本文選題：交直流混聯(lián)電力系統(tǒng)　切入點：靜態(tài)電壓穩(wěn)定性　出處：《北京交通大學(xué)》2014年碩士論文

【摘要】：近年來,我國特高壓直流電網(wǎng)建設(shè)發(fā)展迅速,由于其輸送容量巨大,需要在系統(tǒng)安全運(yùn)行和穩(wěn)定控制中高度重視,進(jìn)行充分的事故預(yù)想和對策分析,這給電網(wǎng)運(yùn)行管理和生產(chǎn)帶來了新的挑戰(zhàn)和研究課題。隨著交直流混聯(lián)系統(tǒng)的不斷發(fā)展,如何保證系統(tǒng)的安全穩(wěn)定運(yùn)行引起國內(nèi)外學(xué)者的廣泛關(guān)注,FACTS為實現(xiàn)這一目標(biāo)提供了新的控制技術(shù)和有效手段。對于一個大型電網(wǎng),FACTS的應(yīng)用效果很大程度上取決于其在電網(wǎng)中配置是否合理。針對電網(wǎng)的穩(wěn)定運(yùn)行需求,如何合理地選擇FACTS在電網(wǎng)中的接入地點、類型及容量是一個亟待解決的問題。 本論文依托河南電網(wǎng)公司橫向課題“大型交直流混聯(lián)受端系統(tǒng)靜態(tài)電壓穩(wěn)定特性分析與對策研究”,以哈密—鄭州±800kV特高壓直流及其投運(yùn)后的河南電網(wǎng)為研究對象,對該交直流混聯(lián)系統(tǒng)進(jìn)行了靜態(tài)電壓穩(wěn)定性分析及FACTS優(yōu)化配置研究,主要研究內(nèi)容如下： (1)定義了用于評價交直流混聯(lián)系統(tǒng)靜態(tài)電壓穩(wěn)定水平的系統(tǒng)負(fù)荷能力指標(biāo)。從理論上分析了不同的直流系統(tǒng)控制方式對受端電網(wǎng)靜態(tài)電壓穩(wěn)定性產(chǎn)生的影響。將哈鄭直流投運(yùn)后河南電網(wǎng)的運(yùn)行方式進(jìn)行了細(xì)分和計算,對直流系統(tǒng)控制方式進(jìn)行了優(yōu)化分析,并得出了不同的直流傳輸功率下系統(tǒng)最佳運(yùn)行方式。 (2)指出FACTS理想的接入地點應(yīng)該是一些較優(yōu)安裝地點(包括母線和線路)的集合,選用在我國實際電網(wǎng)中已獲得廣泛應(yīng)用的SVC與TCSC,以尋找電網(wǎng)中的薄弱母線和關(guān)鍵線路為目標(biāo),提出分別采用模態(tài)分析法、靈敏度分析法求取母線參與因子、線路靈敏度系數(shù),對電網(wǎng)中母線、線路安裝FACTS的優(yōu)先次序進(jìn)行排序,作為FACTS接入地點選擇的依據(jù)。 (3)建立了系統(tǒng)靜態(tài)電壓穩(wěn)定性-]ACTS投資費用多目標(biāo)優(yōu)化的數(shù)學(xué)模型,為了求解系統(tǒng)靜態(tài)電壓穩(wěn)定水平足夠高且投資費用盡量低的多目標(biāo)優(yōu)化問題,提出混沌自適應(yīng)進(jìn)化算法,該算法在NSGA-Ⅱ算法的基礎(chǔ)上對初代種群的生成、遺傳算子等關(guān)鍵技術(shù)進(jìn)行了改進(jìn)。 (4)以哈鄭直流投運(yùn)后的河南電網(wǎng)為研究對象,利用提出的FACTS接入地點選擇方法與混沌自適應(yīng)進(jìn)化算法,對FACTS進(jìn)行了優(yōu)化配置,并給出了不同直流傳輸功率下推薦的FACTS配置方案。對SVC與TCSC接入地點、相關(guān)容量與參數(shù)的設(shè)置等進(jìn)行了排序,擬定FACTS投資建設(shè)順序供決策人員參考。
[Abstract]:In recent years, the construction of UHV DC power network in China has developed rapidly. Due to its huge transportation capacity, it needs to attach great importance to the safe operation and stability control of the system, and make full accident prediction and countermeasure analysis.This brings new challenges and research topics to grid operation management and production.With the continuous development of AC / DC hybrid systems, how to ensure the safe and stable operation of the system has attracted wide attention of scholars at home and abroad. Facts provides a new control technology and effective means to achieve this goal.The application effect of facts to a large power grid depends to a great extent on its reasonable configuration in the power network.In view of the stable operation demand of the power network, how to select the access location, type and capacity of FACTS in the power network is an urgent problem to be solved.This paper relies on the horizontal project of Henan Power Grid Company, "static voltage stability characteristic analysis and countermeasure study of large AC / DC hybrid terminal system", taking Hami Zhengzhou 鹵800kV UHV DC and the Henan power grid after commissioning as the research object.The static voltage stability analysis and FACTS optimal configuration of the AC / DC hybrid system are studied. The main contents are as follows:The system load capacity index is defined to evaluate the static voltage stability level of AC / DC hybrid system.The influence of different DC system control methods on the static voltage stability of the terminal power network is analyzed theoretically.The operation mode of Henan power network is subdivided and calculated, the control mode of DC system is optimized and analyzed, and the optimal operation mode of the system under different DC transmission power is obtained.It is pointed out that the ideal access location for FACTS should be a collection of some better installation sites (including busbar and line). The SVC and TCS, which have been widely used in the actual power grid in China, are chosen to find the weak busbar and key line in the power network.Modal analysis method and sensitivity analysis method are used to calculate the bus participation factor and line sensitivity coefficient respectively. The priority order of bus and line FACTS installation in power network is put forward as the basis for the selection of FACTS access location.In order to solve the multi-objective optimization problem with high static voltage stability and low investment cost, a chaotic adaptive evolutionary algorithm is proposed.On the basis of NSGA- 鈪，

本文編號：1706749