厂站直流电源分层分布式监控系统

Hierarchical and distributed monitoring system for DC power of power plant and substation

针对中小型发电厂和变电站的直流系统,提出一种分层分布式监控方案,采用现地监控单元、现地监控中心和远方监控中心3层监控模式.现地监控单元按功能划分成多个分布式模块板,各模块板以增强型单片机为核心,形成开放式体系结构;现地监控中心采用可扩展多通信接口、高性价比的可编程序控制器(PLC)搭载触摸屏构成.各级间采用Modbus规约通过RS485接口进行通信.

A monitoring scheme based on the hierarchical and distributed structure is put forward for the DC power system of the small and medium power plant and substation. It takes the three layers monitoring modes, the local monitoring unit, the local monitoring center and the remote monitoring center. The local monitoring unit is divided into some distributed module boards by function, each module board employs enhanced MCU as the control core, and it has an open architecture. The local monitoring center is composed of a touch screen and a high cost performance programmable logic controller （PLC） which could extend multi -communication interfaces. Three monitoring layers communicate with each other using Modbus protocol and RS485 interface.