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The establishment of membership function in synthetic evaluation of power quality is taken to discussion. This paper proposes an improved membership function for power quality fuzzy synthetic evaluation. First, the weight of power quality indicators and the confirmation of indicator limit of membership function as well as the division of quality level are deeply analyzed. Then, on the basic of evaluation...
This paper presents an algorithm of new fuzzy membership function for power quality evaluation. Firstly, the six membership functions are presented in this paper to show the main characters as well as the differences. Then, the six functions are applied in the power quality evaluation in Gl method. Thirdly, a new fuzzy membership functions is constructed through weighting and combining six common...
Based on the research subject of harmonic pollution of Nanhai in Foshan, a harmonics survey in Nanhai gird is presented in this paper, on which a large number of statistical analysis have been worked. This survey takes almost a year and includes 490 enterprises, 772 distribution transformers at 12 towns. According to inspecting results, it shows that the harmonic pollution in Nanhai city is more severe...
In order to evaluate power quality more accurately, this paper presents a three-layer distributed online power quality monitoring system (PQMS), which uses the General Packet Radio Service (GPRS) wireless network as its communication channel. This PQMS consists of three parts: the power quality monitor (PQM), the monitoring software (MS) in upper computer and the web platform (WP). The PQM which is...
By means of the mathematical morphology (MM) method, the power quality (PQ) disturbance signals can be monitored quickly and effective. However, the signal under investigation is often corrupted by noises, and the MM filter formed by fixed structure elements of can not handle this very well. In this paper, the theory and shortage of traditional MM theory are analyzed at first. And an improved MM (IMM)...
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