在对模拟信号进行信号采集处理时,需要利用模数转换器(Analog to Digital Converter,ADC)将模拟信号变为易于处理的数字信号。而ADC参数指标的好坏将直接影响整个系统的性能。评估ADC参数指标好坏的一个重要指标是ADC的有效位数(Effecti...在对模拟信号进行信号采集处理时,需要利用模数转换器(Analog to Digital Converter,ADC)将模拟信号变为易于处理的数字信号。而ADC参数指标的好坏将直接影响整个系统的性能。评估ADC参数指标好坏的一个重要指标是ADC的有效位数(Effective Number of Bits,ENOB)。对此,通过添加Hanning窗、数据预处理及快速傅里叶变换(Fast Fourier Transform,FFT)移位等方式来防止频谱泄露,提高测量精度;利用MATLAB进行ADC有效位数理论仿真验证,并将经过验证的方法应用到实际工程中。展开更多
This paper proposes the design and development of a novel, portable and low-cost intelligent electronic device (IED) for real-time monitoring of high frequency phenomena in CENELEC PLC band. A high speed floating-poin...This paper proposes the design and development of a novel, portable and low-cost intelligent electronic device (IED) for real-time monitoring of high frequency phenomena in CENELEC PLC band. A high speed floating-point digital signal processor (DSP) along with 4 MSPS analog-to-digital converter (ADC) is used to develop the intelligent electronic device. An optimized algorithm to process the analog signal in real-time and to extract the meaningful result using signal processing techniques has been implemented on the device. A laboratory environment has setup with all the necessary equipment including the development of the load model to evaluate the performance of the IED. Smart meter and concentrator is also connected to the low voltage (LV) network to monitor the PLC communication using the IED. The device has been tested in the laboratory and it has produced very promising results for time domain as well as frequency domain analysis. Those results imply that the IED is fully capable of monitoring high frequency disturbances in CENELEC PLC band.展开更多
文摘在对模拟信号进行信号采集处理时,需要利用模数转换器(Analog to Digital Converter,ADC)将模拟信号变为易于处理的数字信号。而ADC参数指标的好坏将直接影响整个系统的性能。评估ADC参数指标好坏的一个重要指标是ADC的有效位数(Effective Number of Bits,ENOB)。对此,通过添加Hanning窗、数据预处理及快速傅里叶变换(Fast Fourier Transform,FFT)移位等方式来防止频谱泄露,提高测量精度;利用MATLAB进行ADC有效位数理论仿真验证,并将经过验证的方法应用到实际工程中。
文摘This paper proposes the design and development of a novel, portable and low-cost intelligent electronic device (IED) for real-time monitoring of high frequency phenomena in CENELEC PLC band. A high speed floating-point digital signal processor (DSP) along with 4 MSPS analog-to-digital converter (ADC) is used to develop the intelligent electronic device. An optimized algorithm to process the analog signal in real-time and to extract the meaningful result using signal processing techniques has been implemented on the device. A laboratory environment has setup with all the necessary equipment including the development of the load model to evaluate the performance of the IED. Smart meter and concentrator is also connected to the low voltage (LV) network to monitor the PLC communication using the IED. The device has been tested in the laboratory and it has produced very promising results for time domain as well as frequency domain analysis. Those results imply that the IED is fully capable of monitoring high frequency disturbances in CENELEC PLC band.
