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采用“PLC+微机准同期装置”的方法实现了电站监控系统并网环节的设计。系统中PLC采用三菱公司的FX2N系列,利用内部程序逻辑控制,确保任何时候只输出一路通道选择信号,实现可靠选线控制。而微机准同期装置则可以精确地计算出导前时间,确保在零相位差点准确合闸。该系统因结构简单、功能完善、实现方便,适合在电站监控系统中进行推广。
Adopting the method of “PLC + Microcomputer synchronization device” to realize the design of grid connection of power station monitoring system. In the system PLC uses the Mitsubishi Corporation’s FX2N series, uses the internal procedure logic control, guarantees that only outputs the channel choice signal all the way at any time, realizes the reliable alignment control. The microcomputer quasi-synchronous device can accurately calculate the lead time to ensure that the zero phase difference accurately closing. The system is simple in structure, perfect in function and convenient in implementation, and is suitable for promotion in power plant monitoring system.