本文選題：AVC + 電壓無功控制��； 參考：《華中科技大學(xué)》2016年碩士論文

【摘要】：自動電壓控制(AVC)是一個重要的電壓無功調(diào)控手段,不僅提升了系統(tǒng)的電壓電平,并提升了系統(tǒng)的經(jīng)濟效率。但是由于電壓、無功自身的非線性特征,增加了其實現(xiàn)的繁雜性。江西電網(wǎng)地調(diào)110kV及以上變電站大部分接入AVC系統(tǒng),接入率是94%,變電站閉環(huán)運行比例相對低一點,閉環(huán)率為85%,接入率和閉環(huán)率良好。然而,通過對江西省各地市電網(wǎng)AVC系統(tǒng)及調(diào)壓裝置的調(diào)研,發(fā)現(xiàn)其AVC系統(tǒng)調(diào)壓裝置動作頻繁,遠遠超過了國家標準規(guī)定的次數(shù)。這不僅不利于電網(wǎng)智能化水平的提高,還增加了運行人員的工作強度。本文首先分析了變電站電壓無功控制的理論基礎(chǔ),然后進一步對比分析了AVC系統(tǒng)的九區(qū)圖控制策略和十七區(qū)圖控制策略,指出了九區(qū)圖控制策略的不足以及十七區(qū)圖控制策略的改進控制效果,為后續(xù)的分析和建模奠定根基。接著通過對江西省贛州公司、南昌公司和撫州公司2015年5月份所有調(diào)壓設(shè)備每天動作次數(shù)進行統(tǒng)計,獲得所有電容器和主變分接頭動作頻繁率及當(dāng)月一天最大動作次數(shù),從而指出江西省地調(diào)AVC系統(tǒng)調(diào)壓裝置動作頻繁。然后重點針對AVC系統(tǒng)調(diào)壓裝置頻繁動作的實際情況,分析了造成這種現(xiàn)狀的四個主要原因,包括控制方式問題、運行定值范圍問題、裝置問題和運維管理問題。為了解決江西省地調(diào)AVC系統(tǒng)調(diào)壓裝置動作頻繁的問題,本文在MATLAB上,利用模糊邏輯工具箱實現(xiàn)了江西省撫州市黃州變的AVC控制系統(tǒng)調(diào)壓裝置的仿真建模,并和實際運行情況進行了對比,檢驗了模型的正確性。最后,針對造成江西省地調(diào)AVC系統(tǒng)調(diào)壓裝置動作頻繁的原因,本文提出了相應(yīng)的對策,并在仿真模型上驗證了提出的對策的效果。
[Abstract]:Automatic voltage control (AVC) is an important means of voltage and reactive power regulation, which not only improves the voltage level of the system, but also improves the economic efficiency of the system. However, because of the voltage and the nonlinear characteristics of reactive power itself, the complexity of its realization is increased. Most of the substations of 110kV and above in Jiangxi power network are connected to AVC system, the access rate is 94, the closed loop operation ratio of substation is relatively low, the closed loop rate is 85, and the access rate and closed loop rate are good. However, through the investigation of the AVC system and the voltage regulating device in Jiangxi power grid, it is found that the voltage regulating device of the AVC system moves frequently, which far exceeds the number of times stipulated by the national standard. This is not only unfavorable to the improvement of the intelligent level of the power grid, but also increases the working intensity of the operators. In this paper, the theoretical basis of voltage and reactive power control in substation is analyzed firstly, and then the control strategy of nine-zone diagram and 17-zone diagram of AVC system are compared and analyzed. This paper points out the deficiency of the control strategy of the nine-area graph and the improved control effect of the control strategy of the 17-area graph, which lays the foundation for the subsequent analysis and modeling. Then through the statistics of the daily action times of all the voltage regulating equipments in Ganzhou Company, Nanchang Company and Fuzhou Company of Jiangxi Province in May 2015, the frequency of action frequency of all capacitors and main transformer joints and the maximum number of actions per day of that month were obtained. It is pointed out that the voltage regulating device of AVC system in Jiangxi Province is frequently operated. Then, according to the actual situation of the frequent operation of the voltage regulator in AVC system, four main reasons are analyzed, including the control mode problem, the operation fixed range problem, the device problem and the operation and maintenance management problem. In order to solve the problem of the frequent operation of the voltage regulating device of the ground AVC system in Jiangxi Province, the simulation modeling of the voltage regulating device of the AVC control system of Huangzhou transformer in Fuzhou, Jiangxi Province, is realized by using the fuzzy logic toolbox on the MATLAB in this paper. The correctness of the model is verified by comparing it with the actual operation. Finally, in view of the causes of the frequent operation of the AVC system in Jiangxi Province, this paper puts forward the corresponding countermeasures, and verifies the effectiveness of the proposed countermeasures on the simulation model.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TM63;TM761.12

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本文編號：1924612