基于改進的連續(xù)潮流的靜態(tài)電壓穩(wěn)定分析的研究
本文選題:電壓穩(wěn)定 + 連續(xù)潮流。 參考:《鄭州大學》2014年碩士論文
【摘要】:近些年來,在全球范圍內(nèi)發(fā)生了很多起電力系統(tǒng)的電壓失穩(wěn)事故,這就使靜態(tài)電壓穩(wěn)定成為電力系統(tǒng)穩(wěn)定性研究的重點之一。我國已經(jīng)進入大電網(wǎng)、大機組、高電壓、重負荷、遠距離互聯(lián)化的輸電時代,電力系統(tǒng)必然會比之前面臨更多的電壓失穩(wěn)的影響。因此,正確的對電力系統(tǒng)的安全穩(wěn)定性進行評價,使電力系統(tǒng)具有足夠的功率裕度來防止電壓過低所導致的電壓崩潰事故,這具有非常重要的意義。本文是以連續(xù)潮流為基礎(chǔ),首先對連續(xù)潮流進行了改進,,然后用改進的連續(xù)潮流對電力系統(tǒng)的靜態(tài)電壓穩(wěn)定性進行了分析,結(jié)果顯示改進的連續(xù)潮流有著較好的計算效果。 首先,本文對連續(xù)潮流的算法原理、特點以及一些其他的相關(guān)問題進行論述;同時對連續(xù)潮流在靜態(tài)電壓穩(wěn)定分析中的應(yīng)用進行了分析。 其次,本文提出了改進參數(shù)化的PQ分解的連續(xù)潮流法,在校正過程中,本文提出了一種新的參數(shù)化方法,該方法是以幾何相似性的參數(shù)化方程進行參數(shù)化,然后本文使用PQ分解法求解擴展潮流。在預(yù)測過程中,本文使用拉格朗日二次插值法進行預(yù)測來提高計算效率。和傳統(tǒng)的連續(xù)潮流法相比較,本文所提出的改進參數(shù)化的PQ分解的連續(xù)潮流法的計算時間大幅的減少、計算所占用的內(nèi)存量更少、計算的準確度更高。 最后,本文編寫了改進參數(shù)化的PQ分解的連續(xù)潮流的程序,采用IEEE14、39、57節(jié)點系統(tǒng)的三個算例還有某地區(qū)的一個實際算例對本文的所給出方法進行了驗證,計算結(jié)果證明了本文所提出的算法的快速性、正確性以及有效性。
[Abstract]:In recent years, there have been a lot of power system voltage instability accidents in the world, which makes static voltage stability become one of the key points of power system stability research. China has entered the era of large power grid, large unit, high voltage, heavy load, long distance interconnection, and the power system is bound to face more voltage instability than before. Therefore, it is very important to evaluate the security and stability of power system correctly and make the power system have enough power margin to prevent the voltage collapse caused by too low voltage. Based on the continuous power flow, this paper first improves the continuous power flow, and then analyzes the static voltage stability of the power system by using the improved continuous power flow. The results show that the improved continuous power flow has a good calculation effect. Firstly, the algorithm principle, characteristics and some other related problems of continuous power flow are discussed, and the application of continuous power flow in static voltage stability analysis is analyzed. Secondly, a continuous power flow method with improved parameterized PQ decomposition is proposed. In the process of correction, a new parameterization method is proposed, which is parameterized by parameterized equations with geometric similarity. Then the PQ decomposition method is used to solve the extended power flow. In the process of prediction, Lagrangian quadratic interpolation method is used to improve the computational efficiency. Compared with the traditional continuous power flow method, the computational time of the improved parameterized PQ decomposition continuous power flow method is greatly reduced, the amount of memory consumed by the calculation is less, and the accuracy of the calculation is higher. Finally, the program of continuous power flow with improved parameterized PQ decomposition is compiled. The method is verified by three examples of IEEE 14997 bus system and a practical example in a certain area. The results show that the proposed algorithm is fast, correct and effective.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:TM712
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