ABSTRACT
The exact and quick detection of electric power parameters plays a key role in the
realization of the automation regulating of the electric power network, of the safe of electric
power, and of the economical operation of the whole power system. Through the analysis of
domestic and international developmental status quo of the monitoring device for electric
power parameters detection, and aiming at the requirements and the practical issues in
electricity sector of our country, and on the basis of setting up FFT algorithm based model of
electrical power parameters detection, the paper proposes a new type of multi-purpose electric
power monitor device.
The hardware design uses TI's TMS320C5402 as the core processor. According to data of
the power system collection and processing in the practice, by using dsp, the system can
complete the six channels Signal Converter through high speed AC converter AD73360; meet
the power system data acquisition in real-time and synchronization. CPLD and Sunplus MCU
implement partial control function, including keyboard, LCD interface, and the voice and
serial communications circuit.
To software the concerning software algorithms is designed. The system adopts 128
points sample and DSP to be responsible for 2-based FFT operation. Before the use of FFT
algorithm, FIR digital filter sector is used to effectively reduce interference and measurement
precision. The main program of electrical power parameters detection is also introduced. The
voice alert and more humanized operation interface is also realized.By the combination of two
advanced hardware and software technologies, which are including high-speed DSP chip and
the exact Fourier transforms, a DSP based electrical power parameters measurement system is
designed to improve measurement precision and guarantee the real-time operation.
This system implements synchronous sampling of three phase voltage and three current
signal of three phase electrical power network, and the real-time measurement of electric
power parameters of the detected electrical power network signal. Keyboard is used to select
electrical power network signal, the detected parameter. The result of measurement is
displayed in liquid crystal; the system can also give an alarm when the System is in trouble.
KEYWORDS:Electrical Power Parameters;FFT;TMS320C5402;CPLD;Synchronous