SVC和STATCOM比较及其在西电东送线路应用

SVC和STATCOM都是常见的FACTS装置,具有良好的动态无功补偿能力。本文对其多种性能指标进行了比较,然后选取南方电网西电东送线路中装设有SVC或STATCOM的变电站,仿真研究在SVC或STATCOM装设前后变电站的稳态电压调控和故障电压变化。结果证明,这两种FACTS装置均有助于调节变电站母线电压,并增强了故障下的电压支撑能力,明显改善了西电东送线路的电压水平。     

含无功补偿装置的风电并网系统暂态电压稳定性研究

针对大规模风电并网后系统的暂态电压稳定性问题,阐述了暂态电压失稳的机理以及暂态电压稳定性的分析计算方法,介绍了2种重要的无功补偿装置SVC和STATCOM。采用BPA软件对国内某一实际电网进行了仿真分析,结果表明,风速变化和系统发生短路故障均会对系统的暂态电压稳定性造成影响,导致系统的电压水平降低。装设SVC或STATCOM对系统电压均有支撑作用,且STATCOM对电压的支撑作用更加明显。     

基于动态补偿器的电力系统电压稳定和暂态稳定分析

随着我国电网向大机组、大电网、高电压和远距离输电发展,电力系统的稳定问题变得日益突出。为改善系统电压稳定和故障后系统的暂态稳定性,将两种动态补偿装置--静止无功补偿器(SVC)和静止同步补偿器(STATCOM)应用于电力系统中,以实时动态方式向系统提供无功补偿。利用MATLAB/SIMULINK平台建立了补偿系统仿真模型,验证了SVC、STATCOM对维持电力系统稳定性的作用,并对两者进行了比较,指出STATCOM具有更广阔的应用前景。     

STATCOM与SVC提高大型异步机风电场LVRT能力对比研究

研究了STATCOM与SVC提高大型异步机风电场低电压穿越(LVRT)能力的效果。分析了恒速异步风力发电机LVRT能力低的原因以及STATCOM与SVC提高其LVRT能力的作用机理。在PSCAD/EMTDC中分别搭建了STATCOM、SVC控制模型和含异步机风电场的IEEE14节点电网的仿真模型,通过仿真实验验证了这两种无功补偿装置对于提高异步机风电场LVRT能力的重要作用。仿真实验结果表明:STATCOM与SVC均能够帮助风电场在电网故障后快速重建电压,降低电网同步发电机励磁电压峰值和强励时间,抑制发电机转子加速,使异步风力发电机组穿越低电压故障区域。STATCOM比SVC有更好的补偿稳定性,提高异步机风电场LVRT能力更突出。     

SVC与STATCOM在大容量输电通道上的应用比较

静止无功补偿器( SVC) 和静止同步补偿器( STATCOM) 都是无功补偿的重要装置,在故障下的电压支撑、提高暂态稳定极限、阻尼功率振荡等方面对两者进行分析比较.仿真指出在输电通道上安装大容量无功补偿装置,单个节点上安装SVC和STATCOM对维持节点电压的能力一般,STATCOM好于SVC;在提高暂稳极限方面,STATCOM的效果好于SVC;在增强系统阻尼效果上,同容量的STATCOM明显优于SVC,同调节范围时两者阻尼控制效果基本一致;STATCOM响应速度高于SVC,但响应速度对控制效果影响不大.     

考虑快速动态无功补偿的二级电压控制

提出了一套考虑快速动态无功补偿装置(如静止无功补偿器/静止同步补偿器(SVC/STATCOM))的二级电压控制体系,致力于在稳态电压控制和暂态电压稳定中充分发挥SVC/STATCOM快速动态无功补偿的优势,其包含两个相对解耦独立的控制阶段:第1阶段将SVC/STATCOM与传统无功调节设备统一纳入协调二级电压控制模型,充分利用SVC/STATCOM的快速调节特性,并防止反调;第2阶段建立二次规划模型进行动态无功储备的优化控制,利用慢速动态无功补偿装置置换出SVC/STATCOM的无功功率,提高电网动态无功储备水平。通过时序和空间上的相互协调,充分发挥各类无功补偿装置在二级电压控制和暂态电压稳定预防控制中的作用。Nordic系统的算例测试结果证明,该体系能够有效提高传统二级电压控制的响应速度,避免SVC/STATCOM与传统电压控制装置间的反调现象;同时,能够有效地进行暂态电压稳定的预防控制,提高扰动后的系统电压的恢复效果。     

SVC与STATCOM在大容量输电通道上的应用比较

静止无功补偿器( SVC) 和静止同步补偿器( STATCOM) 都是无功补偿的重要装置,在故障下的电压支撑、提高暂态稳定极限、阻尼功率振荡等方面对两者进行分析比较。仿真指出在输电通道上安装大容量无功补偿装置,单个节点上安装SVC和STATCOM对维持节点电压的能力一般,STATCOM好于SVC;在提高暂稳极限方面,STATCOM的效果好于SVC;在增强系统阻尼效果上,同容量的STATCOM明显优于SVC,同调节范围时两者阻尼控制效果基本一致;STATCOM响应速度高于SVC,但响应速度对控制效果影响不大。     

SVC与STATCOM联合运行协调控制设计与仿真

针对静止无功补偿器（SVC）装置无法抑制电压闪变的缺点,提出了一种新型SVC与静止同步补偿器（STATCOM）构成的混杂装置以及基于模糊预测的联合运行方案,即利用小容量STATCOM抑制闪变配合大容量SVC补偿无功。对于抑制电压不平衡问题,探索了SVC分相控制的实现方法和效果。对含有混杂装置的单机无穷大系统的仿真结果验证了协调控制策略的有效性以及不平衡控制方法的正确性。     

对比研究链式STATCOM与SVC对电网的暂态支撑能力

大型互联电网若缺乏充足的动态无功支撑将面临严重暂态电压失稳现象,在输电系统的关键位置安装快速可控的无功补偿装置将有效抑制这一现象.重点研究了电网故障下动态无功补偿装置SVC和链式STATCOM的暂态电压支撑能力以及暂稳极限提高能力.针对链式STATCOM的独特结构,提出了一种改进分相控制策略.基于Matlab/Simulink搭建了系统仿真模型,仿真结果证实故障下链式STATCOM的暂态电压支撑能力略高于SVC,暂稳极限提升能力明显优于SVC,同时验证了改进分相控制策略可确保不对称故障期间链式STATCOM对系统的暂态支撑作用正常发挥.     

STATCOM与SVC在电力系统运行中的比较分析

静止无功补偿器（SVC）和静止同步补偿器（STATCOM）是2种常见的新型柔性交流技术装置,在输出特性、对提高输电系统稳定性、响应时间、谐波分析、经济性等方面对STATCOM和SVC进行了比较,并通过仿真得出了STATCOM较SVC具有响应速度快,控制方法先进、电流谐波含量少、经济性好等优点。     

基于不同失稳机理的动态无功补偿装置的配置

从输电网功角失稳和配电网电压失稳的不同机理出发,对动态无功补偿装置在输、配电网络中不同配置进行了探索性的分析.对于输电网,根据系统失稳时临界割集处电压降低幅度大的特点,提出在输电网的临界割集或附近安装STATCOM装置,其原因在于STATCOM装置受端电压变化影响小,在功角失稳前电压降得很低时仍能提供较大感性无功功率;...     

FACTS对多机系统静态电压稳定性的影响

针对一个两区域薄弱互连的4机系统,利用负荷裕度指标和P－U曲线平坦度指标,衡量了FACTS设备对系统静态电压稳定性的影响。连续潮流法潮流计算结果表明SVC,STATCOM,TCSC等3种FACTS设备都可以在不同程度上改善系统的静态电压稳定性,改善的效果与设备参数的选取有关。对于所研究的4机系统,为了提高系统的静态电压稳定性,装设TCSC进行串联补偿可以取得比装设SVC,STATCOM进行并联补偿更好的效果。     

矿热炉混合无功补偿系统优化协调控制研究

为解决矿热炉给电网中其他用户带来的电能质量问题,尤其是电压跌落和电压闪变,提出了一种由FC、SVC和STATCOM组成的混合无功补偿系统。其中FC负责低层低成本无功补偿;SVC负责跟踪补偿无功功率变化,改善三相不平衡;STATCOM则通过快速响应来补偿SVC由于响应速度慢而导致的补偿误差,从而提高整个混合补偿系统的补偿精度。三者通过系统规则判断进行协调控制。对混合无功补偿系统进行仿真试验,分析对比了系统投入前后的电压波形,证明其补偿效果等效于等容量的STATCOM。     

基于PSCAD的风电场低电压穿越无功支撑仿真研究

首先分析风电场低电压穿越(low voltage ride-through,LVRT)能力,然后介绍以双馈感应发电机(doubly-fed induction generator,DFIG)为主体的风电场模型以及静止同步补偿器(static synchronous compensator,STATCOM)的控制策略。最后将STATCOM和静止无功补偿器(static var compensator,SVC)分别应用到含风电场的无穷大系统中,在电力系统仿真软件PSCAD上搭建模型,并对系统故障状态进行仿真,在此基础上分析STATCOM和SVC的无功补偿特性,并对补偿效果进行比较。仿真结果表明无功补偿装置可以在系统故障后提供无功支撑,提高了风电场的低电压穿越能力,并且STATCOM无功补偿性能较SVC更优。     

Voltage stability boundary and margin enhancement with FACTS and HVDC

Voltage stability is a major concern of today’s power system, especially under heavily loaded conditions because of reactive power limits. FACTs devices are very effective solution to prevent voltage instability and voltage collapse due to fast and very flexible control. In this paper, the impacts of SVC, STATCOM, TCSC and HVDC on voltage stability boundary (VSB) in P–Q plane have been studied. The bus impedance matrix and load flow results are used to find the voltage stability boundary. The Z_bus is modified to take into account the effect of FACTS on VSB. The variable susceptance model for SVC and variable series impedance power flow model for TCSC are used in Newton Raphson’s method. The STATCOM is modelled as variable voltage source connected in series with an equivalent impedance of the shunt connected transformer. Similarly HVDC is also modelled as two STATCOMs connected at each end of the line one as rectifier and another as inverter. Some important bus and line stability indices are evaluated to determine the most effective location for SVC/STATCOM and TCSC/HVDC respectively in order to achieve the maximum enhancement of voltage stability margin. The study has been carried out on IEEE-14 bus and IEEE-30 bus test systems using MATLAB programming. A comprehensive study is done to compare the effectiveness of FACTS devices and HVDC on voltage stability margins.     

A new modeling and placement of shunt FACTS devices in the secondary voltage regulation environment

Recently, the Secondary Voltage Regulation (SVR) is installed in some power systems in order to ensure the coordination voltage control devices. In other hand, the shunt FACTS devices such as the Static Var Compensator (SVC) and the STATic COMpensator (STATCOM) are extensively used for the local voltage control without any coordination with other voltage control devices, without any reciprocal coordination. In this paper, new models of SVC and STATCOM are proposed to be adopted in power flow models that include the SVR. The proposed models are implemented and tested on a model of the Italian power system. Furthermore, a new method based on sensitivity analysis is proposed to find the most sensitive placements for the installation of SVC and STATCOM. The results obtained show the highly computational performance of the propose models and also the effectiveness of the sensitivity analysis to find the best placements of SVC and STATCOM taking into account the SVR.     

应用于风电场的STATCOM的仿真研究

在Matlab中的动态仿真工具Simulink建立了与无穷大系统相连的2机风电场模型。对该系统在三相短路故障时进行了仿真并分析了STATCOM的补偿特性。仿真结果表明：与SVC相比,STATCOM能更好的提高风电场的暂态稳定性,保持风电场连续运行。     

Instability of a static var compensator control system and its investigation based on the bifurcation theory

This paper deals with the instability of a static var compensator (SVC) control system, which compensates the reactive power of loads using measurements of voltage and reactive power of the loads. The SVC control system is characterized by its meeting a bifurcation point and its instability before the loads reach the so-called nose point. This is proved by an investigation based on the bifurcation theory, and is also supported by stimulation studies of a power system. Motivated by the bifurcation theoretical investigation, an SVC control system using a reference voltage pattern is proposed which does not create such instability.     

STATCOM/SVC impact on the performance of transmission line distance protection

The impact of 48‐pulse STATCOM/SVC on the apparent impedance seen by the transmission line distance relay is investigated in this paper. Analytical results are presented and verified by detailed simulations. The STATCOM/SVC control systems are modeled in full details and practical constraints are applied. It is shown that the presence of a current limiter in the control system of STATCOM could significantly mitigate the impact of STATCOM on the relay's calculated apparent impedance. Six different phase‐to‐phase and phase‐to‐ground measuring units of the distance relay are simulated to resemble the behavior of the relay. It is shown that the impact of SVC on the apparent impedance seen by the phase‐to‐ground fault measuring units is more pronounced. Different power system operating conditions, STATCOM/SVC control system settings and fault scenarios are considered in the simulations. The STATCOM/SVC effects on the distance relay tripping characteristics are also analyzed. © 2011 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.