POWER FLOW CONTROL OF POWER SYSTEMS BY THYRISTOR-CONTROLLED SERIES CAPACITOR

可控串联电容器(TCSC)作为柔性交流输电系统(FACTS)控制器的一种，有望更好地利用现有输电设施，如灵活控制潮流、改善稳定性、提高输电能力等。然而，对TCSC的操作经验还很少，因此，对TCSC的操作和特点仍有待进一步了解。本文主要围绕以下两个方面展开研究：(1)提高TCSC的稳定性；(2)在开放接入环境下，实现TCSC最大限度地利用输电资源的优化运行。该学习系统是一台单机连接到无限大系统的学习系统。可控串补控制与…等现有电力系统控制器的相互作用更多信息已被调查。结果表明，在没有TCSC和AVR协调控制的情况下，系统的减振效果较好。研究表明，对于不对称线路故障，可控串补三相触发角的单独控制是有效的。讨论了TCSC电路中附加电阻对稳定的影响。(2)将粒子群算法应用于潮流控制，以最大限度地接受所请求的轮式功率。为促进发电竞争和用户选择，开放输电网络。当多个PPS请求同时向用户供电时，期望传输网络接受尽可能多的请求功率。通过使用TCSC控制潮流，可以最大限度地提高总请求功率。本文提出了一种基于粒子群算法的可控串补最优电抗确定算法。在6节点和IEEE 30节点系统模型上验证了该方法的有效性。较少

The thyristor-controlled series capacitors (TCSC), one of the FACTS (Flexible AC Transmission Systems) controllers, are expected to provide better use of existing transmission facilities, such as flexible control of power flow, stability improvement, and an increase of power transfer capability. However, there has been little operating experience and thus further understanding of the operation and characteristics of TCSC is still to be sought. This study focuses on the following two subjects : (1) stability improvement and (2) optimal operation of TCSC for maximum use of transmission under open access era.Results obtained in this study are summarized as follows :(1) Power system stabilization by TCSC.Simulation using TCSC mathematical model have been conducted on power system stabilization by controlling the firing angle of TCSC. The study system is a one-machine connected to an infinite-bus system. Interaction between TCSC control and the existing power system controller such as AVR h … More as been investigated. It was found that without coordinate control of TCSC and AVR there has been less damping in the system. It has been made clear that individual control of three-phase firing angles of TCSC is effective for unsymmetrical line faults. Effects of additional resistor to TCSC circuit upon stabilization have been also discussed.(2) Application of PSO to power flow control for maximum acceptance of requested wheeled power.Open access to power transmission networks has been carried out to foster generation competition and customer choice. When several PPSs request to simultaneously supply power to customers, it is expected that transmission network accepts as much requested power as possible. It is possible to maximize total requested power by controlling power flow using TCSC. In this study, an algorithm based on Particle Swarm Optimization (PSO) has been proposed to determine the optimal reactance of TCSC. The validity of the proposed method has been checked successfully for 6 and IEEE 30 bus system models. Less