提高电力系统暂态稳定性的大型风电场低电压穿越技术研究

项目名称： 提高电力系统暂态稳定性的大型风电场低电压穿越技术研究

项目编号： No.51477115

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 姜惠兰

作者单位： 天津大学

项目金额： 72万元

中文摘要： 随着风电场装机容量的不断增加，风电场的运行对系统稳定性的影响不容忽视。大型风电场的低电压穿越会对电力系统暂态稳定性产生一定的影响，为了提高系统暂态稳定性，确保系统安全运行，需要研究含风电场的电力系统暂态稳定性分析方法，分析风电场低电压穿越与系统暂态稳定性的关系，以及穿越能力的不同对系统暂态稳定性的影响。基于等面积定则，从减小加速面积和增大减速面积的角度，按照低电压穿越的不同实现方式，研究提高电力系统暂态稳定性的风电场低电压穿越新技术方案。分析风机撬棒投入时间对系统暂态稳定的影响，研究改进型的撬棒电路以解决撬棒长时间投入对系统暂态稳定的危害；研究多风电场低电压穿越协调综合方案，避免风机撬棒的连锁投切对系统暂态稳定的不利影响；研究有效的控制策略提供功率支持，减少故障时电压降低的程度和故障切除后电压恢复的速度。所研究的低电压穿越新技术，在风电场穿越故障的同时能够提高电力系统的暂态稳定性。

中文关键词： 电力系统稳定；风力发电；分布式电源；风电并网

英文摘要： With wind power capacity enlarging constantly, the impact of wind operation towards power system stability is unignorable. Low voltage ride through for wind farms will have a certain influence on power system transient stability. In order to improve power system transient stability and ensure the system safe operation, it is needed to develop the approaches to analyze the transient stability of power system with wind farms, study the relationship between low voltage ride through and transient stability and analyze the impact of different ride through capability on transient stability. Based on equal area criteria, the new technique scheme of low voltage ride through for large wind farms which could facilitate power system transient stability will be developed from the aspect of reducing the acceleration area or increasing the deceleration area according to different modes of low voltage ride through. The project working includes: analyzing the impact of crowbar working time on power system transient stability and researching on improved crowbar circuit to reduce the impacts of crowbar long-time working on power system transient stability; researching on the comprehensive scheme to coordinate low voltage ride through among multi wind farms in order to avoid adverse effects of crowbar chained action on power system transient stability; researching on effective control strategies which can provide power support to decrease the voltage reduction level and recovery time. The new techniques proposed could ensure wind turbine riding through faults and improve power system transient stability at the same time.

英文关键词： power system stability;wind power generation;distributed generation;wind power integration