配电网无功补偿技术的研究和应用

发布时间：2018-04-04 14:09

本文选题：配电网　切入点：无功补偿　出处：《华北电力大学》2014年硕士论文

【摘要】：对配电网进行无功补偿是配电网安全经济运行的重要条件,关系到用户是否能够得到安全、优质的电能。但是,长期以来我国大部分配电网存在无功容量不足的问题,不仅会造成巨大的损耗,还会威胁系统的安全稳定运行。所以,对配电网无功补偿技术的研究对配电网的安全运行和提高电网经济效益都具有重要的意义。配电网无功补偿研究主要有两方面内容：无功补偿优化理论的研究和无功补偿装置的研究。根据一定的配置原则和优化原则对无功功率补偿的方式和容量进行优化配置,能够有效降低系统损耗,提高配电网的电能质量。目前常用的无功补偿装置有并联电容器、静止无功补偿器和静止同步补偿器,根据应用场合和经济性分析可以选择合适的无功补偿装置对配电网进行补偿。本文首先对无功补偿基本理论进行了研究,包括无功补偿的原理和无功补偿对配电网的影响分析,并详细研究无功补偿的优化配置理论。其次,对常用的无功补偿装置的的工作原理和控制方法进行了研究,包括并联电容器、静止无功补偿器和静止同步补偿器。最后,对基于模块化多电平换流器(Modular Multilevel Converter, MMC)的STATCOM进行了研究,包括MMC的工作原理和调制策略、MMC-STATCOM的直流侧控制策略和交流侧控制策略,并在PSCAD/EMTDC环境下搭建了MMC-STATCOM仿真模型,对研究的控制策略进行验证。
[Abstract]:Reactive power compensation is an important condition for safe and economical operation of distribution network, which is related to whether users can get safe and high quality electric energy.However, for a long time, most distribution networks in China have the problem of insufficient reactive power capacity, which will not only cause huge losses, but also threaten the safe and stable operation of the system.Therefore, the research on reactive power compensation technology of distribution network is of great significance to the safe operation of distribution network and the improvement of economic benefits of distribution network.There are two main aspects in the research of reactive power compensation in distribution network: the optimization theory of reactive power compensation and the research of reactive power compensator.According to certain collocation principle and optimization principle, the way and capacity of reactive power compensation can be optimized, which can effectively reduce the system loss and improve the power quality of the distribution network.The commonly used reactive power compensators are shunt capacitors, static var compensators and static synchronous compensators. According to the application situation and economic analysis, appropriate reactive power compensators can be selected to compensate the distribution network.In this paper, the basic theory of reactive power compensation is studied, including the principle of reactive power compensation and the influence of reactive power compensation on distribution network, and the optimal allocation theory of reactive power compensation is studied in detail.Secondly, the working principle and control method of common reactive power compensator are studied, including shunt capacitor, static var compensator and static synchronous compensator.Finally, the STATCOM based on modular multilevel converter Modular Multilevel converter (MMC) is studied, including the working principle and modulation strategy of MMC, DC side control strategy and AC side control strategy of MMC-STATCOM, and the MMC-STATCOM simulation model is built in PSCAD/EMTDC environment.The control strategy is verified.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761.12

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