本文選題：無(wú)功電壓 + 送受端電壓模值比��； 參考：《東北電力大學(xué)》2017年碩士論文

【摘要】：近年來(lái),環(huán)保壓力越來(lái)越大,傳統(tǒng)的以煤電為主的電源發(fā)展模式已經(jīng)越來(lái)越難以為繼。而我國(guó)地域遼闊,南北方、中西部與中東部資源分布、全社會(huì)的用電量逐年增大,為解決中東部地區(qū)負(fù)荷中心的電力供給不足的問(wèn)題,急需解決大容量、超遠(yuǎn)距離的輸電技術(shù)問(wèn)題。此外,根據(jù)聯(lián)合國(guó)氣候發(fā)展峰會(huì)《巴黎協(xié)定》的要求以及“一帶一路”宏偉發(fā)展藍(lán)圖的構(gòu)想,為更好的優(yōu)化資源配置,國(guó)與國(guó)之間的電力輸電走廊建設(shè)會(huì)越來(lái)越多,很多地方的電力傳輸距離將會(huì)超過(guò)3000km。半波長(zhǎng)交流輸電以其顯著的技術(shù)經(jīng)濟(jì)優(yōu)勢(shì),在超遠(yuǎn)距離點(diǎn)對(duì)點(diǎn)輸電模式中,具有較強(qiáng)的競(jìng)爭(zhēng)優(yōu)勢(shì)和廣闊的工程應(yīng)用前景。對(duì)于特高壓交流輸電技術(shù)而言,類半波長(zhǎng)線路、常規(guī)的中長(zhǎng)線路、短線路的主要電氣參數(shù)如沿線電壓、電流,在輸電線路的長(zhǎng)度達(dá)到某一個(gè)量值時(shí)就會(huì)發(fā)生很明顯的變化。本文正是以均勻無(wú)損傳輸線理論作為理論基礎(chǔ),參照已經(jīng)成功投運(yùn)的特高壓遠(yuǎn)距離交流輸電線路示范工程,就特高壓交流半波長(zhǎng)輸電技術(shù)的相關(guān)問(wèn)題進(jìn)行初步探索。分析目前遠(yuǎn)距離輸電的研究現(xiàn)狀,并比較了各種遠(yuǎn)距離輸電技術(shù)的經(jīng)濟(jì)技術(shù)的優(yōu)劣,提出了相應(yīng)的技術(shù)路線。以自然功率為基準(zhǔn),找出了傳輸功率與沿線電壓關(guān)系,編程進(jìn)行求算仿真出了沿線電壓、電流隨傳輸功率變化的波形,并提出自然功率和波阻抗這兩個(gè)關(guān)鍵性的指標(biāo),并以送受端無(wú)功功率需求量為評(píng)價(jià)指標(biāo),證明了半波長(zhǎng)線路阻抗參數(shù)的有效性;利用第一章和第二章得出的結(jié)論,得出了沿線電壓、電流沿線的變化,并且從首末端傳輸功率的參數(shù)方程和靜態(tài)穩(wěn)定性兩個(gè)方面證明了半波長(zhǎng)輸電線路傳輸功率的極限值;從功率傳輸?shù)臋C(jī)理和電氣諧振兩個(gè)方面說(shuō)明了功率傳輸對(duì)沿線電壓的影響;提出評(píng)價(jià)輸電線路經(jīng)濟(jì)運(yùn)行的一個(gè)指標(biāo)—線損率,通過(guò)逐步增大傳輸功率得出了在線路傳輸自然功率時(shí)線損率最低的結(jié)論;通過(guò)設(shè)定不同地點(diǎn)的不同的短路故障類型,得出了沿線過(guò)電壓的水平并從機(jī)理上分析了故障處非故障相電壓升高的原因,并做了對(duì)應(yīng)的仿真曲線,進(jìn)行理論分析驗(yàn)證;在輸電線路穩(wěn)態(tài)運(yùn)行時(shí),穿越無(wú)功的多少在一定程度上決定了特高壓輸電線路運(yùn)行的經(jīng)濟(jì)性,為使得運(yùn)行經(jīng)濟(jì)性最優(yōu),必須使得對(duì)應(yīng)的穿越無(wú)功最小。因此,將穿越無(wú)功進(jìn)行分解,并找出對(duì)應(yīng)分解的各部分穿越無(wú)功與送受端電壓模值比的等式關(guān)系,以建立相應(yīng)的目標(biāo)函數(shù)。以沿線電壓的峰值、特高壓半波長(zhǎng)輸電系統(tǒng)與下網(wǎng)配合的無(wú)功補(bǔ)償容量等作為不等式或等式的約束條件,得出了最優(yōu)解,并且和普通控制策略相比證明了此種控制算法的有效性,也為現(xiàn)場(chǎng)的實(shí)際運(yùn)行提供了有益的參考。
[Abstract]:In recent years, the pressure of environmental protection is increasing, and the traditional mode of power supply based on coal power has become more and more difficult to sustain. The vast territory of China, the distribution of resources in the south and north, the central and western regions and the central and eastern parts of China, and the increasing power consumption of the whole society year by year, in order to solve the problem of insufficient power supply in the load centers in the central and eastern regions, it is urgent to solve the problem of large The problem of super long distance transmission technology. In addition, in accordance with the requirements of the United Nations Climate Development Summit Paris Accord and the vision of the "Belt and Road" ambitious development blueprint, there will be more and more power transmission corridors between countries for better resource allocation. In many places the distance between electricity transmission will be more than 3000 km. Half-wavelength AC transmission has strong competitive advantage and broad engineering application prospect in ultra-long distance point-to-point transmission mode because of its remarkable technical and economic advantages. For UHV AC transmission technology, the main electrical parameters such as voltage and current along the transmission line will change obviously when the length of transmission line reaches a certain value. Based on the theory of uniform lossless transmission line and referring to the demonstration project of UHV long distance AC transmission line which has been successfully put into operation, this paper makes a preliminary exploration on the related problems of UHV AC half wavelength transmission technology. This paper analyzes the present research situation of long distance transmission, compares the advantages and disadvantages of various long distance transmission technologies, and puts forward the corresponding technical route. Based on the natural power, the relation between the transmission power and the voltage along the line is found, and the waveform of the voltage and current along the line is simulated by programming. The two key indexes of natural power and impedance are put forward. Taking the reactive power demand of the receiving end as the evaluation index, the validity of the impedance parameters of the half-wavelength transmission line is proved, and the changes of the voltage and current along the line are obtained by using the conclusions obtained in the first and second chapters. The limit value of transmission power of half-wavelength transmission line is proved from the parameter equation of transmission power at the first and end and static stability, and the influence of power transmission on the voltage along the line is explained from the two aspects of power transmission mechanism and electric resonance. This paper puts forward an index to evaluate the economic operation of transmission lines-line loss rate. By increasing the transmission power step by step, the conclusion that the line loss rate is the lowest when the natural power is transmitted on the transmission line is obtained, and different short circuit fault types are set up in different locations. The level of overvoltage along the line is obtained and the cause of the rise of non-fault phase voltage at fault is analyzed from the mechanism, and the corresponding simulation curve is made for theoretical analysis and verification. To a certain extent, the economy of UHV transmission lines is determined by the amount of reactive power traversing. In order to make the operation economy optimal, the corresponding traversing reactive power must be minimized. Therefore, the traversing reactive power is decomposed, and the equality relation between the ratio of traversing reactive power and the voltage mode value ratio of the corresponding decomposition is found, and the corresponding objective function is established. Taking the peak voltage along the line and the reactive power compensation capacity of UHV half-wavelength transmission system as the constraints of inequality or equality, the optimal solution is obtained. Compared with the conventional control strategy, the effectiveness of the proposed control algorithm is proved, and it also provides a useful reference for the practical operation of the field.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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