DSP-based distribution network PT ferromagnetic resonance suppression device monitoring and research

This article through to three kind of distribution network neutral point grounding mode were analyzed, and points out its operation characteristics and the existing problems of the grounding way. In neutral point grounded system, the electromagnetic voltage transformer (PT) of ferroresonance overvoltage is one of the most, the most common accident caused internal overvoltage, and seriously affects the safe operation of the distribution network. Through the analysis of the distribution network PT ferromagnetic resonance mechanism, points out measures to eliminate and suppress resonance is commonly used. Because of the traditional type computer harmonic elimination device is generally adopt 8-bit or 16-bit single chip processor, cannot satisfy the needs of the development of modern power grid. Based on traditional microprocessor based, on the basis of harmonic elimination device, designed a kind of power distribution network based on DSP PT ferromagnetic resonance monitoring and inhibit integration of protection device. The core of the device is to use the 32-bit DSP chip TMS320F2812 of TI company, by combining DSP algorithm, design of its hardware and software, and simulation studies are carried out using MATLAB/Simulink. Compared with other harmonic elimination device, this paper designs a new PT ferromagnetic resonance suppression device based on DSP has simple structure, cheap, comprehensive functions, high reliability, has a good application prospect in the power system.