柔性電力技術論文基于柔性電力技術抑制電力系統次同步振蕩研究

1、柔性電力技術論文：基于柔性電力技術抑制電力系統次同步振蕩研究【中文摘要】近年來伴隨著經濟的快速增加,電力負荷持續(xù)增加,但是我國能源與負荷分布的不平衡決定了必須采取大容量、遠距離、超高壓輸電。為提高經濟效益、增強線路的穩(wěn)定極限、解決我國現有輸電線路輸送容量低的問題,串聯電容補償工程逐漸增多,但是串聯補償會給系統帶來次同步振蕩問題,因此研究次同步振蕩問題具有很強的現實意義和理論意義。柔性電力技術是伴隨著電力電子技術以及工業(yè)水平的提高提出的概念,該技術中FACTS裝置的應用,為電力系統次同步振蕩抑制提供了又一個強有力的工具。本文在研究了次同步振蕩研究中需要考慮軸系模型的原因、軸系的扭振特性以及次同步

2、振蕩發(fā)生的機理,在此基礎上采用SVC和STATCOM抑制電網的次同步振蕩問題。SVC作為一種無功補償元件,在我國電網使用非常廣泛,主要是利用其實現電壓控制等目標,但是利用SVC抑制次同步振蕩的相關研究比較少。本文在研究了SVC的構成、工作原理以及利用SVC緩解SSO研究成果基礎上,提出利用發(fā)電機端轉速偏差信號,控制安裝在線路中點位置的SVC,以實現抑制次同步振蕩的。利用PSCAD/EMTDC對控制效果進行仿真,驗證了該方法的可行性。鑒于SVC在國內電網的廣泛應用,技術成熟,利用SVC實現對次同步振蕩的抑制,具有很強的現實意義。STATCOM裝置是近年來出現的全控型器件,與SVC相比較具有控制范

3、圍寬、靈活性強等諸多優(yōu)點。本文在研究了STATCOM基本原理及國內外采用STATCOM抑制次同步振蕩問題研究成果基礎上,提出了以發(fā)電機端加速信號為反饋信號,采用電流解耦控制技術,控制安裝在線路中點位置的STATCOM裝置,緩解系統的次同步振蕩的抑制方案。以IEEE第二標準測試模型為研究對象,通過MATLAB/Simulink軟件仿真,驗證了該控制策略的正確性和可行性?！居⑽恼縒ith 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.