Intelligent Power Quality Analyzer

摘要

The latest studies, concerning power quality problem, discussed in some prodigious international conferences, follow three main directions: 1. quality indicators analysis, surveying program realization and quality evaluation systems development; 2. evaluating the negative effects due to exceeding the limits imposed by international standards; 3. elaborating efficient technical, managerial, contractual and juridical measures, in order to insure keeping the indicators values between the limits provided by standards. Power systems analysis is very difficult due to network complexity growth and due to the simultaneous presence of some regimes, which can be considered as disturbances. The first step of modern three-phase power networks adaptive and intelligent control consists in developing accurate models of input signals. The following step is to establish the appropriate correlation between the input signal parameters and the acquisition hardware in order to perform valid interpretation of data sets (that is to identify accurately specific disturbances as harmonics and inter-harmonics). We can identify two major approaches to do so: numerical and spectral methods. The final step denotes the decision stage in order to compensate the negative effects of identified disturbances. This paper describes the design process of hardware and software primitives in order to implement an intelligent power quality analyzer, able to control the acquisition hardware to perform coherent sampling and to compute specific network state parameters.