【摘要】：近年來,為了盡可能的提高電網(wǎng)輸送能力、實現(xiàn)電網(wǎng)可控運行,我國大區(qū)性電網(wǎng)正迅速發(fā)展為全國交直流互聯(lián)電網(wǎng)。高壓直流輸電技術(shù)(HVDC)與統(tǒng)一潮流控制器(UPFC)的出現(xiàn)與應(yīng)用為現(xiàn)代交直流電網(wǎng)互聯(lián)創(chuàng)造了有利條件:一方面,高壓直流輸電(HVDC)技術(shù)由于在高電壓、大容量、遠(yuǎn)距離、低損耗輸電和電網(wǎng)互聯(lián)等方面的優(yōu)勢而得到廣泛應(yīng)用;另一方面,統(tǒng)一潮流控制器(UPFC)作為最具創(chuàng)造性且功能最強(qiáng)大的FACTS元件而得到普遍重視和研究。然而,隨著交流系統(tǒng)與直流系統(tǒng)之間的耦合越來越緊密,電力系統(tǒng)的穩(wěn)定高效運行對深入分析HVDC與UPFC之間的交互作用也提出了更高要求。針對這一課題,本文的研究內(nèi)容分為以下幾個部分:首先,介紹了含HVDC與UPFC的基本結(jié)構(gòu)、數(shù)學(xué)模型與控制方式,并選擇了本文所用到的模型與方式,進(jìn)而建立了含HVDC與UPFC的多機(jī)電力系統(tǒng)數(shù)學(xué)模型,得到了描述交直流互聯(lián)系統(tǒng)的微分方程、代數(shù)方程以及輸出方程。其次,介紹了相對增益矩陣法(RGA)的基本原理、性質(zhì)、評定標(biāo)準(zhǔn),以及已解決的程度和未解決的難點,并推導(dǎo)了在電力系統(tǒng)交互影響評定中的RGA計算公式。最后,對蘇南電網(wǎng)這一實際算例,計算了不同工況下的相對增益矩陣,RGA計算結(jié)果表明此實例中兩回直流輸電線路與統(tǒng)一潮流控制器之間交互影響很弱,非線性時域仿真的結(jié)果也驗證了這一點。
[Abstract]:In recent years, in order to improve the transmission capacity of the power network as much as possible and realize the controllable operation of the power network, the large area power grid of our country is rapidly developing into the national AC / DC interconnection network. The emergence and application of HVDC transmission technology (HVDC) and unified power flow controller (UPFC) have created favorable conditions for the interconnection of modern AC / DC power networks. On the one hand, the (HVDC) technology of HVDC transmission is due to high voltage, large capacity and long distance. On the other hand, the unified power flow controller (UPFC), as the most creative and powerful FACTS component, has been widely used. However, as the coupling between AC system and DC system becomes more and more close, the stable and efficient operation of power system requires further analysis of the interaction between HVDC and UPFC. The research content of this paper is divided into the following parts: firstly, the basic structure, mathematical model and control mode of HVDC and UPFC are introduced, and the model and mode used in this paper are selected. Furthermore, the mathematical model of multi-machine power system including HVDC and UPFC is established, and the differential equation, algebraic equation and output equation are obtained to describe the AC / DC interconnected system. Secondly, the basic principle, properties, evaluation criteria, degree of solution and unsolved difficulties of relative gain matrix method (RGA) are introduced, and the calculation formula of RGA in power system interaction assessment is derived. Finally, for the practical example of Southern Jiangsu Power Grid, the RGA calculation results of the relative gain matrix under different working conditions show that the interaction between the two-circuit HVDC transmission line and the unified power flow controller is very weak in this example. The nonlinear time domain simulation results also verify this point.
【學(xué)位授予單位】：華北電力大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM72

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本文編號：2220341