Research And Implementation Of Multifunction Power Meter Based On BF531

In recent years, with the development of social progress and national economic, People's demand for electricity and power quality have become increasingly demanding, there has been an increasingly tight power supply situation. Based on the current actual situation, regardless of the power management or power users there is a pressing need for a safe, reliable, real-time fast, feature-rich electric power meter, effectively testing and electrical parameters of power quality monitoring and analysis.With rapid development of digital signal processing technology, it has brought new changes in electric parameters measurement, especially in the power system of high voltage and current harmonic measurement and analysis, the application of electrical parameter monitor is increasingly becoming the latest trends in research and development. The system introduce the basic idea of use the DSP techniques to measure the electrical parameters, using a hardware genlock technology to achieve simultaneous sampling. In this paper, from the hardware circuit structure and operating principle, to software design introduces of multi-function power meter.In this paper, ADI's Blackfin series BF531 of DSP as a data collection and processing chip, and STM32F103 ARM chip peripheral module expansion as the overall design of the program. On the hardware side: High-performance DSP processor to obtain the AD73360's sampled data to realize three-phase voltage, three-phase current, active power, reactive power, apparent power, active power, reactive power, apparent power, as well as frequency and power factor, etc electric parameter measurement; Complete the FFT transform, realize high-order harmonic's measurement and analysis in the power system. ARM processor external of FRAM FM24C32, real-time clock chip M41T83 can guarantees data is not lost on power-down and provides real-time time for the system ; Display module using high-resolution LCD screen, so that shows better; The communication interface of RS-485's MODBUS protocol can be easy to achieve the data exchange between PC and achieve intelligent meter reading; The amount of input and output switches using opto isolation, effectively reduce the interference, simplifying the circuit design, improve performance and reliability. On the software side: Mainly within the system of communication procedures and a variety of electrical parameters of the algorithm, etc.; Host machine interface using LABVIEW software programming, achieve electric meter remote monitoring.In addition, this system also two aspects of hardware and software design to increase the system's interference. Through practical testing show that this device has good real-time, high reliability, high accuracy, man-machine interface is friendly, scalable, etc., have a very wide application prospect and practical value.