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The growing complexity of the electrified railway systems in terms of both new technologies and automation requires a careful control of power quality disturbances they cause; the disturbances depend upon the traction system structure. It creates power quality issues in the grid. Negative sequence and harmonic currents have become the main issues in high speed train traction systems. Railway static power conditioner (RPC) has been developed to mitigate the power quality issues. V/V traction transformer has been used for power supply to the traction. A Fuzzy Controller based comprehensive technique for compensation of negative sequence and harmonic currents have been discussed. RPC is a back to back connected converter with a dc link. The controller also provides a constant dc link voltage and thus helps in the compensation of power quality problem. Thus the control technique improves the power quality in railway traction.

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