基于RGA原理的HVDC与UPFC交互影响研究

发布时间：2018-09-03 15:08

【摘要】：近年来,为了尽可能的提高电网输送能力、实现电网可控运行,我国大区性电网正迅速发展为全国交直流互联电网。高压直流输电技术(HVDC)与统一潮流控制器(UPFC)的出现与应用为现代交直流电网互联创造了有利条件:一方面,高压直流输电(HVDC)技术由于在高电压、大容量、远距离、低损耗输电和电网互联等方面的优势而得到广泛应用;另一方面,统一潮流控制器(UPFC)作为最具创造性且功能最强大的FACTS元件而得到普遍重视和研究。然而,随着交流系统与直流系统之间的耦合越来越紧密,电力系统的稳定高效运行对深入分析HVDC与UPFC之间的交互作用也提出了更高要求。针对这一课题,本文的研究内容分为以下几个部分:首先,介绍了含HVDC与UPFC的基本结构、数学模型与控制方式,并选择了本文所用到的模型与方式,进而建立了含HVDC与UPFC的多机电力系统数学模型,得到了描述交直流互联系统的微分方程、代数方程以及输出方程。其次,介绍了相对增益矩阵法(RGA)的基本原理、性质、评定标准,以及已解决的程度和未解决的难点,并推导了在电力系统交互影响评定中的RGA计算公式。最后,对苏南电网这一实际算例,计算了不同工况下的相对增益矩阵,RGA计算结果表明此实例中两回直流输电线路与统一潮流控制器之间交互影响很弱,非线性时域仿真的结果也验证了这一点。
[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.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM72

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