The study on harmonic measure algorithm in electric power system based on DSC

For the previous harmonic measurement devices are complexity on the external circuit in the power system, this paper introduces a new harmonic measurement design which has a small volume, low power consumption, good reliability and cost-effective. This device puts DSC (digital signal controller) as the core system hardware and puts FFT (fast Fourier transform) algorithm as primarily system software. The system is mainly divided into data acquisition parts, data processing parts, man-machine interface parts and so on. The system can quickly detect the power grid three-phase voltages and three-phase current harmonic in the grid, so the device can meet the requirements of real-time and high precision. The correctness and high-speed of the algorithm is verified by experiments and field operation.