摘要
针对并网逆变器功率控制中电流的高精度反馈及其故障监测中实时电流检测的需求,提出了一种基于Sigma-Delta ADC技术的逆变器并网电流采集和快速过流检测方法。该方法利用两个抽取速率不同的Sinc3滤波器分别对经滤波处理后的调制数据流进行解调,实现了对同一调制数据流的灵活使用,数据流由二阶ΣΔ调制器调制产生,Sinc3滤波器均在数字信号处理器(DSP)内部实现。测试结果表明所提方法实现了逆变器并网电流的13位有效位数的高精度隔离采样和3.4μs的快速过流检测。
In order to meet the requirements of high-precision current feedback in power control and real-time current detection in fault monitoring of grid-connected inverters, a new method of grid-connected inverter current acquisition and rapid overcurrent detection based on Sigma-Delta ADC technology was proposed. In this method, two Sinc3 filters with different extraction rates were used to demodulate the filtered data stream respectively, which achieved the flexible usage of the modulation on the same data flow. The data stream was modulated by a second order sigma delta modulator, Sinc3 filters were implemented in the digital signal processor(DSP). Test results show that the proposed method realizes the inverter grid current 13 effective resolution bit isolation sampling and 3.4 μs rapid over-current detection.
作者
梁文科
苏淑靖
梁东飞
邢震震
Liang Wenke;Su Shujing;Liang Dongfei;Xing Zhenzhen(Key Laboratory of Instrumentation Science and Dynamic Measurement,Ministry of Education,North University of China,Taiyuan 030051,China)
出处
《电子测量技术》
北大核心
2021年第13期11-16,共6页
Electronic Measurement Technology
基金
国家自然科学基金(51875534)项目资助。
