Design Of Power Quality Surveillance

Electric power is one of product who is using in large scope, high value and more quantity in modern society. As the development of science skill, the elements which cause the power quantity have increased continuously. The problem that making the electric equipment can't be supplied electricity is the problem of power quality, which affects human life and the running of GDP's safe directly.Definition and categories of power quality(PQ) are discussed firstly.Depending on the national standards about PQ,the measurement principles and computing methods of all technology indexes on PQ are summarized,which supplies theory and arithmetic for the design and implementation of PQ monitors and analyzing equipment.It is a new type of PQ equipment based on graphical user interface.The main user interface of the software is the layout of the distribution network, which improves the alternating capability between the user and computer.It adopts the advanced data signal processing(DSP) and computer technology.In this paper,some key technologies in the design and their solutions are disscused and analyzed.The software function modules,such as data acquisition,data processing,human-machine interface and data management,are introduced.The crucial software design concepts of using multithread and double buffers for exchanging data are emphasized,so as to real time monitor,record and analyze indexes of power quality.The test result indicates that the design of power quality monitoring and analyzing equipment is correct,it operates stably and has a high precision.The equipment has such abilities as long-term operating,recording,real-time measuring and analyzing,managing of history data,etc.Compared with the traditional analyzer,there are many advantages,such as more function,easy controlling,strong processing and graphics output,etc.It is able to record the abundant and integrated data for the electric department,and provide the reference for selecting correct compensation technology.