Single 23062015 Session 2 Devgon P Single phase L oad S ymmetrising A ctive F ilter D esign Supervisor Dr Adri ID: 441471
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Single - phase Load Symmetrising Active Filter Design 23/06/2015 Session 2 Devgon, P. Single - phase L oad S ymmetrising A ctive F ilter D esign Supervisor: Dr Adrià Junyent - Ferré This project examines several circuit topologies to convert three - phase grid supply to feed a single - phase load. In some industrial applications, such as the rail and traction industry, the loads draw heavy currents from a single - phase and cannot be connected directly to the grid, or the asymmetrical currents can c ause instabilities in the network. The solution is to implement an active filter between the grid connection and the load such that the grid sees a symmetric load. Alternatively, the filter can be connected in parallel with the load to provide compensation to the three phases. In order to meet the active aspect of the brief, the filter must be able to respond to changes in the grid supply and load with reasonable transient and steady - state response. Implementation of the converter topologies are simulated w ithin the MATLAB Simulink environment. The SimPowerSystems toolbox was used, as well as other control and signal processing elements, to model the converters and their control circuits. Several types of converters are considered, including the widely used back - to - back AC/DC/AC converter. The corresponding control circuits, which provide feedback and corrections based on voltage and current measurements, are also modelled.