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华中区域电网低频振荡分析及控制的研究
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摘要
本文是结合华中电网实际工程建设的需要而进行研究的科研课题项目而完成的。为有效利用电力资源,实现“西电东送”的战略目标,促进全国联网。目前国家电网公司充分利用已投运的二滩电站送出工程和部分在建的三峡输变电工程,建立了“川电东送”的临时通道。但由于四川二滩电厂输电至华中的路径长,属于区域性大电网交流弱联,会导致华中与川渝两网500KV线路联网后稳定问题极为突出,亦会有产生低频振荡的可能性。
     由于本文研究目标非常明确,实际应用意义大,所要研究的内容多,所涉及的知识点和面广,具有很多学术研究价值。根据电网的实际情况和课题项目要求,本文进行了较为系统深入的研究。
     文中针对两网的具体情况,阐述了发生低频振荡的可能性并进行了相关计算,并简要介绍了抑制低频振荡的措施。
     全文共分七章。第一章论述了本文课题研究的目的和意义并简单介绍了低频振荡的危害与研究的必要性和重要性;第二章介绍华中电网与川渝电网的概况,并分析了目前网络自身存在的问题;第三章主要进行了低频振荡的机理分析,给出了进行潮流和低频振荡计算所相关的数学模型;第四章介绍了曾经发生过的低频振荡事例和现象,并进行了潮流、暂态稳定计算以及系统受干扰后稳定性能分析;第五章进行了两网联网后低频振荡计算及分析,并找出了可能产生低频振荡的位置;第六章简要介绍了低频振荡的抑制方案和基于电力电子装置抑制措施;第七章总结了全文所做的工作并给出了展望和进一步研究的思路。
This dissertation combines the engineering needs of the Central China Grid and the scientific research subject is accomplished. In order to effectively use the power resource and realize the strategy objective of "west-east electricity transmission", so that promotes the networking in whole nation. At present, the State Grid corporation of China has fully used the sending power project of two-beach power stations which is running and the three gorges transmitting and transforming electricity project which is being build and has built the temporal channel of "Sichuan-east electricity transmission". Because the transmitting electric power of Sichuan electricity to Central China Grid is long, belonging to the AC weak link of big electrical network, can lead to the stabilizing problem extremely outstand that electrical wire of Central China Grid and Sichuan-chongqing Grid 500KV, also has the possibility of low frequency oscillation.
    This dissertation has clear studying objective and the real application meaning is big, and has many studied contents, and the knowledge point and area, which involves is wide, and possesses a lot of systematic research value. According to the real circumstances and the subject item requirement of electrical network, this paper has gone into deep and systemic research.
    According to the concrete circumstances of the two grids, this dissertation has expounded possibility that occurs the low frequency oscillation and has done the related calculation, and briefing restrains the measure of low frequency oscillation has been put forward.
    The dissertation has seven chapters. In chapter 1, we introduce the purpose and meaning of this subject study and has simple introduced the harm of the low frequency oscillation and the necessity and importance to research; in chapter 2,we introduce the general situation of Central China Grid and Sichuan-chongqing Grid and analyses the problem that the network self existing at present; in chapter 3, we mainly carry on the mechanism analysis to the low frequency oscillation, and have given out the mathematical models which carry on the calculation of trend and the low frequency oscillation; in chapter 4,we introduce low frequency oscillation examples that occurred once and carry
    
    
    though the trend counts and transient state stable counts and the stability can be analyzed after the system is disturbed; in chapter 5,we have carried on the low frequency oscillation counts and analyzes behind the two linked nets and find out the locations that probably giving rise to the low frequency oscillation; 6, we brief introduce the restraining scheme to the low frequency oscillation and the restraining measure based on the power electronic device; in chapter 7,we conclude the work of the paper and prospect the future and the train of thought studied further.
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