摘要
串联电容补偿技术可以提高输电线路的输送能力,减少输送损耗,提高电力系统运行的稳定性,灵活调节系统潮流,抑制系统低频振荡和次同步谐振等作用,从而在电力系统中得到了广泛应用。但是串补电容的引入给电力系统带来了电压反向、电流反向以及低频和高频分量等问题,给现有的输电线路保护带来了巨大影响。
本文首先对串联补偿装置的工作特性进行了全面阐述,其次在对串联补偿给电力系统带来的电压反向、电流反向问题进行分析的基础上,就串联补偿装置对传统的输电线路保护即距离保护、工频故障分量距离保护、方向保护、纵联保护等的影响进行了详细而全面的分析研究。
本文在小波变换的基础上提出了适合于串补线路的新算法。在电力系统实时数字仿真器(RTDS)中搭建含固定串补和可控串补的广西500kV电网仿真系统,利用RTDS对串补线路的各种内外部故障进行了全面仿真。编制程序对串补线路两侧的故障信号进行小波变换,利用两侧信号的小波变换模极大值的乘积符号来区分串补线路的内部故障和外部故障,从而得到新算法。算法仿真结果表明该算法不受可控串补动态特性的影响,算法快速简单并具有较高可靠性。
IEC 61850是国际电工委员会第57技术委员会(IEC TC57)发布的迄今为止最为完善的关于变电站自动化的通信标准。本文在详细阅读和分析IEC 61850的原始文档资料的基础上,探讨了基于IEC 61850输电线路的纵联保护功能的建模方法,对基于IEC 61850的纵联保护通信模式进行了研究分析。
Series capacitor compensation technology has been widely used in power systems due to its many kinds of functions such as increased transmission capability, enhanced the voltage and transient stability, regulating power flow flexibly, restraining low-frequency system oscillation and sub-synchronous resonance, etc. However, some phenomena such as voltage and/or current inversion, lower-fredquency transient components and sub-harmonic oscillations are issues related with series capacitors installation on transmission lines, thus have a serious impact on existing relay protection of transmission line.
This thesis investigates the characteristic of series capacitor compensation equipment, analyses the associated voltage and current inversion phenomena, and their impact on traditional relay protection of transmission lines such as directional protection relaying, pilot protection schemes such as distance and line differential protection. An algorithm using power frequency fault components due to series capacitor compensation is discussed.
A new approach for series compensated transmission line based on wavelet transformation is presented in the thesis. A 500kV GuangXi power system simulation model including fixed series capacitor (FSC) and thrister controlled series capacitor (TCSC) is constructed using the Real-Time Digital Simulator (RTDS). Various fault types presented in and out the protected line located before or after the vapacitor are simulated. Faulty current signals at the realying points on both sides of the series capacitor (SC) compensated line are discomposed based on wavelet transformation. The sign of wavelet transformation modulus maxima product is used to discriminate between internal faults and external faults. This new approach is proved to be fast , reliable, and simple, and what's more, it is not affected by TCSC dynamic characteristic.
IEC 61850 is a global standard foster interoperability between devices and systems from different vendors, is the latest international standard about seamless communication networks and systems in substations published by International Electrotechnical Commission technical committees 57(IEC TC57). This thesis also studies the feasibility of using IEC 61850 for information exchange between relays located at both ends of the line, and discusses the communication mode of transmission line pilot protection using IEC 61850 technology.
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