Review on DSTATCOM with L-C-L filter to compensate reactive and non-linear loads

Abstract

This paper gives an introduction about an improved hybrid distribution static compensator (DSTATCOM)
methodology to compensate reactive and nonlinear loads with reduced VSI rating, DC link (capacitor) voltage and filter size.
An LCL filter with low value of inductor compared to old L filter is used at the front end of a voltage source inverter (VSI),
which givesthe mitigation of switching harmonics. Voltage of the DSTATCOM can be reduced with capacitor to be connected
in series with an LCL filter. The power rating of the voltage source inverter (VSI) has also been decreased. With reduced dclink voltage, the voltage across the capacitor connected in parallel with the LCL filter will be also less. It will minimize the
power losses in the damping resistor as compared with the old LCL filter with passive damping. Therefore, the given
DSTATCOM methodology will have reduced cost, rating, and size with improved efficiency and current compensation
technique compared with the old fashioned methodology. A systematic procedure of DSTATCOM controlling and filter
designing has been presented. The advantages of the proposed DSTATCOM methodology over oldmethodologies is validated
through simulation.