【摘要】：2016年6月前,云南電網(wǎng)通過(guò)4回500kV交流線(xiàn)路與南方電網(wǎng)主網(wǎng)相連,發(fā)生解列導(dǎo)致高頻的概率較小,僅在多回直流同時(shí)雙極閉鎖等復(fù)雜故障下才存在解網(wǎng)的可能。2016年6月以后云南電網(wǎng)和南方電網(wǎng)主網(wǎng)實(shí)現(xiàn)異步聯(lián)網(wǎng),異步聯(lián)網(wǎng)后,云南電網(wǎng)的穩(wěn)定特性發(fā)生了很大的變化。與異步聯(lián)網(wǎng)前相比,功角穩(wěn)定問(wèn)題減弱,而頻率穩(wěn)定問(wèn)題突出。眾所周知,負(fù)荷模型(特別是負(fù)荷頻率特性)對(duì)電網(wǎng)頻率穩(wěn)定特性有顯著的影響。云南電網(wǎng)負(fù)荷模型一直延用幾十年前的負(fù)荷模型,負(fù)荷模型已不能反映實(shí)際。云南電網(wǎng)負(fù)荷中高載能負(fù)荷占有較大比重,中頻爐在冶煉、制造等高載能行業(yè)廣泛應(yīng)用,研究中頻爐負(fù)荷特性及其模型對(duì)研究整個(gè)云南負(fù)荷特性有重要的理論與實(shí)際意義。本文根據(jù)中頻爐實(shí)際生產(chǎn)工藝以及電路原理對(duì)其負(fù)荷特性展開(kāi)了研究。在研究過(guò)程中,先研究了不考慮配電網(wǎng)絡(luò)的中頻爐負(fù)荷特性,然后研究了計(jì)及配電網(wǎng)絡(luò)后的總體負(fù)荷特性。對(duì)兩種不同情況下負(fù)荷頻率和電壓因子進(jìn)行了推導(dǎo),并利用MATLAB/Simulink對(duì)其進(jìn)行仿真分析,仿真所得結(jié)論與理論推導(dǎo)所得負(fù)荷特性因子一致。結(jié)果表明,考慮配電網(wǎng)絡(luò)前后,中頻爐負(fù)荷頻率特性無(wú)明顯變化,而電壓特性變化較明顯。在研究中頻爐負(fù)荷特性基礎(chǔ)上,進(jìn)行了中頻爐負(fù)荷建模研究,考慮了恒功率與恒阻抗相結(jié)合的負(fù)荷模型、綜合負(fù)荷模型兩種情況。利用MATLAB/Simulink仿真表明,考慮配網(wǎng)阻抗在內(nèi)的等效綜合負(fù)荷模型負(fù)荷特性與實(shí)際中頻爐負(fù)荷特性更相近,且能更直接地反映負(fù)荷節(jié)點(diǎn)負(fù)荷特性。因此,可采用等效綜合負(fù)荷模型負(fù)荷特性因子反映中頻爐負(fù)荷特性。最后,對(duì)配網(wǎng)長(zhǎng)度與等效綜合負(fù)荷模型的關(guān)系進(jìn)行了討論,結(jié)果表明,當(dāng)配網(wǎng)線(xiàn)路長(zhǎng)度小于1km時(shí),可忽略配網(wǎng)阻抗對(duì)等效負(fù)荷模型產(chǎn)生的影響;而當(dāng)配網(wǎng)線(xiàn)路長(zhǎng)度大于1km時(shí),則在對(duì)等效綜合負(fù)荷模型負(fù)荷特性研究時(shí),應(yīng)該考慮配網(wǎng)影響。
[Abstract]:Before June 2016, Yunnan Power Grid was connected to the main network of Southern Power Grid through four 500kV AC lines, which resulted in a low probability of high frequency. After June 2016, the asynchronous network between Yunnan Power Grid and Southern Power Grid has been realized. After asynchronous interconnection, the stability characteristics of Yunnan Power Grid have changed greatly. Compared with before asynchronous interconnection, the power angle stability problem is weakened, while the frequency stability problem is prominent. It is well known that the load model (especially the load frequency characteristic) has a significant influence on the frequency stability of the power network. The load model of Yunnan power grid has been used for decades, but the load model can not reflect the actual situation. The load of Yunnan power grid occupies a large proportion of the high energy load, and the if furnace is widely used in smelting, manufacturing and other high-load energy industries. It is of great theoretical and practical significance to study the load characteristics and its model of the intermediate frequency furnace in Yunnan Province. In this paper, the load characteristics of if furnace are studied according to its actual production process and circuit principle. In the research process, the load characteristics of if furnace without considering the distribution network are studied first, and then the overall load characteristics after considering the distribution network are studied. The load frequency and voltage factor under two different conditions are deduced and simulated by MATLAB/Simulink. The simulation results are consistent with the load characteristic factors derived from the theoretical analysis. The results show that before and after considering the distribution network, the load frequency characteristic of if furnace has no obvious change, but the voltage characteristic is obvious. On the basis of studying the load characteristics of intermediate frequency furnace, the load modeling of intermediate frequency furnace is studied. The load model combined with constant power and constant impedance is considered, and the integrated load model is considered. The MATLAB/Simulink simulation shows that the load characteristics of the equivalent integrated load model, including the impedance of the distribution network, are closer to those of the actual if furnace, and can reflect the load characteristics of the load node more directly. Therefore, the load characteristic factor of the equivalent integrated load model can be used to reflect the load characteristics of intermediate frequency furnace. Finally, the relationship between the distribution network length and the equivalent integrated load model is discussed. The results show that the influence of the distribution network impedance on the equivalent load model can be ignored when the distribution line length is less than 1km, and when the distribution line length is larger than 1km, The influence of distribution network should be taken into account when studying the load characteristics of equivalent integrated load model.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM714;TM743

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