地區(qū)電網(wǎng)無功電壓問題及其優(yōu)化對策研究
發(fā)布時間：2018-07-27 16:45
【摘要】：電壓質(zhì)量是電力系統(tǒng)電能質(zhì)量中的重要指標之一。在電壓質(zhì)量諸多問題中，電壓偏差對電力系統(tǒng)的危害極為嚴重、廣泛，它不僅會直接影響電氣設備的性能，而且還將給電力系統(tǒng)的穩(wěn)定、安全運行帶來風險，甚至引起系統(tǒng)電壓崩潰，造成大面積停電。多個國內(nèi)外的大停電事故都被證明是由于無功問題而引起電壓問題導致的。因此，，有針對性地進行無功電壓問題分析并據(jù)此提出優(yōu)化解決對策對于電網(wǎng)的安全、穩(wěn)定、經(jīng)濟運行都有著十分重要的意義。 本文綜述了無功電壓優(yōu)化模型和優(yōu)化算法，并指出了其研究發(fā)展方向；分析了含分布式能源（Distributed Generation，DG）接入電網(wǎng)的無功電壓控制方法研究現(xiàn)狀，結合當前研究現(xiàn)狀的分析，指出了現(xiàn)有關于含分布式電源的電網(wǎng)無功電壓控制研究的一些問題和不足；并在此基礎上，從DG互補規(guī)劃層面、配電網(wǎng)無功補償規(guī)劃層面、DG無功電壓控制層面、配電網(wǎng)無功電壓控制方面等角度，指出了含DG接入配網(wǎng)無功電壓控制研究中亟待解決的幾個問題。 本文以桂林電網(wǎng)為例，對桂林電網(wǎng)的運行現(xiàn)狀進行分析，進而總結出了桂林電網(wǎng)的運行特點。針對桂林220kV電網(wǎng)出現(xiàn)的電壓偏高等問題，首次提出了一種無功分層平衡分析方法，并對桂林220kV電網(wǎng)的實際運行狀況進行了無功分層平衡的分析。通過無功分層平衡的分析，揭示出220kV電網(wǎng)感性無功盈余是造成桂林電網(wǎng)電壓偏高的關鍵因素。接著分析了造成桂林電網(wǎng)無功過剩原因。 針對桂林電網(wǎng)由于無功過剩而引起電網(wǎng)電壓偏高的問題，提出了感性無功補償?shù)慕鉀Q對策，并對現(xiàn)有的兩種感性無功補償方式（低壓補償方式和高壓補償方式）的原理進行了分析。為確定最終感性無功補償方案，本文提出了一套從多個角度（調(diào)壓效果、適應未來電網(wǎng)發(fā)展趨勢、經(jīng)濟性、變電站新裝補償裝置可行性）對上述兩種感性無功補償規(guī)劃結果進行系統(tǒng)比較的體系。桂林電網(wǎng)算例的計算結果表明，低壓感性補償方案總體上要優(yōu)于高壓感性補償方案，且低壓感性補償方案能夠較好地解決桂林電網(wǎng)存在的無功電壓問題。為定量評估感性無功補償對于電壓越限風險的收益，本文引入了“電壓越限風險”、“風險收益”指標，提出了一種電壓越限風險收益的實用計算方法。 本文所開展的系統(tǒng)而深入的研究工作對于運行特性類似于桂林電網(wǎng)的地區(qū)電網(wǎng)無功電壓問題的解決具有理論指導意義和推廣價值，所提出的無功補償規(guī)劃比較體系為科學地選擇無功規(guī)劃方案提供了一種新思路。
[Abstract]:Voltage quality is one of the important indexes in power system power quality. Among the problems of voltage quality, voltage deviation is very harmful to power system. It will not only directly affect the performance of electrical equipment, but also bring risks to the stability and safe operation of power system. Even causes the system voltage to collapse, causes the large-scale power cut. Many power outages at home and abroad have been proved to be caused by voltage problems due to reactive power problems. Therefore, it is of great significance for the security, stability and economic operation of the power network to analyze the reactive power and voltage problems and put forward the optimal solutions accordingly. This paper summarizes the reactive power and voltage optimization model and algorithm, and points out its research and development direction, analyzes the research status of reactive voltage control method with Distributed generation DG connected to the power network, and analyzes the current research situation. This paper points out some problems and shortcomings of the current research on reactive power and voltage control of power network with distributed generation, and on this basis, from the DG complementary programming level, the distribution network reactive power compensation planning level DG reactive voltage control level. From the point of view of reactive power and voltage control of distribution network, the paper points out several problems to be solved urgently in the research of reactive power and voltage control of distribution network with DG. Taking Guilin Power Grid as an example, this paper analyzes the current operation situation of Guilin Power Grid, and sums up the operation characteristics of Guilin Power Grid. Aiming at the problem of high voltage in Guilin 220kV power network, a reactive power stratified balance analysis method is proposed for the first time, and the actual operation condition of Guilin 220kV power network is analyzed. Through the analysis of reactive power stratified balance, it is revealed that the inductive reactive power surplus is the key factor of the high voltage in Guilin power grid. Then the cause of reactive power surplus in Guilin power grid is analyzed. In view of the problem of high voltage caused by excess reactive power in Guilin power network, the countermeasures of inductive reactive power compensation are put forward. The principle of two kinds of inductive reactive power compensation (low voltage compensation and high voltage compensation) is analyzed. In order to determine the final inductive reactive power compensation scheme, this paper puts forward a set of methods from several angles (voltage regulation effect, adapting to the future power grid development trend, economic, etc.) The feasibility of the new compensator in substation) the system to compare the results of the two inductive reactive power compensation planning. The calculation results of Guilin power network show that the low-voltage inductive compensation scheme is better than the high-voltage inductive compensation scheme, and the low-voltage inductive compensation scheme can solve the reactive power and voltage problem in Guilin power network. In order to quantitatively evaluate the benefit of inductive reactive power compensation for voltage overrun risk, this paper introduces the index of "voltage overrun risk" and "risk return", and puts forward a practical calculation method of voltage overrun risk return. The systematic and in-depth research work carried out in this paper has theoretical guiding significance and popularizing value for solving the problem of reactive power and voltage in regional power grid with similar operation characteristics as Guilin power grid. The proposed reactive power compensation planning comparison system provides a new way for the scientific selection of reactive power planning schemes.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12
本文編號：2148460
[Abstract]:Voltage quality is one of the important indexes in power system power quality. Among the problems of voltage quality, voltage deviation is very harmful to power system. It will not only directly affect the performance of electrical equipment, but also bring risks to the stability and safe operation of power system. Even causes the system voltage to collapse, causes the large-scale power cut. Many power outages at home and abroad have been proved to be caused by voltage problems due to reactive power problems. Therefore, it is of great significance for the security, stability and economic operation of the power network to analyze the reactive power and voltage problems and put forward the optimal solutions accordingly. This paper summarizes the reactive power and voltage optimization model and algorithm, and points out its research and development direction, analyzes the research status of reactive voltage control method with Distributed generation DG connected to the power network, and analyzes the current research situation. This paper points out some problems and shortcomings of the current research on reactive power and voltage control of power network with distributed generation, and on this basis, from the DG complementary programming level, the distribution network reactive power compensation planning level DG reactive voltage control level. From the point of view of reactive power and voltage control of distribution network, the paper points out several problems to be solved urgently in the research of reactive power and voltage control of distribution network with DG. Taking Guilin Power Grid as an example, this paper analyzes the current operation situation of Guilin Power Grid, and sums up the operation characteristics of Guilin Power Grid. Aiming at the problem of high voltage in Guilin 220kV power network, a reactive power stratified balance analysis method is proposed for the first time, and the actual operation condition of Guilin 220kV power network is analyzed. Through the analysis of reactive power stratified balance, it is revealed that the inductive reactive power surplus is the key factor of the high voltage in Guilin power grid. Then the cause of reactive power surplus in Guilin power grid is analyzed. In view of the problem of high voltage caused by excess reactive power in Guilin power network, the countermeasures of inductive reactive power compensation are put forward. The principle of two kinds of inductive reactive power compensation (low voltage compensation and high voltage compensation) is analyzed. In order to determine the final inductive reactive power compensation scheme, this paper puts forward a set of methods from several angles (voltage regulation effect, adapting to the future power grid development trend, economic, etc.) The feasibility of the new compensator in substation) the system to compare the results of the two inductive reactive power compensation planning. The calculation results of Guilin power network show that the low-voltage inductive compensation scheme is better than the high-voltage inductive compensation scheme, and the low-voltage inductive compensation scheme can solve the reactive power and voltage problem in Guilin power network. In order to quantitatively evaluate the benefit of inductive reactive power compensation for voltage overrun risk, this paper introduces the index of "voltage overrun risk" and "risk return", and puts forward a practical calculation method of voltage overrun risk return. The systematic and in-depth research work carried out in this paper has theoretical guiding significance and popularizing value for solving the problem of reactive power and voltage in regional power grid with similar operation characteristics as Guilin power grid. The proposed reactive power compensation planning comparison system provides a new way for the scientific selection of reactive power planning schemes.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM761.12
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