POWER QUALITY CONTROL IN THE POWER DISTRIBUTION NETWORKS

To establish a practical guide for the Power Quality (PQ) control represents the main aim of this paper. The reasons that impose the determination either of the main indicators or of the specific ones to a certain type of end-user or even of all PQ indicators are the following:- responsibilities establishment of the end-users, the equipment producers and the electrical power delivery units, regarding to the PQ non-providing;- emphasizing of the most adequate methods and resources, technically and economically justified, in order to provide and maintain the PQ in the analysed electrical network. A general and critical analysis referring to the analytical basics of the PQ indicators determination is presented, with the purpose of giving an impulsion to their correct determination. The measures that have to be taken in order to realise a professional harmonics analysis are substantiate on the discrete Fourier analysis particularities. The presentation of a complete vision over the symmetrical components calculus represents as well an important original contribution of the authors. The recommended measurement points are indicated on a general power distribution scheme. Further on, the concrete manner of the transducers connecting in order to acquire the voltages and currents systems, is presented related to the voltages and currents levels. Finally, the Virtual Instrumentation utilization in the PQ monitoring and control is argued