统一潮流控制器的建模与控制研究综述

灵活交流输电系统（ＦＡＣＴＳ）技术是近几年来出现的一项新技术,统一潮流控制器（ＵＰＦＣ）是ＦＡＣＴＳ控制器中乞今最全面的控制器,可提供对传输线路参数（即电压、线路阻抗和相角）的全面动态控制,能够快速控制传输线路的有功和无功功率及母线电压。首先由考虑ＵＰＦＣ的电力系统潮流调节问题讨论了ＵＰＦＣ的建模,然后从控制角度综述了目前国内外研究ＵＰＦＣ的最新成果,概述了ＵＰＦＣ的各种控制策略,并分析了ＵＰＦＣ     

统一潮流控制器对继电保护运行影响的仿真研究

利用基于实际法建立的ＲＡＺＦＥ型距离保护的仿真软件,对含有统一潮流控制器（ＵＰＦＣ）的交流系统进行了仿真计算,并通过设置不同类型的故障,将此系统与普通的交流输电系统,继电保护装置的动作行国进行分析比较,发现ＵＰＦＣ安装在保护线路的背后时,保护动作信息将有所变化,但不影响保护的正确动作,这种将保护装置的数字仿真与含有ＵＰＦＣ的ＦＡＣＴＳ系统的数字仿真相结合的方式,为研究ＦＡＣＴＳ元件的输电系统原有继     

基于PSASP程序的FACTS潮流建模

基于注入功率法分别建立统一潮流控制器（ＵＰＦＣ）和可控串联电容补偿器（ＴＣＰＳ）的潮流模型,并利用电力系统分析综合程序（ＰＳＡＳＰ６．０）提供的用户自定义模型和用户程序接口构造了适合于ＰＳＡＳＰ的相应的潮流算法,可以用来分析灵活交流输电技术（ＦＡＣＴＳ）在给定控制变量和控制目标下的潮流收敛特性。ＩＥＥＥ１４节点系统作为算例被用来研究不同控制方式下的系统潮流特性,计算结果证明了模型的合理性。     

含UPFC电力系统的潮流计算研究

柔性交流输电技术可灵活地控制和调节电力系统的运行状态;统一潮流控制器是ＦＡＣＴＳ的重要构成元件之一;为此着重介绍了含ＵＰＦＣ的电力系统潮流计算的数学模型和计算方法,并给出相应算例。     

潮流计算中FACTS元件模型选择研究

柔性交流输电系统（简称ＦＡＣＴＳ）元件的一个重要作用是调节电力系统的潮流分布,控制系统的运行状态。在稳态潮流分析中,选择恰当的模型来表示ＦＡＣＴＳ元件对计算收敛特性等非常重要。本文首先对ＦＡＣＴＳ元件现有的潮流计算模型作了比较充分的说明,讨论了其他可能采用的模型形式,分析了各种模型的优缺点,并采用这些模型分别实现了ＦＡＣＴＳ潮流计算,最后给出算例进行验证。     

灵活交流输电系统技术及其应用(二)

灵活交流输电系统技术及其应用（二）陈淮金（河海大学，南京）（续上期）４统一潮流控制器（ＵＰＦＣ）前述几种ＦＡＣＴＳ装置，如ＴＣＳＣ、ＴＣＰＳ、ＳＶＣ等，其功能是单一的。如ＴＣＳＣ仅控制线路的阻抗，ＴＣＰＳ仅控制线路的功率角，而ＳＶＣ只能通过控制所发无...     

UPFC最优布点问题研究

ＵＰＦＣ元件作为一种功能强大的ＦＡＣＴＳ器件正日益受到广泛的研究和重视,并有望在未来几年内投入实际运行。对应用中首先会面临的问题－安装地点问题研究时,在限定ＵＰＦＣ个数的情况下,以总容量成本最小为目标,通过目标潮流寻求电力网络中的最优环路集,并以其中的最佳连支作为ＵＰＦＣ的最佳安装地点。     

统一潮流控制器：FACTS装置的最新发展

本文简要介绍了ＵＰＦＣ的是而分析其对潮流的控制作用和对暂态稳定的控制作用,并与其它的ＦＡＣＴＳ装置的性能进行了比较,结果说明ＵＰＦＣ是最为理想的ＦＡＣＴＳ装置。     

UPFC最优布点问题研究

ＵＰＦＣ元件作为一种功能强大的ＦＡＣＴＳ器件正日益受到广泛的研究和重视,并有望在未来几年内投入实际运行,就其在应用中首先面临的问题即安装地点问题进行研究,在限定ＵＰＦＣ个数的情况下,以总容量成本最小为目标,通过目标潮流寻求电力网络中的最优环路集,并以其中的最佳连支作ＵＰＦＣ的最佳安装地点。     

统一潮流控制器功率控制特性的分析

统一潮流控制器（ＵＰＦＣ）控制规律的求取是ＵＰＦＣ装置实现其功能的关键,而研究ＵＰＦＣ的功率特性是解决ＵＰＦＣ控制问题的前提,为此建立了含ＵＰＦＣ的电力系统稳态模型,通过合理地选取控制变量,将状态方程线性化,分析了ＵＰＦＣ的功率控制特性和多个ＵＰＦＣ功率特性间的相互影响程度。通过实际潮流计算结果与线化后所得结果的比较,表明ＵＰＦＣ对电力系统的作用是趋于线性的。     

大型发电机组调速器的非线性最优PSS

提出了一种大型水电站调速系统的非线性最优电力系统稳定器(PSS)的原理和技术.该技术的关键是采用了状态-动态-测量(SDM)的反馈方法.计算机仿真和动模实验证明,利用该方法推导出的水电站调速系统非线性最优PSS(GNOPSS)控制规律能够显著提高远距离输电系统的安全稳定性,其效能价格比远超过多种FACTS设备,且与FACTS设备的效果是叠加的,不发生矛盾.该研究成果同样适用于大型火电机组的汽门开度调节系统.     

基于FACTS的现货市场阻塞解决方法研究

在电力市场环境下,利用柔性交流输电系统FACTS(FlexibleACTransmissionSystem)设备解决网络阻塞问题,获取更大的经济效益已经越来越引起人们的重视。提出基于FACTS的现货市场阻塞解决方法。从安全域的角度分析了引入FACTS控制作用解决阻塞问题的机理,建立了含FACTS控制作用的潮流和最优潮流模型,并用算例进行了分析。研究结果表明,FACTS的控制作用可以有效地解决网络传输阻塞问题,降低购电成本,避免由于网络输电阻塞引起节点电价的震荡。     

基于相对增益矩阵和 Prony 技术的南方电网FACTS 和 HVDC 之间交互影响分析

高压直流输电(HVDC)及灵活交流输电(FACTS)装置因其优良特性被广泛应用于现代电网中,但是其实际应用时间较短,加之其控制器的复杂性,使得对大规模交直流混联电网中 FACTS 装置之间及 FACTS 装置与 HVDC 间的交互作用的研究不够成熟和完善.文中以定量分析南方电网中FACTS 装置之间以及 FACTS 装置与 HVDC 系统间的交互作用大小为目标,建立了含 FACTS 装置和 HVDC 系统的多机电力系统的线性化模型,并详细阐述了引入不同 FACTS装置及直流系统时,控制变量、输出变量的选择及对代数方程的处理.接着对南方电网进行等值,利用该线性化模型推导出等值系统的传递函数,利用 RGA 方法找出 FACTS 装置之间以及 FACTS 装置与 HVDC 系统间的交互作用的大小.最后通过大扰动下的 Prony 分析验证了 RGA 分析结果的正确性.     

基于WAMS的FACTS元件最佳投入时刻的计算方法

系统故障后灵活交流输电系统(FACTS)元件可能会退出运行,其重新投入对系统的稳定性影响很大,且不同的投入时刻影响不同。分析了FACTS元件最佳投入时刻机理,基于扩展等面积法则(EEAC)构造了计算FACTS元件在系统故障后最佳投入时刻的两机系统暂态动能函数,提出了一种基于广域同步测量系统(WAMS)测量值的FACTS元件最佳投入时刻计算方法。最后,以静止同步补偿器(STATCOM)为例,通过PSCAD/EMTDC平台搭建了四机两区域系统模型,仿真结果表明,FACTS元件在最佳时刻投入能有效平息发电机功角摇摆和联络线功率的振荡,提高系统稳定性。     

Power flow control approach to power systems with embedded FACTS devices

This paper focuses on developing an approach to steady-state power flow control of flexible AC transmission systems (FACTS) device-equipped power systems. Based on a power-injection model of FACTS devices and an optimal power flow model, a novel versatile power flow control approach is formulated, which is capable of implementing power flow control incorporating any FACTS device flexibly. Different from existing FACTS device control approaches, the active and (or) reactive power injections are taken as independent control variables. Therefore, using this method, Jacobian matrix need not be changed, although various FACTS devices possess different physical models and different control parameters. Furthermore, it enables the integration of FACTS devices into the existing power system analysis and control programs efficiently. Physical limits of the FACTS devices are also considered in the model. Numerical results on a reduced practical system and a 1500-bus practical system with various FACTS devices are presented to illustrate the vigorousness of the proposed approach.     

Intelligent optimal sieving method for FACTS device control in multi-machine systems

A multi-target oriented optimal control strategy for FACTS devices installed in multi-machine power systems is presented in this paper, which is named the intelligent optimal sieving control (IOSC) method. This new method divides the FACTS device output region into several parts and selects one typical value from each part, which is called output candidate. Then, an intelligent optimal sieve is constructed, which predicts the impacts of each output candidate on a power system and sieves out an optimal output from all of the candidates. The artificial neural network technologies and fuzzy methods are applied to build the intelligent sieve. Finally, the real control signal of FACTS devices is calculated according to the selected optimal output through inverse system method. Simulation has been done on a three-machine power system and the results show that the proposed IOSC controller can effectively attenuate system oscillations and enhance the power system transient stability.     

Loadability enhancement with FACTS devices using gravitational search algorithm

In the present work, GSA (gravitational search algorithm) based optimization algorithm is applied for the optimal allocation of FACTS devices in transmission system. IEEE 30 & IEEE 57 test bus systems are taken as standards. Both active and reactive loading of the power system is considered and the effect of FACTS devices on the power transfer capacity of the individual generator is investigated. The proposed approach of planning of reactive power sources with the FACTS devices is compared with other globally accepted techniques like GA (Genetic Algorithm), Differential Evolution (DE), and PSO (Particle Swarm Optimization). From the results obtained, it is observed that incorporating FACTS devices, loadability of the power system increases considerably and each generator present in the system is being able to dispatch significant amount of active power under different increasing loading conditions where the steam flow rate is maintained corresponding to the base active loading condition. The active power loss & operating cost also reduces by significant margin with FACTS devices at each loading condition and GSA based planning approach of reactive power sources with FACTS devices found to be the best among all the methods discussed in terms of reducing active power loss and total operating cost of the system under all active and reactive loading situations.     

Power flow control and power flow studies for systems with FACTSdevices

In this paper, the modeling of flexible AC transmission system (FACTS) devices for power flow studies and the role of that modeling in the study of FACTS devices for power flow control are discussed. FACTS devices are solid-state power converters that have the capability of control of various electrical parameters in transmission circuits. A number of power flow study programs were developed in order to model various types of FACTS devices. Three main generic types of FACTS devices are suggested and the integration of those devices into power flow studies, studies relating to wheeling and interchange power flow control are illustrated     

具有串联电压源的FACTS暂态稳定数字仿真

本文提出一种用动态数字仿真研究柔性交流输电系统（ＦＡＣＴＳ）稳定性的模型。为了适应ＦＡＣＴＳ设备对电力系统暂态过程的快速作用，本文采用微分方程与代数方程联立求解法求解。算例系统的计算结果表明，所提出的模型和算法是正确而有效的，为研究ＦＡＣＴＳ的暂态稳定性和控制作用提供了有效工具。     

Modal synthesis of regulators for an electrical power system on the basis of FACTS devices

A method for the modal synthesis of the control of an electrical power system with FACTS devices is considered. The control is intended for damping the variation of power flow. The method uses the transformation of the equations of the linear model of an electrical power system to a diagonal form. Based on these transformations, a connectivity matrix is constructed and equations for synthesizing the transfer function of the regulator of an electrical power system on the basis of FACTS devices are derived. The regulator ensures the required degree of damping of variations in power flow.