【摘要】：隨著科技的迅速發(fā)展,電力系統(tǒng)相應(yīng)發(fā)生許多變化:大容量發(fā)電機(jī)組普遍應(yīng)用,電力系統(tǒng)互聯(lián)、電網(wǎng)電壓等級(jí)升高,負(fù)荷容量相對(duì)集中,直流輸電和新型電力電子控制裝置的應(yīng)用等,但受環(huán)境和建設(shè)成本的限制,電網(wǎng)結(jié)構(gòu)卻相對(duì)薄弱,發(fā)電設(shè)備儲(chǔ)備量較少,系統(tǒng)常運(yùn)行在重負(fù)荷條件下,現(xiàn)代敏感負(fù)荷所占比例越來(lái)越大,這些現(xiàn)狀使得電壓穩(wěn)定問(wèn)題日益突出。本文在“廣東電網(wǎng)動(dòng)態(tài)無(wú)功補(bǔ)償裝置優(yōu)化配置”研究課題上,深入研究暫態(tài)電壓穩(wěn)定及暫態(tài)電壓穩(wěn)定緊急控制措施。暫態(tài)電壓緊急控制是一種事故后控制,當(dāng)電力系統(tǒng)處于緊急狀態(tài)下,通過(guò)采取適當(dāng)?shù)拇胧?使電力系統(tǒng)恢復(fù)到正常狀態(tài)或者暫時(shí)進(jìn)入恢復(fù)狀態(tài)的控制。常見(jiàn)的改善措施分為兩類:一類是安裝以靜止同步補(bǔ)償器為代表的動(dòng)態(tài)無(wú)功補(bǔ)償裝置,另一類是緊急切負(fù)荷控制。針對(duì)兩種措施,分別搭建優(yōu)化模型,考慮電壓穩(wěn)定約束的同時(shí)控制成本最低,接著以電壓暫降概率為改善目標(biāo),協(xié)調(diào)控制無(wú)功補(bǔ)償和緊急切負(fù)荷。本文主要工作如下:首先,本文考慮暫態(tài)電壓穩(wěn)定,提出緊急切負(fù)荷優(yōu)化控制模型。以控制成本為優(yōu)化單目標(biāo)函數(shù)。引入軌跡靈敏度法,將復(fù)雜非線性優(yōu)化控制模型轉(zhuǎn)化為靜態(tài)的線性整數(shù)規(guī)劃模型以簡(jiǎn)化優(yōu)化難度。為了尋找最優(yōu)解,使用啟發(fā)式算法,提出Lsi指標(biāo),通過(guò)該數(shù)值的大小排序判斷各節(jié)點(diǎn)切負(fù)荷的改善程度,從而判斷切負(fù)荷地點(diǎn)和切負(fù)荷容量,通過(guò)實(shí)例仿真表明,該方法簡(jiǎn)化計(jì)算的同時(shí)不存在迭代問(wèn)題。然后,本文提出動(dòng)態(tài)無(wú)功容量?jī)?yōu)化模型。從敏感負(fù)荷角度出發(fā),把電壓暫降指標(biāo)做為電壓改善目標(biāo)。本文基于蒙特卡洛理論搭建故障模型,隨機(jī)生成故障發(fā)生類型和故障發(fā)生時(shí)間,統(tǒng)計(jì)并生成電壓暫降概率表。搭建電壓暫降費(fèi)用模型,同時(shí)計(jì)及系統(tǒng)有功損耗費(fèi)用和STATCOM補(bǔ)償裝置投資費(fèi)用,生成年總支出費(fèi)用建立優(yōu)化模型。通過(guò)曲線擬合方式求取暫降費(fèi)用與容量函數(shù)關(guān)系,方便后續(xù)容量?jī)?yōu)化計(jì)算。通過(guò)實(shí)例仿真,驗(yàn)證方法的正確性和有效性。最后,本文提出緊急電壓協(xié)調(diào)控制策略。以電壓暫降概率指標(biāo)為改善對(duì)象,同時(shí)考慮緊急切負(fù)荷控制和STATCOM動(dòng)態(tài)無(wú)功補(bǔ)償,優(yōu)先進(jìn)行STATCOM無(wú)功補(bǔ)償,如果不滿足要求再考慮緊急切負(fù)荷控制,協(xié)調(diào)配合,最大限度降低電壓暫降發(fā)生概率。通過(guò)實(shí)例仿真驗(yàn)證得出電壓暫降發(fā)生概率大大降低,效果明顯。
[Abstract]:With the rapid development of science and technology, many changes have taken place in the power system: large capacity generating sets are widely used, power systems are connected, the voltage level of the power grid is increased, and the load capacity is relatively concentrated. The application of DC transmission and new power electronic control devices, but limited by the environment and construction cost, the power grid structure is relatively weak, the storage of power generation equipment is less, and the system often runs under heavy load conditions. The proportion of modern sensitive load is increasing, which makes the problem of voltage stability more and more prominent. In this paper, based on the research topic of "optimal configuration of dynamic reactive Power compensation device in Guangdong Power Grid", the transient voltage stability and emergency control measures of transient voltage stability are deeply studied. Transient voltage emergency control is a kind of post-accident control. When the power system is in a state of emergency, appropriate measures are taken to make the power system return to the normal state or temporarily enter the recovery state. The common improvement measures are divided into two categories: one is the installation of dynamic reactive power compensation devices represented by static synchronous compensators, the other is emergency load cutting control. According to the two measures, the optimization model is built respectively, and the control cost is the lowest considering the voltage stability constraint. Then, taking the voltage sag probability as the improvement goal, the reactive power compensation and emergency load shedding are coordinated and controlled. The main work of this paper is as follows: firstly, considering transient voltage stability, an emergency load shedding optimization control model is proposed. Take the control cost as the optimization single objective function. The trajectory sensitivity method is introduced to transform the complex nonlinear optimal control model into a static linear integer programming model to simplify the difficulty of optimization. In order to find the optimal solution, the heuristic algorithm is used to propose the Lsi index, and the improvement degree of load shedding of each node is judged by the order of the numerical value, so as to judge the load shedding place and load cutting capacity. This method simplifies the calculation and does not have the iterative problem at the same time. Then, a dynamic reactive capacity optimization model is proposed. From the point of view of sensitive load, the voltage sag index is taken as the target of voltage improvement. In this paper, based on Monte Carlo theory, the fault model is built, the fault occurrence type and fault occurrence time are randomly generated, and the voltage sag probability table is counted and generated. The voltage sag cost model is built, and the system active power loss cost and the investment cost of STATCOM compensation device are taken into account at the same time, and the annual total expenditure cost is generated to establish the optimization model. The relationship between sag cost and capacity function is obtained by curve fitting, which is convenient for subsequent capacity optimization calculation. The correctness and effectiveness of the method are verified by an example. Finally, an emergency voltage coordinated control strategy is proposed. Taking the probability index of voltage sag as the improvement object, considering the emergency load shedding control and STATCOM dynamic reactive power compensation, priority should be given to STATCOM reactive power compensation, and if the requirements are not met, the emergency load shedding control should be considered and coordinated. Minimize the probability of voltage sag. The simulation results show that the probability of voltage sag is greatly reduced and the effect is obvious.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM712

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王旭冉;郭慶來(lái);孫宏斌;王彬;張明曄;張伯明;;考慮快速動(dòng)態(tài)無(wú)功補(bǔ)償?shù)亩?jí)電壓控制[J];電力系統(tǒng)自動(dòng)化;2015年02期

2 李帥虎;曹一家;劉光曄;;基于阻抗模裕度指標(biāo)的動(dòng)態(tài)無(wú)功補(bǔ)償裝置優(yōu)化配置方法[J];中國(guó)電機(jī)工程學(xué)報(bào);2014年22期

3 王曦冉;章敏捷;鄧敏;喬永亮;胡曉琴;;基于動(dòng)態(tài)安全域的最優(yōu)時(shí)間緊急控制策略算法[J];電力系統(tǒng)保護(hù)與控制;2014年12期

4 李劍輝;曹陽(yáng);辛拓;楊銀國(guó);曹一家;李帥虎;;考慮電壓暫降風(fēng)險(xiǎn)的高壓配網(wǎng)動(dòng)態(tài)無(wú)功容量?jī)?yōu)化配置[J];電力系統(tǒng)保護(hù)與控制;2014年08期

5 王玲;徐柏榆;王奕;李欣然;;東莞地區(qū)負(fù)荷低壓脫扣事故分析[J];廣東電力;2013年02期

6 魏承志;陳晶;涂春鳴;宋偉偉;覃日升;;基于儲(chǔ)能裝置與靜止無(wú)功發(fā)生器協(xié)同控制策略的微網(wǎng)電壓波動(dòng)抑制方法[J];電網(wǎng)技術(shù);2012年11期

7 張志文;胡非;謝洪濤;;基于風(fēng)險(xiǎn)的低壓減載地點(diǎn)選擇方法[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2012年05期

8 袁志昌;夏濤;;低壓減載整定方法綜述[J];電力系統(tǒng)保護(hù)與控制;2012年15期

9 鐘慶;林凌雪;易楊;張堯;武志剛;;電壓暫降評(píng)估指標(biāo)(Ⅰ)——電網(wǎng)薄弱環(huán)節(jié)指標(biāo)[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2012年01期

10 黃弘揚(yáng);楊汾艷;徐政;韓松;;基于改進(jìn)軌跡靈敏度指標(biāo)的動(dòng)態(tài)無(wú)功優(yōu)化配置方法[J];電網(wǎng)技術(shù);2012年02期

，

本文編號(hào)：2493299