UPFC提高电力系统电压稳定控制研究

发布时间：2018-01-14 23:09

本文关键词：UPFC提高电力系统电压稳定控制研究　出处：《东南大学》2016年硕士论文　论文类型：学位论文

【摘要】：电力系统的电压稳定性问题一直受到世界各国电力工作者的关注,如何提高电力系统的电压稳定性的问题也一直是电力研究人员的研究对象。当灵活交流输电技术出现后,世界各地的工作人员对其进行了大量的研究,UPFC作为现有最具代表性的FACTS设备也越来越受到人们的关注。JPFC具备快速灵活的无功功率控制能力,动态地支撑接入点的电压,对防止电压失稳有十分重要作用,因此研究如何使用UPFC提高电力系统的电压稳定性,具有重要意义。本文主要针对UPFC提高系统电压稳定的控制策略进行研究,具体内容如下：(1)阐述UPFC的结构、工作原理、控制特性和工作方式,针对全国首个UPFC工程——南京UPFC工程中UPFC并联侧换流变压器接在燕子矶变电站低压母线上的特殊结构,提出了一种UPFC三节点功率注入模型,采用注入功率法,将UPFC并联侧功率注入低压母线,推导了UPFC三节点功率注入模型的数学表达式,并利用电力系统综合程序(PSASP)的用户自定义模型(UD)功能,搭建了其用于系统级分析的稳态模型与动态模型,通过仿真验证了其正确性与有效性。(2)对UPFC四种常见的控制方式：定功率控制,移相调节控制,阻抗补偿控制,电压调节控制进行了研究,通过在PSASP中进行大量的仿真计算,总结每种控制方式下控制目标以及控制器参数与系统电压稳定的关系,最后对UPFC常见的四种控制方式提高系统电压稳定的能力进行了比较,结果表明阻抗补偿控制对提高系统电压稳定最为有利。(3)针对小扰动故障,对UP FC定功率控制进行了改进,提出了改进定功率控制；针对大扰动故障,在改进定功率控制的基础上,提出了一种基于控制模式切换的电压稳定控制策略。该电压稳定控制策略旨在实现UPFC潮流调节功能的同时,提高系统电压稳定性。分别在三机九节点系统和南京西环网中对UPFC电压稳定控制策略的有效性与正确性进行了验证,与采用定功率控制的UPFC进行对比,结果表明,采用该电压稳定控制策略的UPFC对系统的电压稳定性更为有利,并且能够达到与定功率控制一样的有功潮流调节能力。
[Abstract]:The problem of voltage stability of power system has been concerned by power workers all over the world. How to improve the voltage stability of power system has been the research object of power researchers. After the emergence of flexible AC transmission technology, workers all over the world have done a lot of research on it. As the most representative of the existing FACTS devices, UPFC has attracted more and more attention. JPFC has fast and flexible reactive power control ability to support the voltage of the access point dynamically. It is very important to prevent voltage instability, so how to use UPFC to improve the voltage stability of power system is studied. This paper mainly focuses on the UPFC control strategy to improve the voltage stability of the system. The specific contents are as follows: 1) expatiate the structure, working principle, control characteristics and working mode of UPFC. Aiming at the special structure of the UPFC parallel side converter transformer connected to the low voltage busbar of Yanziji substation in Nanjing UPFC project, the first UPFC project in China. A three-node power injection model for UPFC is proposed. The UPFC parallel side power is injected into the low-voltage bus by using the injection power method, and the mathematical expression of the three-node power injection model for UPFC is derived. Using the function of user defined model (UD) of power system synthesis program (PSASP), the steady and dynamic models for system level analysis are built. The correctness and validity of this method are verified by simulation. (2) four common control methods of UPFC are studied: constant power control, phase shift control, impedance compensation control and voltage regulation control. Through a lot of simulation calculation in PSASP, the control target and the relationship between the controller parameters and the voltage stability of the system under each control mode are summarized. Finally, four common control methods of UPFC are compared to improve the voltage stability of the system. The results show that impedance compensation control is the most favorable to improve the voltage stability of the system. The fixed power control of up FC is improved, and the improved constant power control is put forward. For the large disturbance fault, the fixed power control is improved. A voltage stability control strategy based on control mode switching is proposed. The voltage stability control strategy aims to realize the UPFC power flow regulation function at the same time. The effectiveness and correctness of UPFC voltage stability control strategy are verified in three-machine nine-node system and Nanjing West Ring Network respectively. Compared with the UPFC with constant power control, the results show that the UPFC with this voltage stability control strategy is more favorable to the voltage stability of the system. And it can achieve the same active power flow regulation ability as constant power control.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM712

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