基于ARM的中频发电机组电气输出信号模拟装置设计

Design of ARM-Based Signal Generator Simulating Medium Frequency Generator Sets

为提高中频电站监控装置调试的效率,降低调试运行成本,为中频电站监控装置出厂检验提供依据。设计了基于ARM重复中断定时器(Repetitive Interrupt Timer,RIT)的中频发电机组电气输出信号模拟装置,替代实际发电机组产生的交流电信号。该模拟装置通过ARM的通用输入输出口(General Purpose Input/Output,GPIO)输出400Hz的方波,再将方波转换成正弦波,用来精确模拟中频发电机组产生的电压、电流间的相位关系及波形。

The signal generator which replaces the medium frequency generator is developed to improve the efficiency, hence, reduce the costs of the test and adjustment of the medium-frequency power plant monitoring products. The signal generator u-ses repetitive interrupt timer of ARM processor to control the work flow and output a 400 Hz square wave via GPIO of the ARM processor. The square wave signal is transformed into sine wave afterwards. The final output can simulate the waveform and the phase relationship between the voltage and the current of real generator output.