There is an increasing interest in studying the power quality issues. It is sustained by different distorting consumers' operation within the power systems. Their operation affects the supplied power quality within the network, having, in several cases, negative effects for the rest of the consumers. The paper aims to analyze a major power quality issue: large scale consumers' harmonic evaluation, within a specific Romanian Power System region. Solutions for improving the current situation are provided and the numerical simulations are validated using specialized software. The power quality measurements, performed on the field, according to the regulations, have been confronted with the ones obtained using the computer-aided analysis. The conclusions sustained additional studies and analyzes for several operating conditions and scenarios.

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The paper is focusing on Particle Swarm Optimization (PSO) algorithm. Several variants of the PSO algorithm are studied. To evaluate their performances a software tool has been developed in Matlab environment. Three reference mathematical test functions have been used for this purpose. This paper represents a necessary step requested by the optimal power flow (OPF) computing approach. Currently the authors are focusing on developing a PSO based OPF computing algorithm. The most suitable PSO algorithm variant is provided based on the analyses within the current paper. Index Terms--particle swarm optimization, unified version, optimal power flow, mathematical test functions.

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