本文選題：電力系統(tǒng)　切入點(diǎn)：輸電斷面　出處：《華中科技大學(xué)》2014年博士論文

【摘要】：保障電網(wǎng)安全高效運(yùn)行是現(xiàn)代電力系統(tǒng)發(fā)展的主要目標(biāo)之一。近年來(lái),高性能計(jì)算機(jī)技術(shù)已能實(shí)現(xiàn)上萬(wàn)節(jié)點(diǎn)規(guī)模的大電網(wǎng)分鐘級(jí)數(shù)據(jù)分析,監(jiān)控與數(shù)據(jù)采集系統(tǒng)／能量管理系統(tǒng)(SCAD A/EMS)和廣域量測(cè)系統(tǒng)(WAMS)可為電網(wǎng)控制中心提供多時(shí)間尺度的信息源,這些都為跨大區(qū)電網(wǎng)的在線評(píng)估提供了可能。本文以多信息源為基礎(chǔ),以電力系統(tǒng)輸電斷面及故障評(píng)估關(guān)鍵技術(shù)為研究目標(biāo),取得的主要成果如下： 在研究了現(xiàn)有輸電斷面研究在應(yīng)用層面上的局限性的基礎(chǔ)上,提出了兩種新的輸電斷面快速識(shí)別方法。通過(guò)分析支路開(kāi)斷下的潮流轉(zhuǎn)移特性,結(jié)合圖論割點(diǎn)與塊的性質(zhì),在總結(jié)歸納潮流轉(zhuǎn)移斷面圖論特征的基礎(chǔ)上,提出了基于割點(diǎn)與路徑搜索的輸電斷面識(shí)別方法。此外,利用電氣距離選取了系統(tǒng)區(qū)域聯(lián)絡(luò)線,進(jìn)而通過(guò)聯(lián)絡(luò)線節(jié)點(diǎn)進(jìn)行系統(tǒng)分區(qū),最終根據(jù)區(qū)域間的連接割集及潮流一致性特征提出了基于輸電通道潮流一致特征的輸電斷面識(shí)別方法。通過(guò)對(duì)這兩種輸電斷面識(shí)別方法的研究,建立了輸電斷面的多角度分析體系。 針對(duì)系統(tǒng)薄弱斷面快速定量評(píng)價(jià)還存在的若干問(wèn)題,提出了一種基于電壓崩潰指數(shù)的極限傳輸容量計(jì)算模型和實(shí)用化算法。該方法與傳統(tǒng)連續(xù)性方法相比具有如下四個(gè)特點(diǎn)：以原始牛頓法為潮流計(jì)算核心,不會(huì)出現(xiàn)連續(xù)潮流擴(kuò)展雅可比矩陣奇異的現(xiàn)象；根據(jù)雅可比矩陣信息計(jì)算相應(yīng)的電壓崩潰指數(shù),該參數(shù)可以引導(dǎo)整個(gè)狀態(tài)推演過(guò)程,將系統(tǒng)負(fù)荷(或發(fā)電)狀態(tài)準(zhǔn)確定位至功率極限點(diǎn)；利用雅可比矩陣信息自動(dòng)選取合適的狀態(tài)推演步長(zhǎng),確保全網(wǎng)負(fù)荷(或發(fā)電)變化能夠準(zhǔn)確地向系統(tǒng)臨界點(diǎn)逼近；整個(gè)推演過(guò)程以雅可比矩陣為計(jì)算核心,不需要每步狀態(tài)推演都有完整的牛頓迭代過(guò)程,從而使計(jì)算速度大幅提升。 由于傳統(tǒng)常規(guī)潮流計(jì)算方法計(jì)算過(guò)程耗時(shí)較大,難以應(yīng)用于極限傳輸容量及薄弱斷面的快速評(píng)估這一難題,提出了一種基于非迭代潮流計(jì)算的極限傳輸容量計(jì)算模型和實(shí)用化算法。該方法把Taylor級(jí)數(shù)引入到電力系統(tǒng)潮流計(jì)算當(dāng)中,它能夠?qū)崿F(xiàn)系統(tǒng)極限傳輸容量快速、實(shí)時(shí)求解的目標(biāo)。 傳統(tǒng)故障定位算法都基于理想化的測(cè)量信息條件,這使得其在實(shí)際電網(wǎng)的應(yīng)用中面臨著眾多問(wèn)題。本文提出了基于故障可觀性的輸電線路故障定位方法,它提供了一種在電網(wǎng)在信息不全條件下的故障定位方案。該方法采用分布參數(shù)輸電線路模型,可以更準(zhǔn)確地考慮分布電容電流對(duì)故障定位精度的影響；算法性能優(yōu)異,且不受故障初始相位角、負(fù)荷及故障路徑阻抗的影響,僅需要相量測(cè)量單元(PMU)的暫態(tài)數(shù)據(jù)信號(hào),無(wú)需系統(tǒng)阻抗等其它信息,算法沒(méi)有迭代過(guò)程,計(jì)算速度快。 考慮到傳統(tǒng)信號(hào)分析方法在處理電力系統(tǒng)故障暫態(tài)信號(hào)過(guò)程中誤差較大的問(wèn)題,本文提出了一種基于快速經(jīng)驗(yàn)?zāi)Ｊ椒纸?EMD)濾波的自適應(yīng)相量評(píng)估算法,該算法可以自適應(yīng)地濾除電力系統(tǒng)故障信號(hào)中的衰減直流分量。為了滿足實(shí)時(shí)計(jì)算的要求,本文在篩選過(guò)程、最優(yōu)包絡(luò)擬合及數(shù)據(jù)窗選擇等方面對(duì)EMD算法做了重要改進(jìn)。
[Abstract]:Ensure safe and efficient operation of power grids is one of the main objectives of the development of modern power system. In recent years, the high performance computer technology has been able to achieve the scale of tens of thousands of nodes power minute level data analysis, monitoring and data acquisition system and energy management system (SCAD A/EMS) and wide area measurement system (WAMS) can provide multi time scale power grid the control center of the information source, which provides the possibility for online assessment of inter regional power grid. Based on the multi information source, with the key technology of power system transmission section and fault evaluation as the research object, the main achievements are as follows:
In the study of the existing research limitations in the transmission section based on application level on the proposed two new fast recognition method of transmission section. Through the analysis of branch breaking under flow transfer characteristics, combined with the properties of graph cut point and block, based on summing up the characteristics of power flow transfer section graph theory, put forward the recognition method of transmission section cut point and based on the path search. In addition, the use of electrical distance system regional contact line, and then through the contact line system partition node, according to the final cut set and connected trend consistent characteristics between regions proposed recognition method of transmission channel transmission section based on the characteristics of the trend consistent through the research on this. Two kinds of identification methods of transmission section, a transmission section of the multi angle analysis system.
In order to solve the problems of rapid quantitative evaluation system has weak cross section, presents a calculation model and method to limit the transmission capacity of voltage collapse based on the index. Compared with the traditional continuous method has the following four characteristics: the original Newton method for power flow calculation of the core, not a continuous trend of extended Jacobi matrix is singular according to the information phenomenon; Jacobi matrix calculation of voltage collapse index corresponding, the parameter can guide the state inference process, the system load (or power) state of accurate positioning to the power limit point; using the Jacobi matrix information automatically selects the appropriate state inference step, ensure that the entire network load (or power) can accurately approximate the changes to the system critical point; the deduction process using the Jacobi matrix as the computing core, does not need each state has complete deduction of Newton iteration Process, so that the speed of calculation is greatly improved.
The calculation method of conventional power flow calculation process is time-consuming, the problem of rapid assessment is difficult to be applied to limit the transmission capacity and weak cross section, a method is proposed for calculating the non iterative power flow based on the limit of transmission capacity calculation model and practical algorithm. The method of the Taylor series was introduced into the power flow calculation of power system, it can realize the system the limit of transmission capacity fast, real time solution.
The traditional fault location algorithms are based on the measurement information of idealized conditions, which makes it faces many problems in the practical application of power grid is put forward in this paper. Based on the fault of transmission line fault location method is considerable, it provides a grid in the incomplete information under the condition of fault location scheme. This method adopts distributed parameter the transmission line model can be more accurate to consider the influence of the distributed capacitance current on the fault location accuracy; algorithm performance is excellent, and is not affected by the fault initial phase angle, impact load and fault path impedance, only phase measuring unit (PMU) of the transient data signal, without system impedance and other information, no algorithm the iterative process, fast calculation speed.
Considering the traditional signal analysis of the large errors in the processing of fault transient signals in power system process, this paper presents a fast empirical mode decomposition based on adaptive filtering (EMD) phase estimation algorithm, this algorithm can adaptively filter the fault signals in power system the decaying DC component. In order to meet the real-time computing requirements. In the screening process, optimal envelope fitting and data window made important improvements to the EMD algorithm.

【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM732

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王成山,魏煒;一種改進(jìn)的步長(zhǎng)控制連續(xù)性潮流計(jì)算方法[J];電工技術(shù)學(xué)報(bào);2004年02期

2 吳杰康;周舉;吳強(qiáng);梁纓;陳國(guó)通;;基于小干擾穩(wěn)定約束可用傳輸容量的計(jì)算[J];電工技術(shù)學(xué)報(bào);2006年09期

3 王增平;李剛;任建文;;基于前K最短路徑的輸電斷面搜索新算法[J];電工技術(shù)學(xué)報(bào);2012年04期

4 江偉,王成山;電力系統(tǒng)輸電能力研究中PV曲線的求取[J];電力系統(tǒng)自動(dòng)化;2001年02期

5 甘德強(qiáng),胡江溢,韓禎祥;2003年國(guó)際若干停電事故思考[J];電力系統(tǒng)自動(dòng)化;2004年03期

6 趙晉泉,張伯明;連續(xù)潮流及其在電力系統(tǒng)靜態(tài)穩(wěn)定分析中的應(yīng)用[J];電力系統(tǒng)自動(dòng)化;2005年11期

7 張景超,張承學(xué),吳方R，

本文編號(hào)：1683616