impedance branch systems. The power flow algorithm of fast decomposition method improved by series compensation method has important practical value in engineering.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM744

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