含TCSC电力系统暂态稳定分析
发布时间：2019-06-20 14:46
【摘要】：近年来,随着电力需求的增长,电网负荷强度提高,电力系统的暂态稳定问题日益突出,如何提高电力系统的暂态稳定性已成为一个急待解决的问题。为满足远距离大容量电力输送,以及新能源发电并网的要求,可控串联补偿器(ThyristorControlledSeries Compensation,简称TCSC)等基于电力电子技术的灵活交流输电(Flexible AC TransmissionSystem,简称FACTS)元件在电力系统中的应用日益增加,为电力系统暂态稳定分析提出了新的研究课题。TCSC是一种串联在交流输电线路中的阻抗补偿装置,它通过晶闸管快速控制来实现阻抗的大范围连续调节,是一种典型的串联型FACTS技术。利用TCSC可以提高功率输送能力、抑制功率振荡以及提高暂态稳定性等,为远距离输电提供了技术手段,已取得若干实际应用。在研究TCSC的动态行为及其对电力系统的影响方面,目前的主要方法包括时域仿真法和直接法,这两种方法均存在一些困难,如时域模型的准确建立、有效的仿真方法、能量函数的构造等都有待深入研究。本文的主要工作如下:(1)建立了含TCSC的电力系统数学模型,包括同步发电机模型、负荷静态模型、网络结构保留模型和TCSC控制模型。(2)针对单机无穷大系统及多机系统分别完成了含TCSC电力系统的潮流计算及时域仿真计算。(3)阐述了含TCSC的电力系统在网络结构保留模型下的能量函数构造。详细介绍了能量函数构造的方法与步骤,证明了 TCSC静态模型能量函数的单调下降特性。对考虑动态TCSC模型的单机及多机电力系统能量函数进行了运算,通过其导数的非正特性表明其能量构造的正确性。计算结果表明,TCSC能抑制系统振荡并提高系统暂态稳定性。本文提出的考虑TCSC静态特性的能量函数满足单调下降要求。考虑TCSC动态的能量函数法暂态稳定性分析仍需进一步研究。
[Abstract]:In recent years, with the increase of power demand and the increase of power grid load intensity, the transient stability of power system is becoming more and more prominent. How to improve the transient stability of power system has become an urgent problem to be solved. In order to meet the requirements of long distance and large capacity power transmission and grid connection of new energy generation, the application of flexible AC transmission (Flexible AC TransmissionSystem, (FACTS) elements based on power electronics technology, such as controllable series compensator (TCSC), is increasing day by day in power system, which puts forward a new research topic for transient stability analysis of power system. TCSC is a kind of impedance compensation device in series in AC transmission line. It realizes the continuous regulation of impedance in a wide range through the rapid control of thyristor, which is a typical series FACTS technology. The use of TCSC can improve the power transmission capacity, suppress the power oscillation and improve the transient stability, which provides a technical means for long-distance transmission, and has made some practical applications. In the study of the dynamic behavior of TCSC and its influence on power system, the main methods include time domain simulation method and direct method, both of which have some difficulties, such as the accurate establishment of time domain model, effective simulation method, the construction of energy function and so on. The main work of this paper is as follows: (1) the mathematical model of power system with TCSC is established, including synchronous generator model, load static model, network structure retention model and TCSC control model. (2) the power flow calculation and time domain simulation of power system with TCSC are completed for single machine infinite bus system and multi-machine system, respectively. (3) the energy function construction of power system with TCSC under network structure retention model is described. The method and steps of constructing energy function are introduced in detail, and the monotone decline characteristic of energy function of TCSC static model is proved. The energy function of single machine and multi-machine power system considering dynamic TCSC model is calculated, and the correctness of its energy structure is shown by the non-positive characteristics of its derivative. The calculation results show that TCSC can suppress the system oscillation and improve the transient stability of the system. In this paper, the energy function considering the static characteristics of TCSC meets the monotone decline requirement. The transient stability analysis of TCSC dynamic energy function method still needs to be further studied.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712
本文编号：2503300
[Abstract]:In recent years, with the increase of power demand and the increase of power grid load intensity, the transient stability of power system is becoming more and more prominent. How to improve the transient stability of power system has become an urgent problem to be solved. In order to meet the requirements of long distance and large capacity power transmission and grid connection of new energy generation, the application of flexible AC transmission (Flexible AC TransmissionSystem, (FACTS) elements based on power electronics technology, such as controllable series compensator (TCSC), is increasing day by day in power system, which puts forward a new research topic for transient stability analysis of power system. TCSC is a kind of impedance compensation device in series in AC transmission line. It realizes the continuous regulation of impedance in a wide range through the rapid control of thyristor, which is a typical series FACTS technology. The use of TCSC can improve the power transmission capacity, suppress the power oscillation and improve the transient stability, which provides a technical means for long-distance transmission, and has made some practical applications. In the study of the dynamic behavior of TCSC and its influence on power system, the main methods include time domain simulation method and direct method, both of which have some difficulties, such as the accurate establishment of time domain model, effective simulation method, the construction of energy function and so on. The main work of this paper is as follows: (1) the mathematical model of power system with TCSC is established, including synchronous generator model, load static model, network structure retention model and TCSC control model. (2) the power flow calculation and time domain simulation of power system with TCSC are completed for single machine infinite bus system and multi-machine system, respectively. (3) the energy function construction of power system with TCSC under network structure retention model is described. The method and steps of constructing energy function are introduced in detail, and the monotone decline characteristic of energy function of TCSC static model is proved. The energy function of single machine and multi-machine power system considering dynamic TCSC model is calculated, and the correctness of its energy structure is shown by the non-positive characteristics of its derivative. The calculation results show that TCSC can suppress the system oscillation and improve the transient stability of the system. In this paper, the energy function considering the static characteristics of TCSC meets the monotone decline requirement. The transient stability analysis of TCSC dynamic energy function method still needs to be further studied.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM712
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