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对低压电网的监控参数的自身特点进行理论分析,研究了谐波的来源与危害,在分析比较常用的谐波检测方法后,针对快速傅里叶变换算法存在的频谱泄露等问题进行了改进,通过增加低通滤波器和锁相倍频电路来改善计算谐波频率、相位和幅值的准确度。然后采用了TMS320F2812作为核心处理器,并利用ADS8364这一款六路模拟输入、16位并行输出的模数转换器进行数据采集转换,详细设计了低压电网监控系统的硬件电路。包括信号传感电路、信号调理电路、数据处理电路及通信电路等。最后系统考虑了抗干扰的要求,在电路中接入了相关的保护电路。
After analyzing the commonly used harmonic detection methods, this paper improves the existing problems such as the spectrum leakage of FFT algorithm, and analyzes the characteristics of the monitoring parameters of LV network. Improve the accuracy of calculating harmonic frequencies, phases and amplitudes by adding low-pass filters and phase-locked multiplication circuits. And then use the TMS320F2812 as the core processor, and use ADS8364 this a six analog inputs, 16 parallel output analog-digital converter for data acquisition and conversion, a detailed design of the low-voltage power supply network monitoring system hardware. Including signal sensing circuit, signal conditioning circuits, data processing circuits and communication circuits. Finally, the system considered the anti-jamming requirements, the circuit connected to the relevant protection circuit.