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Hybrid Power System Power Flow Analysis

Energy and Power Engineering 2013年第4期5卷 698-702页

作者： Petr Bilik jakub manas Jan Zidek Jiri Koziorek Faculty of Electrical Engineering and Computer Science VSB-Technical University of Ostrava Czech Republic

Hybrid power supply system consists of a number of independent and different sources of electrical energy with different operating times during different seasons and with energy storage system. Deployment of a hybrid power system is expected in places outside the normal distribution network. For the further research and improvements it is necessary to know in detail the power flow from various sources to the load or to storage battery depending on different seasons. The paper presents data analysis results computed by application developed for detailed analysis of power flows within hybrid power system. Developed application analyses the data from the monitoring system. Data has been acquired and recorded within last year. This data is visualized as power flows in the individual hybrid power system circuits. Together with electrical power the effectiveness and performance parameters of rectifier and DC/AC converter are evaluated. The paper describes achieved results and needs for further improvements of such solution.

关键词： Hybrid Power Systems Data Analysis Application Software

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The Use of LMS and RLS Adaptive Algorithms for an Adaptive Control Method of Active Power Filter

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Energy and Power Engineering 2013年第4期5卷 1126-1133页

作者： Radek Martinek Jan Zidek Petr Bilik jakub manas Jiri Koziorek Zhaosheng Teng He Wen College of Electrical and Information Engineering Hunan University Changsha Hunan Province China Faculty of Electrical Engineering and Computer Science VSB – Technical University of Ostrava Czech Republic

This paper deals with the adaptive control mechanism management meant for shunt active power filters (SAPF). Systems driven this way are designed to improve the quality of electric power (power quality) in industrial networks. The authors have focused on the implementation of two basic representatives of adaptive algorithms, first, the algorithm with a stochastic LMS (least mean square) gradient adaptation and then an algorithm with recursive RLS (recursive least square) optimal adaptation. The system examined by the authors can be used for non-linear loads for appliances with rapid fluctuations of the reactive and active power consumption. The proposed system adaptively reduces distortion, falls (dip) and changes in a supply voltage (flicker). Real signals for measurement were obtained at a sophisticated, three-phase experimental workplace. The results of executed experiments indicate that, with use of the certain adaptive algorithms, the examined AHC system shows very good dynamics, resulting in a much faster transition during the AHC connection-disconnection or during a change in harmonic load on the network. The actual experiments are evaluated from several points of view, mainly according to a time convergence (convergence time) and mistakes in a stable state error (steady state error) of the investigated adaptive algorithms and finally as a total harmonic distortion (THD). The article presents a comparison of the most frequently used adaptive algorithms.

关键词： Active Power Filters Total Harmonic Distortion Least Mean Square Adaptive Filtering Recursive Least Square

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