本文選題：電壓穩(wěn)定 + 模糊控制��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：電壓穩(wěn)定是保證系統(tǒng)安全、穩(wěn)定、經(jīng)濟(jì)運(yùn)行的重要因素之一,電壓過低或過高都不能滿足系統(tǒng)穩(wěn)定運(yùn)行的要求,嚴(yán)重時(shí)將會損壞系統(tǒng)設(shè)備甚至導(dǎo)致電壓崩潰。隨著電力電子的快速發(fā)展,用于電壓無功控制的SVC、TCSC和可控高抗逐漸引起了研究人員的關(guān)注。FACTS裝置的引入在提高電壓穩(wěn)定性的同時(shí)也存在著交互影響,使得電壓穩(wěn)定問題并沒有得到有效的解決。本文根據(jù)電壓穩(wěn)定的控制特點(diǎn),提出了一種基于模糊控制和專家規(guī)則的電壓穩(wěn)定控制策略,其主要工作有： (1)在恒功率因數(shù)負(fù)荷和感應(yīng)電動機(jī)負(fù)荷下分析SVC和TCSC補(bǔ)償容量對電壓穩(wěn)定性的影響。首先介紹了FACTS裝置的工作原理和數(shù)學(xué)模型,然后基于潮流方程分析不同負(fù)荷水平下SVC和TCSC對電壓穩(wěn)定性的影響,分析結(jié)果表明在簡單系統(tǒng)中,一定范圍內(nèi)投入無功補(bǔ)償容量越多越有利于提高電壓水平,超過限值則不利于電壓穩(wěn)定的控制。 (2)提出了基于專家規(guī)則的電壓穩(wěn)定協(xié)調(diào)控制策略。通過分析不同電壓穩(wěn)定問題的控制特點(diǎn),對中長期電壓穩(wěn)定問題采用電壓差比例控制方式,而暫態(tài)電壓穩(wěn)定問題采用投切控制方式,并提出了基于專家規(guī)則的電壓穩(wěn)定協(xié)調(diào)控制策略,然后在PSASP軟件中設(shè)計(jì)SVC、TCSC和可控高抗控制器并進(jìn)行仿真驗(yàn)證。 (3)基于遺傳算法對SVC和TCSC的控制參數(shù)進(jìn)行優(yōu)化,結(jié)果表明當(dāng)兩者聯(lián)合補(bǔ)償時(shí),在一定范圍內(nèi)增大某一設(shè)備的補(bǔ)償容量,越有利于提高系統(tǒng)的電壓穩(wěn)定性,但是TCSC補(bǔ)償容量過多則會引起電壓波動甚至起到反作用,對電壓穩(wěn)定控制有不利影響。 (4)根據(jù)FACTS裝置對電壓穩(wěn)定問題的控制規(guī)則,進(jìn)一步提出采用模糊控制和專家規(guī)則以提高電壓穩(wěn)定水平的控制策略。首先介紹模糊控制原理,并在分析電壓穩(wěn)定控制規(guī)則的基礎(chǔ)上,提出了基于模糊控制和專家規(guī)則的電壓穩(wěn)定控制方法,然后設(shè)計(jì)了SVC和TCSC的模糊控制器,最后在Matlab仿真平臺上對模糊控制器的效果進(jìn)行了仿真分析。
[Abstract]:Voltage stability is one of the important factors to ensure the safety, stability and economic operation of the system. If the voltage is too low or too high, it can not meet the requirements of the stable operation of the system, which will damage the system equipment and even lead to the voltage collapse. With the rapid development of power electronics, the introduction of SVC TCSC and controllable high reactance (TCSC) for voltage and reactive power control has attracted the attention of researchers. The introduction of facts devices not only improves voltage stability, but also has interactive effects. The problem of voltage stability has not been solved effectively. According to the characteristics of voltage stability control, a voltage stability control strategy based on fuzzy control and expert rules is proposed in this paper. The main work is as follows: 1) the effect of compensation capacity of SVC and TCSC on voltage stability is analyzed under constant power factor load and induction motor load. This paper introduces the working principle and mathematical model of FACTS device, and then analyzes the influence of SVC and TCSC on voltage stability at different load levels based on power flow equation. The results show that in simple system, The more reactive power compensation capacity is in a certain range, the higher the voltage level is, but the more the limit is, the less the voltage stability control is. (2) an expert rule based coordinated control strategy for voltage stability is proposed. By analyzing the control characteristics of different voltage stability problems, the voltage difference proportional control method is adopted for the medium and long term voltage stability problems, while the switching control method is used for the transient voltage stability problems. The coordinated control strategy of voltage stability based on expert rule is proposed, and then the SVC TCSC and controllable high reactance controller are designed in PSASP software and verified by simulation. 3) the control parameters of SVC and TCSC are optimized based on genetic algorithm. The results show that increasing the compensation capacity of a certain equipment within a certain range is more beneficial to improve the voltage stability of the system. However, excessive compensation capacity of TCSC will cause voltage fluctuation or even counteraction, which has adverse effect on voltage stability control. 4) according to the control rules of voltage stability problem in FACTS, fuzzy control and expert rules are proposed to improve the voltage stability level. Firstly, the principle of fuzzy control is introduced, and based on the analysis of voltage stability control rules, a voltage stability control method based on fuzzy control and expert rule is proposed, and then the fuzzy controller of SVC and TCSC is designed. Finally, the effect of fuzzy controller is simulated and analyzed on Matlab simulation platform.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM712

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