This paper presents a series connected custom power device (CPD) called transformer less dynamic voltage restorer (DVR) is used to protect sensitive loads in the load side by mitigating power quality problems present in the source side or at the point of common coupling (PCC). Series connected three single phase voltage source inverter (VSI) with filter design makes transformer less DVR to achieve desired load voltage magnitude with smooth sinusoidal waveform. Hysteresis controller is used for generating pulses for the VSI present in the Transformer less DVR and the error signal is generated by using combined Clark’s and Park’s transformation technique. The performance analysis of the transformer less DVR is verified using the MATLAB/SIMULINK software. © Springer Science+Business Media Singapore 2017.