超高压线路串补电容的微机保护算法

在超高压输电线路系统中,串联电容补偿具有提高输送容量和改善系统稳定性等优点,但由于串补电容的存在导致输电线路继电保护存在一系列问题。根据串补电容对距离保护和零序方向保护影响的理论分析,提出了基于TCSC串补电容的线路微机保护算法。算法利用TCSC的运行参数,考虑了串补电容在暂态过程以及电容运行状态对保护参数整定的影响,以避免TCSC使保护拒动或误动。最后通过仿真运行表明,该算法对于带有不同运行状态的TCSC的输电线路有很强的适应力和可靠性,可以满足线路继电保护的基本要求。     

TCSC运行原理及其在电网中的工程应用

可控串联补偿(TCSC)是柔性交流输电装置的典型代表,基于适当的控制策略TCSC能快速连续地调节输电线路电抗,减小因功率输送引起的电压降和功角差,提高线路输送能力和电力系统的稳定性.为使工程技术人员更好地掌握TCSC技术,主要分析TCSC的运行原理,在此基础上给出了TCSC在现代电网中的工程应用情况.     

天平可控串联补偿装置的动态模型及时域仿真

根据天平串联补偿一次设备的实际参数建立串联补偿的暂态模型;研究可控串联补偿装置(thyristorcontrolled series compensator,TCSC)的闭环控制系统的技术细节,并建立完整的仿真模型.以天平双回线路串联补偿模型的外部电网等值系统模拟正常运行、外部电网故障、本线路故障等情况下TCSC的动态...     

考虑FACTS及成本的输电阻塞管理方法

在开放的电力市场中,阻塞管理方法及阻塞成本的研究具有非常重要的理论和实用价值.利用柔性交流输电设备(FACTS)可以提高系统输电能力的特点,综合考虑了系统物理特性和经济特性,提出了结合灵敏度分析方法和系统最小阻塞管理成本的阻塞管理方法.首先建立了考虑确定晶闸管控制的串联电容器(TCSC)的线路模型;然后根据线路无功功率损耗灵敏度法和有功功率分布灵敏度法计算各线路的灵敏度系数,寻找方法对应的TCSC的安装线路;最后以系统阻塞管理成本最小为目标函数,确定TCSC的最优安装线路以及解决阻塞问题的方法.6节点系统的仿真分析结果验证了算法的有效性.     

可控串联补偿器的特性分析研究综述

随着电网规模的不断增大,输电质量和安全性也越来越重要。可控串联补偿(TCSC)作为柔性交流输电系统(FACTS)的重要组成部分,因其在串联补偿领域较高的性价比,是实际应用中最多且前景看好的FACTS装置。综述了国内外学者对TCSC的特性所做分析研究,对其未来的发展方向进行讨论和总结。     

TCSC数学模型和控制技术研究综述

随着电网的不断发展,高电压、远距离和大规模互联电网将是必然的发展趋势。可控串联补偿(TCSC)作为柔性交流输电系统(FACTS)的重要组成部分,是未来输电系统的支撑技术,在电力系统中的作用越来越重要。首先介绍了TCSC的基本原理和特点,然后从数学模型和控制方式两方面综述了TCSC研究的主要成果,最后总结了国内外的应用现状,并提出了一些存在的问题和对进一步研究的方向进行了展望。     

工厂大功率设备柔性串联补偿TCSC控制的研究

从柔性串联补偿器TCSC的补偿原理和结构分析出发,提出一种对大功率设备的柔性补偿方法。当负载等情况发生变化时,通过TCSC的调节保持其线路电压稳定,从而提高工厂用电的稳定,给出了应用硬件构成。同时由于TCSC现有控制方法不能有效的处理系统的非线性问题,导致控制难度大,因此采用基于DSP处理器的神经网络算法。     

提高电网输送能力的串补装置

串补装置是一种利用现代电力电子手段对交流输电线路进行串联补偿的装置,可以提高线路功率极限和电力系统稳定性。使用这样一套设备可以减少远距离输电线路的架设。串联补偿是将电容器组串联于交流输电线路中,用于补偿交流输电线路的电器。按照补偿阻抗的固定不变和可以调节,串补装置可分为固定串补(FSC)和可控串补(TCSC)。可控串补是通过电力电子的手段实现对串     

FACTS元件的可靠性成本/效益分析及其优化配置模型研究

柔性交流输电（FACTS）技术是对传统电网的革命性创新,能对电网可靠性产生重大影响。在综合兼顾可靠性和经济性的前提下,提出了基于可靠性成本/效益分析的静止同步补偿器(STATCOM)和晶闸管控制串联电容器（TCSC）的安装地点和安装容量的优化配置模型。该方法计及了FACTS元件的潮流计算和最优负荷削减模型,基于启发式思路实现了优化配置模型的逐次迭代算法：采用灵敏度分析方法对FACTS元件安装位置进行排序,再使用期望容量指标对其容量进行优化,通过逐次迭代求解系统总费用最小时的FACTS元件优化配置方案。采用该方法对RBTS可靠性测试系统进行了评估分析,计算结果验证了方法的可行性和正确性。     

成碧220 kV可控串补装置的运行与维护

我国第一套国产220 kV交流输电线路的可控串联补偿装置(thyristor-controlled series compensator,TCSC)于2004年12月26日在甘肃陇南电网220kV成碧线投入运行。投运近两年来,经受了冬季低温和汛期大负荷的考验,整体运行情况良好。通过调研国内外TCSC的运行情况,对成碧TCSC与其它TCSC的运行情况进行了对比,指出补充和完善国产化TCSC的运行、检修、实验技术规范的必要性。提出提高TCSC装置电磁兼容能力,建立国产化TCSC的技术标准体系,解决装设TCSC装置线路的继电保护距离I段暂态超越或保护范围太短的问题及优化TCSC与电力系统稳定器、安全自动装置等设备的协调运行问题,并积极推广TCSC技术应用的建议。     

含TCSC电力系统可靠性非同调分析

判别非同调元件及其参数,有助于改善电力系统可靠性。计及可控串补及其旁路断路器,建立可控串补线路三状态模型,继而建立含串补线路电力系统可靠性解析模型。从串补线路输电能力和系统失负荷概率两个角度,分析可靠性参数非同调和元件非同调,定义同调裕度,推导非同调临界条件。量化了补偿度、可靠性参数、系统负荷水平、串补线路载荷约束对非同调的影响。算例结果表明:可控串补或断路器不可用率大于临界值时系统非同调;补偿度越小、负荷水平越低、串补线路载荷约束范围越宽,系统非同调越容易发生;相比可控串补,断路器故障更易使系统非同调。     

柔性交流输电系统交直流潮流可靠性评估模型

根据串联补偿器(TCSC)、晶闸管控制移相器(TCPST)和统一潮流控制器(UPFC)的工作原理,从交流和直流潮流的视角建立了潮流计算和最优负荷削减模型,采用状态枚举法在RBTS可靠性测试系统中进行分析和验证,结果表明采用交流潮流模型能更准确评估FACTS元件对系统可靠性的影响;而直流潮流模型计算耗时较少,且当节点电压约束不是刚性约束时,所得结果与交流潮流模型结果相近.     

A study of thyristor controlled series capacitor models for power system stability analysis

The thyristor‐controlled series capacitor (TCSC) is promising as a powerful device to increase power transfer capability and transient stability. The basic configuration of the TCSC consists of a series of capacitors connected antiparallel with thyristor‐controlled reactors, so that firing angle control of the thyristors makes the TCSC capable of achieving impedance control in a wide range with quick response. It is important to clarify the relationship between the fundamental reactance of the TCSC and the firing angle of the thyristors, thus leading to practical applications of the TCSC for enhancement of power transfer capability and transient stability in transmission lines. Two relationship equations for the TCSC's fundamental reactance have already been proposed. One is the relationship equation derived from a TCSC circuit whose source is a voltage. The other is the relationship equation derived from a TCSC circuit whose source is a current. For TCSC installed in a transmission line, it is clear which equation is more adequate for analyzing power system stability. In this paper, the authors determine whether either of the equations is valid for analyzing a power system stability.

• 1. In the steady state, the TCSC fundamental reactance is analyzed and compared with the two equations and EMTP. It is clear that the TCSC reactance based on current source is adequate.
• 2. The swing angle of a generator when the firing angle is stepped up is analyzed with EMTP and an analytical model using the TCSC model based on current source. It is shown that the proposed model is effective for power system stability analysis. © 1999 Scripta Technica, Electr Eng Jpn, 129(1): 20–28, 1999

     

基于模极大值的高压串补输电线路保护新方法的研究

提出了基于小波变换模极大值的高压串补输电线路保护新方法,该方法利用小波变换对高压串补输电线路两侧的电流信号进行分解,得到突变点的模极大值乘积符号,从而准确地区分内部故障和外部故障.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RTIDS对串补线路的各种内外部故障进行了全...     

Subsynchronous resonance analysis using a discrete time model of thyristor controlled series compensator

The characteristic of a thyristor controlled series compensator (TCSC) is nonlinear in nature. Usually the TCSC control systems employs a conventional type controller to obtain the reactance order, which in turn, is converted into the corresponding firing angle of the TCR through a look-up table. The main drawback of this approach is the absence of a closed-loop model through which the stability of the system can be analyzed. To alleviate this problem a linear, discrete-time state space model of a TCSC compensated transmission line in the d–q domain is proposed (Srivastava et al., Model-based control design of a TCSC compensated power system, to appear in Electrical Power and Energy Systems). This model is further utilized in this paper for damping torsional oscillations arising due to subsynchronous resonance (SSR). The model is interfaced with synchronous generator and turbine-shaft models to obtain a closed form homogeneous state space representation that is suitable for eigenvalue analysis. Through eigenvalue analysis it is shown that proper choice of control gains can effectively damp out SSR. The eigenvalue analysis results are subsequently validated through PSCAD/EMTDC simulation studies.     

基于TCSC技术和粒子群优化算法的电力系统阻塞疏导方法

提出了一种基于晶闸管控制的串连电容器(thyristor controlled series capacitor,TCSC)技术和粒子群优化算法的电力系统阻塞疏导方法。首先根据线路灵敏度分析确定安装TCSC的线路;然后提出了电力市场环境下电网中含有TCSC装置的阻塞疏导计算数学模型;最后运用粒子群优化算法对这一数学模型进行参数优化,达到疏导电网阻塞的目的。IEEE 14节点系统算例表明,基于TCSC技术进行电网阻塞疏导是有效、合理的。     

Advance Compensated Mho Relay Algorithm for a Transmission System with Shunt Flexible AC Transmission System Device

Abstract—The presence of shunt flexible AC transmission system devices adversely affect the performance of distance relay and create security and reliability issues. This article introduces a noble compensated Mho relay algorithm for the protection of transmission line employing shunt flexible AC transmission system devices, such as a static VAR compensator and static synchronous compensator. A detailed model of transmission system employing a shunt flexible AC transmission system device is explained. Then compensated impedance inserted by a shunt device in the transmission line is calculated, and finally, a compensated Mho relay algorithm is proposed to protect zone one of the transmission line. Simulation work is carried out in PSCAD/EMTP software. Results show that the proposed relay is secure, accurate, and reliable under the wide variation in power system parameters, such as load angle, fault resistance, fault location, and compensation level.