柔性电力技术论文基于柔性电力技术抑制电力系统次同步振荡研究

1、柔性电力技术论文：基于柔性电力技术抑制电力系统次同步振荡研究【中文摘要】近年来伴随着经济的快速增加,电力负荷持续增加,但是我国能源与负荷分布的不平衡决定了必须采取大容量、远距离、超高压输电。为提高经济效益、增强线路的稳定极限、解决我国现有输电线路输送容量低的问题,串联电容补偿工程逐渐增多,但是串联补偿会给系统带来次同步振荡问题,因此研究次同步振荡问题具有很强的现实意义和理论意义。柔性电力技术是伴随着电力电子技术以及工业水平的提高提出的概念,该技术中FACTS装置的应用,为电力系统次同步振荡抑制提供了又一个强有力的工具。本文在研究了次同步振荡研究中需要考虑轴系模型的原因、轴系的扭振特性以及次同步

2、振荡发生的机理,在此基础上采用SVC和STATCOM抑制电网的次同步振荡问题。SVC作为一种无功补偿元件,在我国电网使用非常广泛,主要是利用其实现电压控制等目标,但是利用SVC抑制次同步振荡的相关研究比较少。本文在研究了SVC的构成、工作原理以及利用SVC缓解SSO研究成果基础上,提出利用发电机端转速偏差信号,控制安装在线路中点位置的SVC,以实现抑制次同步振荡的。利用PSCAD/EMTDC对控制效果进行仿真,验证了该方法的可行性。鉴于SVC在国内电网的广泛应用,技术成熟,利用SVC实现对次同步振荡的抑制,具有很强的现实意义。STATCOM装置是近年来出现的全控型器件,与SVC相比较具有控制范

3、围宽、灵活性强等诸多优点。本文在研究了STATCOM基本原理及国内外采用STATCOM抑制次同步振荡问题研究成果基础上,提出了以发电机端加速信号为反馈信号,采用电流解耦控制技术,控制安装在线路中点位置的STATCOM装置,缓解系统的次同步振荡的抑制方案。以IEEE第二标准测试模型为研究对象,通过MATLAB/Simulink软件仿真,验证了该控制策略的正确性和可行性。【英文摘要】With the development of economy in recent years, the load of power system increase rapidly, but the distribut

4、ion of energy and load imbalance decided to take high-capacity, long distance and ultra-high voltage transmission. In order to improve economic efficiency and enhance the stability limit line to address the capacity of existing transmission lines besides to resolve the problem of low transmission, s

5、eries compensation project gradually increased, but the series compensation system will bring sub-synchronous oscillation, so the research problem with SSO Strong practical and theoretical significance.Flexible power technology is accompanied by the developing of power electronics technology and the

6、 industry improves. The applications of FACTS devices in this technology, provides a power tool for damping of SSO.Based on study the mechanism of SSO, damping of SSO by SVC and STATCOM is presented in this paper.SVC as a reactive power compensation component is widely used in Chinas power grid, mai

7、nly using the voltage control of its target, but the research of using SVC to damping SSO is few. In this paper, the basic operation principle of the SVC and the various control strategies are all introduced in detail. Use of generator speed error signal to control SVC that installed in the middle p

8、oint of the circuit is proposed to achieve the objective of damping SSO. The simulation results simulated in PSCAD/EMTDC verified this method is feasibility. Because the technology SVC is mature, so use SVC to damping SSO has strong theoretical and practical significance.STATCOM is a fully controlle

9、d device that based on GTO. Compared with SVC, STATCOM has many advantages, such as wider control range. Based on the principle of STATCOM and the research results of damping SSO with STATCOM Present using remote generator speed acceleration signal by STATCOM which located at the middle of transport lines controlled with decoupled current control method. The simulation results simulated in MATLAB/Simulink on IEEE SBM verified this method is feasibility.