Decision theory criteria for sizing cable and harmonic filters in distribution systems
Dept. of Electr. Eng., Naples Univ., ItalyDOI: 10.1109/UPEC.2004.192208 Conference: Universities Power Engineering Conference, 2004. UPEC 2004. 39th International, Volume: 1
Source: IEEE Xplore
Distribution system engineers have frequently to choose among different solutions under problem data uncertainty; in most cases related to modern distribution system components sizing, among the uncertainties, the ones deriving from the presence of static converters must be included. In these conditions, decision theory can offer efficient and valuable tools to choose the optimal solution. This paper refers to distribution electrical systems with static converters and considers three different approaches based on decision theory for the joint economical sizing of medium voltage cables and passive filters under uncertainty, properly accounting for harmonics due to non linear load presence. In the last part of the paper, the implementation and practical application of the sizing procedures are discussed and compared in a case study.
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ABSTRACT: This paper proposes an optimal design of single tuned shunt passive filter for the Underground Ramsis Metro Substation (URMS) using linear programming technique as a conventional technique and fuzzy linear programming (FLP) technique as a modern technique. The optimal filter parameters are obtained to overcome the harmonics generated in the voltage and current waveforms, due to the non-linear characteristics of the rectifiers, which distort the voltage and current waveforms at the point of common coupling (PCC). The harmonic levels are analyzed at different loading conditions using the fast Fourier transform (FFT) on MATLAB optimization program. The proposed optimal design of harmonic filter is based on minimizing the cost of the filter parameters and its losses. Both techniques are applied on the system under study. From the results, the THD levels of the line current and the bus voltage are reduced to be within the standard limits. A comparison between the optimal design filters is carried out using the LP and FLP techniques. However, the lowest cost of filter is obtained using the FLP technique.
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