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| 摘要: |
| 依据数据采集系统用于配电网中35/0.4 kV、10/0.4 kV箱式变电站中,可实现远方集中控制和监测的特点,设计了以80C196 KC单片机为核心的智能数据采集系统(简称数采系统)。数采系统由电压形成、前置模拟低通滤波器、多路开关、模/数(AD)转换及过零检测等模块组成。采用比较式数采系统,选用顺序采样、依次转换的采样方式,芯片为逐次逼进型AD MAX197;数采系统用交流采样,选用软件同步采样方式。为减小误差,系统设计了频率测量子程序,利用80C196 KC产生的高速中断测量电网周期,从而计算出采样间隔时间,保证精确采样。根据电网频率的变化修正定时器的中断常数实现电网周期的跟踪。试验结果表明,所设计的数据采集系统符合要求。 |
| 关键词: 数据采集系统,模/数变换器,软件同步采样 |
| DOI： |
| 分类号:TM764 |
| 基金项目: |
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| Intelligent data acquisition system for prefabricated substation |
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SUN Qiang ZHANG Jian-zhong
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| Abstract: |
| With 80C196 KC microprocessor as the core,an intelligent data acquisition system is designed for 35 / 0.4 kV and 10 / 0.4 kV prefabricated substations to realize remote centralized control and monitoring.The system consists of modules of voltage generation,front analog low-pass filter,multiplexer,analog-to-digital converter,zero-crossing detector.It is of comparative system,which adopts MAX197 working in sequent sampling and ordinal converting mode and AC sampling synchronized by software.To reduce the error,a subprogram for frequency measuring is developed.The high-speed interruption generated by 80C196 KC is used to measure the power frequency and the sampling interval is then calculated.The interruption constant of the timer is corrected according to the power frequency.Experiment results show that the designed system meets requirements. |
| Key words: data acquisition system,AD converter,software synchronous sampling |
