| Power quality is the key to whether the normal operation of the power system, It have access to a large number of power electronics in the micro-grid, these elements will affect the quality of the micro-grid power, which determines whether the normal operation of the micro-grid. This article relies on the 110KW PV micro-grid project of Anhui Polytechnic University, designed power quality data collection, analysis and system protection switch modules based on TI’s TMS320F2812, to guarantee power quality in the micro-grid.Firstly, briefly introduce the background and trends of the micro-grid power quality data collection and research, then analyzes the necessity of micro-grid power quality data collected,for the current situation and the domestic power quality data acquisition device presents a suitable micro-grid power quality data acquisition system model analysis, and on this basis put forward by the on-off control of the inverter to respond to unexpected situations that may occur in the micro-grid. This paper briefly describes the power and quality of national standards and to learn these standard discrete calculation method and FFT algorithm for harmonic process and prepare a corresponding program. Then complete the design of the hardware circuit, the front end of a strong electric current collection system via the voltage sensor will be stronger electrical signal is converted to weak signals, and then after a weak signal converted by the signal conditioning circuit conditioning becomes AD chip can receive a range of and then it by the AD converter, the analog signals to digital signals evacuation carried out by the DSP processing to determine whether power quality control abnormal later IPM inverter module off, and design RS232 communication modules for DSP and improve data transmission reliability. Finally, a brief introduction of the software design process, complete data acquisition and analysis. Paper and summarize the work proposed direction for further research. |
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