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This paper deals with the modelling and analysis of a shunt active power filter by the use of a MATLAB/Simulink program. The modelling approach adopted in the paper is graphical in nature, as opposed to mathematical models embedded in code using a high-level computer language. The model is presented clearly and in a detailed manner, targetted especially at postgraduate students. The performance of the active power filter is illustrated by considering a 400kV A, six-pulse, fully controlled bridge rectifier supplied from a typical distribution system via a rectifier transformer. [ABSTRACT FROM AUTHOR]