本文選題：矢量匹配　切入點(diǎn)：遺傳算法　出處：《天津大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：當(dāng)今電力系統(tǒng)的運(yùn)行中大多數(shù)事故都是由操作過電壓引起的,為了仔細(xì)分析研究過電壓過程,避免過電壓現(xiàn)象產(chǎn)生的危害,建立精確的頻變輸電線路電磁暫態(tài)模型極其重要。本文詳細(xì)地介紹了頻變輸電線路暫態(tài)模型的建立過程,表明了建模關(guān)鍵在于對輸電線特性導(dǎo)納和傳輸函數(shù)的有理近似的精確度上。目前應(yīng)用矢量匹配法對兩者進(jìn)行迭代匹配所得結(jié)果較之前提出的方法更為精確。但該方法的缺點(diǎn)為匹配結(jié)果受隨機(jī)初始極點(diǎn)的影響較大。如果初始迭代極點(diǎn)選擇不當(dāng),將會(huì)影響擬合結(jié)果的精確度并且嚴(yán)重影響該方法的收斂速度。為了避免矢量匹配法建立的頻變輸電線暫態(tài)模型易受初始迭代極點(diǎn)的影響,論文提出了一種將矢量匹配法與遺傳算法相結(jié)合的頻變輸電線等值電路建模方法。借鑒生物界進(jìn)化理論,利用遺傳算法的全局尋優(yōu)能力搜索全局最優(yōu)極點(diǎn)。通過構(gòu)造迭代極點(diǎn)的適應(yīng)度函數(shù),對矢量匹配過程中出現(xiàn)的迭代極點(diǎn)群體實(shí)施遺傳操作,力求快速獲取具有全局最優(yōu)的特性導(dǎo)納、傳輸函數(shù)的近似有理式。同時(shí),為保證近似有理式的穩(wěn)定性,采用線性約束最小二乘法實(shí)施參數(shù)擬合。并將該方法實(shí)現(xiàn)于仿真平臺(tái)上,經(jīng)過實(shí)踐比較,該方法構(gòu)建的頻變輸電線暫態(tài)模型有較高的仿真精度,并且將遺傳算法和矢量匹配法相結(jié)合的這種尋優(yōu)過程比單純用遺傳算法尋優(yōu)收斂速度快得多,證實(shí)了該模型的實(shí)用性。
[Abstract]:Nowadays, most accidents in power system are caused by operating overvoltage. In order to study overvoltage process carefully and avoid the harm caused by overvoltage phenomenon, It is very important to establish an accurate electromagnetic transient model of frequency transformer transmission line. This paper introduces in detail the process of establishing the transient model of frequency transformer transmission line. It is shown that the key to modeling lies in the accuracy of rational approximation of transmission line characteristic admittance and transmission function. The results obtained by using vector matching method are more accurate than those of the previous method. The disadvantage of the method is that the matching results are greatly influenced by the random initial poles. The accuracy of the fitting results will be affected and the convergence rate of the method will be seriously affected. In order to avoid the transient model of frequency transformer transmission line established by vector matching method is vulnerable to the influence of initial iterative poles. In this paper, a method for modeling equivalent circuit of frequency transformer transmission line is proposed, which combines vector matching method with genetic algorithm. The global optimal pole is searched by using the global optimization ability of genetic algorithm. By constructing the fitness function of the iterative pole, the genetic operation of the iterative pole population in the process of vector matching is carried out. In order to ensure the stability of the approximate rational formula, the linear constrained least square method is used to implement parameter fitting, and the method is implemented on the simulation platform. Through practical comparison, the transient model of frequency transformer transmission line constructed by this method has high simulation accuracy, and the optimization process which combines genetic algorithm and vector matching method is much faster than that using genetic algorithm alone. The practicability of the model is verified.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM75;TM743

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 申文;劉亞東;盛戈v，

本文編號(hào)：1580648