基于非实时OS的毫秒级定时在LVRT测控系统中的实现

Implementation of millisecond timescale timing based on the non-real-time OS in LVRT measurement and control system

风电机组运行过程中,由于电网故障等原因,会出现瞬时电压跌落现象。本文研发了低电压穿越(LVRT)测控系统,监控测试风机的抗干扰性,提出一种在非实时系统中的高精度毫秒级定时方案,使用OS自带的定时函数嵌套调用实现精确定时的方法,解决了LVRT实时控制系统中高精度定时和资源占用率之间的矛盾,满足35kV/6MVA固定式电压跌落发生装置模拟电网的电压跌落与恢复精度,实现对电压跌落实时控制,同时实现了对电压跌落与恢复时风电机组运行状态的实时监测。该测控系统性能达到国际先进水平,已在风机电组低电压穿越测试中投入使用。

Because of power grid failure and other reasons, during the process of the Wind Generator operation, voltage dips phenomenon will appear. This paper develops LVRT measurement and control system, monitor anti-jamming of test fan, proposes a kind of non-real-time system to realize high precision timing scheme of voltage dips real-time monitoring, nested calls OS’s owning timing function, achieve precise timing, solved the contradiction between the occupancy rate and high-precision timing in LVRT non-real-time control system, realize the voltage dips situation of real-time monitoring, achieved higher precision, faster demand of LVRT ttc system monitoring 35kV / 6MVA fixed voltage dips happen device simulation grid voltage dips. The measurement and control system performance has reached the international advanced level, and put into use in low voltage electric group LVRT tests.