Improved single phase SRF algorithm for CHB inverter based shunt active power filter under non-ideal supply conditions

This paper presents five-level cascaded H-bridge multilevel inverter based shunt active power filter for medium voltage and high power distribution system. An improved single-phase synchronous reference frame theory based control algorithm is proposed in this paper for solving current related power quality problems. This control is well capable of improving power factor and maintaining better voltage regulation in the distribution sector. This proposed control is a complete solution in case of balanced and/or unbalanced loading condition in existing distribution system. This control algorithm is equally effective in case of distorted and/or unbalanced supply voltage condition. The proposed system is designed in Simulink platform of MATLAB software. The effectiveness of the proposed algorithm is tested in different possible conditions. Test results suggest its effectiveness over conventional control algorithms.

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