Research Design Of Power Quality Detection System Based On DSP

Electricity is valuable in modern society as a special commodity.Improving the efficiency of electricity is not only a key way to keep the national economy growth,but also an important factor to guarantee the safe operation of power grid.Now,the level of power quality has become an important symbol of the national,regional economic development.Except getting the technical support from the power electronics,the power quality deteriorates further.Therefore,it is necessary to monitor the power quality and assess the level of energy consumption.The power assessment will help us to understand the electricity efficiency,guarantee quality of supply,and ensure safe and stable operation of power network.The important conclusions and innovative achievements of this work are as following:Firstly,the thesis elaborates the related to power quality problems,including the power quality in our country faced with the gravity of the situation,the standardized question of the power quality are different in each country and promote the importance of power quality in our country.Assess the relevant indicators of power quality in multiple,this article will of frequency,harmonics and unbalanced three-phase voltage parameters are introduced,at the same time analyzed the current implementation the mainstream of power quality detection algorithms.Secondly,with TMS320F2812 as the core to develop the power quality monitoring system.This paper describes the system design and operating principle,and describes the system frame,hardware and software design exhaustively.Hardware design of the core is the grid signal data acquisition and signal data processing,data acquisition module USES the sensor and the signal conditioning circuit converts the grid signal into digital signal system can handle;The data processing module of the acquisition of digital signal by DSP chip high-speed accurate operation.Software design is mainly on the system control core TMS320F2812 chip,software programming,the module to complete the work includes:system initialization,grid signal analog-to-digital conversion and data analysis,and the upper machine communication and so on.The module not only interact with other modules,core components and it is the realization of FFT algorithm.Finally,the analysis of the whole power quality detection system for debugging and performance testing.Experimental test results show that the system software and hardware operation efficiency is good,can be properly the grid signal acquisition and analysis processing,has reached the expected target.In this thesis,design of power quality monitoring system not only can collect accurate signal to the power grid,the grid signal is converted into a reliable and effective digital signal,at the same time of power quality indexes(frequency,harmonic and unbalance degree)for real-time measurement,and can transfer to PC for further analysis.The system testing in a timely manner,evaluation method and reliable,has the very good practical application value.