本文選題：靜止無功補償器 + 光控晶閘管　； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著國內(nèi)電力系統(tǒng)的迅速發(fā)展,電壓的等級要求越來越高,超高壓和特高壓電網(wǎng)已經(jīng)成功投入運行,進而導(dǎo)致大容量的無功急需在電網(wǎng)運行中進行補償。電力電子技術(shù)的高速發(fā)展,計算機控制技術(shù)的更新?lián)Q代使得用戶對電網(wǎng)的運行可靠性與電能質(zhì)量的要求越來越高,高壓大容量的補償裝置需要投入其中,這是提高系統(tǒng)穩(wěn)定性的有效措施之一。實行峰谷分時電價后,高峰段的集中用電,造成了電網(wǎng)的電壓波動加大,由于沒有足夠的動態(tài)無功調(diào)節(jié)手段,給部分電力用戶造成了一定的影響。采用靜止無功補償器(SVC)是解決以上這些問題的有效措施之一,它在解決電網(wǎng)穩(wěn)定性以及配電電能質(zhì)量等問題中發(fā)揮了重要的作用,它是目前各國普遍采用的先進技術(shù)。SVC技術(shù)是利用并聯(lián)電容器向系統(tǒng)提供無功,依靠可變電抗器調(diào)節(jié)和(或)電容器的投切向系統(tǒng)提供連續(xù)、可調(diào)的無功功率。本課題依據(jù)撫順市李石寨變電站實際,研制了一套基于光控晶閘管的70Mvar TCR型66k V直掛SVC裝置,在正常情況下,可降低撫順電網(wǎng)一次有功功率網(wǎng)損,為系統(tǒng)提供無功功率70Mvar,提高系統(tǒng)調(diào)相調(diào)壓能力和電網(wǎng)的輸送能力,特別是配電系統(tǒng)調(diào)壓能力提高10%以上,改善配電66k V側(cè)電能質(zhì)量[1]。為解決光控觸發(fā)SVC補償裝置中,傳輸光信號的光纖一旦損壞,更換時必須重新訂做一個相應(yīng)長度的光纖,再次穿入新的光纖,以及光信號經(jīng)過長距離的傳輸,損耗較大,易造成誤觸發(fā),系統(tǒng)可靠性低等缺點。本課題采用LTT脈沖觸發(fā)光纖分配裝置,使系統(tǒng)的安裝簡單,維護方便,抗干擾性強,可靠性高,使用壽命長。最后通過對SVC裝置在李石寨變電站投運前后電壓曲線的不同,可以看出投運后66k V母線電壓穩(wěn)定在67.5±0.5k V范圍內(nèi),提高了電能質(zhì)量,降低了系統(tǒng)電壓的波動幅度,改善了系統(tǒng)無功潮流的分布,滿足了對望花熱電廠穩(wěn)定運行、高危客戶可靠供電的要求,對系統(tǒng)安全穩(wěn)定運行具有重大意義。
[Abstract]:With the rapid development of domestic power system, the requirement of voltage grade is higher and higher. The UHV and UHV power networks have been successfully put into operation, which leads to the large capacity of reactive power urgently needed to be compensated in the operation of the power network. With the rapid development of power electronics technology and the upgrading of computer control technology, the users have higher and higher requirements for the reliability and power quality of the power network, and the high-voltage and large-capacity compensators need to be put into it. This is one of the effective measures to improve the stability of the system. After the implementation of peak-valley time-sharing price, the concentrated power consumption in the peak section leads to the increase of the voltage fluctuation of the power network, and the lack of sufficient dynamic reactive power regulation means has a certain impact on some power users. SVC (static Var compensator) is one of the effective measures to solve these problems. It plays an important role in solving the problems of power network stability and distribution power quality. It is an advanced technology which is widely used in many countries at present. It uses shunt capacitors to provide reactive power to the system, and provides continuous and adjustable reactive power by variable reactor regulation and / or capacitor switching system. According to the actual situation of Fushun Lishizhai substation, a set of 70Mvar TCR type 66kV direct hanging SVC device based on optical thyristor is developed in this paper. Under normal conditions, it can reduce the loss of primary active power network in Fushun power grid. For the system to provide reactive power 70 Mvar. to improve the system phase modulation capacity and the transmission capacity of the grid, especially the distribution system voltage regulation capacity to increase by more than 10%, to improve the distribution 66kV side of the power quality [1]. In order to solve the problem of optical trigger SVC compensation device, once the optical fiber transmitting optical signal is damaged, it is necessary to make a new fiber of corresponding length when it is replaced, and the optical signal is transmitted over a long distance. It is easy to cause false trigger, low system reliability and other shortcomings. In this paper, LTT pulse triggered fiber distribution device is used to make the system easy to install, easy to maintain, strong anti-interference, high reliability and long service life. Finally, according to the difference of voltage curve before and after the operation of SVC device in Lishizhai substation, it can be seen that the voltage of 66 kV bus is stable in the range of 67.5 鹵0.5 kV after operation, which improves the power quality and reduces the fluctuation range of system voltage. It improves the distribution of reactive power flow, meets the requirements of reliable power supply for Wanghua Thermal Power Plant and high risk customers, and is of great significance to the safe and stable operation of the system.
【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】：2017
【分類號】：TM761.12

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