This Paper presents one way for power quality conditioning. This way means parallel connection of the STATCOM circuits with the network, therefore it is possible to “isolate” load from source and vice versa. Described conditioner makes possible to get: i) sinusoidal source current; ii) reactive power compensation; iii) load voltage stabilization; iv) balanced source in conditions of the unbalanced load. As STATCOM, the four level cascade based VSI has been used.