Compensation of Reactive Power in Non-Linear Loads Using Hybrid DSTATCOM Topology

摘要

The D-STATCOM is used to mitigate the power quality issues such as transients, voltage fluctuation etc. The nonlinear loads such as computer, VFD, rectifier draws non-sinusoidal nature of current even though the supply voltage is sinusoidal. The complete study includes the comparison of traditional topology with new improved hybrid D-STATCOM topology. The D-STATCOM model has been simulated in MATLAB Simulink. The series capacitor along with LCL filter is used to minimize the size of passive component that eventually reduces the voltage rating to the front end of the VSI. The values of the LCL filter have been selected considering the power losses in the damping resistor. The reduction in the power loss in the damping resistor reduces the power rating of the VSI. This will reduce the DC-link voltage and voltage across the shunt capacitor of the LCL filter. The results are validated by analyzing the reduction in power rating of DSTATCOM. The source current, PCC voltage, filter current is compared for all the topologies and best alternative has been presented comparing the size of filter inductor, reduction in the damping power loss, and current compensation. The compensation performance of LCL filter is analyzed by analyzing the harmonic ripples and percentage of total harmonic distortion.