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Study on the Networked Integrated Monitoring System for Power Quality

Author: ZhouYanJing
Tutor: WangMingYu
School: Chongqing University
Course: Electrical Engineering
Keywords: Power Quality Neural Network FFT Virtual Instrument Network
CLC: TM933.4
Type: Master's thesis
Year: 2009
Downloads: 144
Quote: 3
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Abstract


Along with the swift development of power industry, the problem of power quality is increasingly outstanding. Improving power quality and ensuring the safety of the whole grid is the common desire for both the supplier and the user. We can understand the reason and the impact clearly when the power quality is monitored and analyzed effectively. Then, we can promote power industry develop harmoniously. Monitoring also can provide basis for dividing the responsibility between the supplier and the user.Monitoring devices of power quality which are used in our country have many disadvantages, such as single function, small capacity, bad expansibility, uneasy network, and so on. Some measurement algorithms are also needed improvement. According to the disadvantage of traditional devices, this paper has two parts job. The one is exploring the new algorithm for harmonics measurement. The other is constructing the networked integrated monitoring system for power quality.Application of neural network to analysis of harmonics is the one of the focus direction. This paper proposed a new method which utilizes the two spectral lines interpolation algorithm to obtain the frequency of fundamental signal and uses neural network model based on the fixed triangle to analysis harmonics. The new method has been tested that it can obtain the amplitudes and phases precisely at one time by simulation. It is more intuitive and has higher convergent speed. In addition, a new neural network model based on triangle base function with alterable parameters is constructed by self-defined neural network function in Matlab. Combining this model with windowed fast Fourier transform (FFT) algorithm and LM training algorithm can reach to the accurate analysis for integer harmonics and non-integer harmonics. In the end, simulation results verify the validity and feasibility of the algorithm. It provides a new method for the analysis of power system’s non-integer harmonics.Making use of the great advantages of LabVIEW in graphical develop environment, signal analysis and network communication, this paper develop a networked integrated monitoring system for power quality. It can satisfy the requirement of monitoring five steady targets. It has alarming, storage and display functions. It also has a lively man-machine interface. In this paper, the author proposed the mode of the remote data storage based on the LabSQL module and database technology and the information publishing scheme based on the B/S mode and Remote Panels technology. User can inquire the data of power quality through internet. In other words, it can realize information share lightly. The experiment results showed that this system can monitor and analysis power quality effectively.

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CLC: > Industrial Technology > Electrotechnical > Electrical measurement techniques and instruments > Power the number of measurements and instrumentation > Power measurement,power meter
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