基于DSP的电能质量参数高速采集系统

摘要

To solve the problem that the traditional power quality parameter acquisition system' s slow processing speed, low precision, this paper designed a high-speed power quality parameter acquisition system based on fixed-point DSP chip ADSP -BF548 and high-precision A/D conversion chip AD7656. The system used the phase-lock frequency multiplication technology to a-chieve synchronous sampling,and the data converted by AD7656 was collected by the DSP through EPPI in the DMA mode. The actual grid frequency achieves high-precision measurement by the use of DSP's general-purpose timer working in capture mode. Tests show that the system has high precision, hihg data processing speed and good real-time capability.%针对传统的电能质量参数采集系统处理速度慢、精度低等问题,设计了基于定点DSP芯片ADSP - BF548和高精度模数转换芯片AD7656的电能质量参数高速采集系统.系统采用锁相倍频技术实现同步采样,DSP通过增强型并行外围接口( EPPI)以DMA的方式对AD7656的转换数据进行16位高速并行采集.同时运用DSP芯片通用定时器的“捕捉”工作模式,实现对电网频率的测量.测试表明,该系统精度高,数据处理速度快,具有很高的实时性.