变电站电压无功控制实现方式探讨及改进

在变电站电压无功综合自动控制（VQC）中，主要有以下几种实现方式：自带I＼O系统的VQC、利用自动化系统后台监控系统的VQC实现方式、自动化系统网络VQC以及半独监的VQC实现方式．根据现场实际运行情况，对各种方式进行了仔细分析和研究；指出了它们的优缺点和现存的主要问题．在此基础上，提出了一种改进的VQC实现方案，和现有的几种实现方式相比，它具有闭锁可靠性岛、速度快等特点．

Implementation Mode and Its Improvement of VQC in Substations

In the field of VQC,there are several implementation modes currently,including the indepen-dent VQC with their own I/O system,the mode based on the monitoring system of automation system,the mode based on computer net of automation system,and the half-independent VQC.The modes of VQC are compared and analysed according to the operational situation in substations.The advantages,drawbacks and the main technical problems are pointed out.On the basis of it,a new mode of VQC is presented.Compared with the modes applied in power networks in China,its blocking is more reliable and faster.