【作者】 孙玮；

【导师】 王成山；

【作者基本信息】 天津大学 ， 电力系统及其自动化， 2007， 硕士

【摘要】 随着风力发电在世界范围内的迅速发展,越来越多的兆瓦级以上的大型风电场直接接入输电系统。在传统的风力发电研究中,仅仅限于小型风力机组对配电系统影响的研究,但是随着风力发电技术的飞速发展,特别是海上大型风电平台的建立,世界上总装机容量超过10000KW的大型风电场越来越多。未来几年内,将有越来越多的大型风电场直接连入输电系统,因此有关大型风电场并网的相关研究工作日益得到重视。同时,随着系统互联和电力市场的深入发展,电力系统可用输电能力(ATC)的研究越来越受到人们的关注。最大输电能力(TTC)的计算是整个ATC分析的基础和关键,也是当前研究的热点。因此,本文针对含有大型风电场的电力系统,对其静态电压稳定约束条件下的TTC计算进行研究。本文首先介绍了风能开发和风力发电的历史,并从风力机类型、风力机基本特性、风力机功率调节和风电并网的影响四个方面详细介绍了风力发电技术。针对传统包含风力发电机静态模型潮流算法的不足,本文使用完整的异步发电机π型等值电路进行推导,建立了含异步风电机组的统一迭代潮流计算模型和连续潮流(CPF)计算模型。利用接入风电场的IEEE118节点系统算例验证了该模型的可行性,并与传统PQ模型和RX模型进行比较,证明了该模型在保证计算精度的前提下大大提高了收敛速度。利用本文提出的含异步风电机组的统一迭代CPF计算模型,针对含有大型风电场的电力系统,对其静态电压稳定约束条件下的最大输电能力展开研究分析,研究了风速、风电穿透功率和机端补偿容量等因素对最大输电能力的影响。算例结果表明:在包含大型风电场的电力系统中,调度员在计算可用输电能力的时候必须考虑到风速的变化、风电穿透功率的增大和机端补偿容量的配置等因素对可用输电能力产生的影响。更多还原

【Abstract】 While wind power generation is developing rapidly all through the world, there are more and more megawatt wind farms being connected directly into power system. In the traditional research, it is always focused on the influence of small-scale wind turbines on distribution system. But while large-scale wind platforms at sea is established, there are more and more large-scale wind farms, whose total installed capacity is more than 10MW. In other words, in the near future, there are more and more large-scale wind farms being connected directly into power system. Therefore, the research of this connection is getting more attention.Meanwhile, in a new competitive environment, Available Transfer Capability (ATC) is a very important parameter for independent system operator (ISO) and all companies to participate in power transaction activities. The calculation of Total Transfer Capability (TTC) is the groundwork of ATC research. Therefore, a new methodology to evaluate TTC of power system, which contains large-scale wind farms, considering static voltage stability constraints is developed in this thesis and the following work are completed.Firstly, the exploitation of wind energy and history of wind power generation is introduced and the detail of this technology is presented in four aspects: styles of wind turbines (WT), basic characteristics of WT, power regulation of WT and the influence of connecting power system with WT.Secondly, to ameliorate the deficiency of traditional power flow arithmetic containing the static modle of WT, the uniformly iterative power flow calculation model and continuation power flow (CPF) calculation model of power system containing asynchronous wind power generators is established, by deducing integratedπ-type equivalent circuit of asynchronous generators. The feasibility of this new model is illustrated by an application to an IEEE RTS-118 system containing wind farms. By comparing with traditional PQ model and RX model, it is proved that this new method enhances the speed of constringency in precondition of guaranteeing the precision of calculation.Then, based on this presented uniformly iterative CPF calculation model containing asynchronous wind power generators, TTC of power system, which contains wind farms, considering static voltage stability constraints is calculated and analyzed. Moreover, the infection of wind speed, wind power penetration and wind turbine compensation capacity on TTC is investigated. It is indicated that, when calculating the ATC of power system containing large-scale wind farms, the operator should considering the influence of diversification of future wind speed, collocation of wind turbine compensation capacity and variation of wind power penetration on ATC.更多还原