1、 摘要摘要 电压是电能质量的重要指标之一，网损是电力企业的一项重要综合性 技术经济指标。长期以来电力系统网络损耗问题比较突出，而无功补偿是 降低线损的有效手段。随着电力系统负荷的增加，对无功功率的需求也日 益增加。在电网中的适当位置装设无功补偿装置成为满足电网无功需求的 必要手段。 本文从无功补偿的现实意义出发，分析了无功补偿的必要性和经济效 益。简单介绍了目前无功补偿研究的现状，探讨无功补偿的原理并对主要 的几种无功补偿方式进行了简要的分析，给出本文设计用于并联电容器组 补偿方式的智能低压无功补偿装置的研究任务。装置采用 ATT7022A 检测 电网运行参数，减少了 CPU 运算量，提高电网
2、参数辨识的精度，并可以简 化系统软件设计。系统以 Atlmega64 处理器为控制核心，采用功率因数控 制和电压限制相结合的方式工作，并给出采用永磁真空开关在特定电压相 角投切电容器的方法，有效解决了电容器投切过程中在线路上产生涌流的 缺点，并设有多种保护措施，保护系统可靠、稳定运行。装置还设计了友 好的人机接口和通讯接口，使用方便。 关键词关键词：无功补偿、并连电容器、ATT7022A、Atlnega64 2 ABSTRACT Voltage is one of important quality index of electric power system. Power loss is a
3、n important synthesis technical and economic index of power companies. In the past several years, the problem of power loss is very serious. However, reactive compensation is an effective method to save power loss .Due to increasing loads of electric power system, demand of reactive power was also i
4、ncreasing. It became necessary means that reactive power compensation devices were installed in proper position of electric network. This thesis considers the significance of reactive Power compensation and analyses the indispensability and economic benefits of reactive Power compensation. The devel
5、opment status of reactive power compensation is briefly introduced. Principles of reactive power compensation are explained. Several primary reactive power compensation solutions are discussed. This thesis proposed an intelligent low voltage reactive compensation control scheme and implemented devic
6、e for shunt capacitor compensation. An ATT7022A is adopted to detect the power grid operation information to reduce the calculation volume of CPU and enhance the precision of power grid parameter identification. This also simplifies design work of the software. ATMEGA64 is utilized as the main process unit and method combining power factor control and voltage limitation is used as the system working mode. Specific voltage phase is determined to switching shunt capacitor via permanent
