This paper studies effect of power electronic load and its current harmonics in increasing current of shunt capacitance in the distribution network. Analytical method is done to show the effect of power electronic load on the current harmonic In order to show the proposed method effectiveness, a simple power electronic load is used including a rectifier bridge, a smoothing capacitor filter and a resistance. It has been shown that by increasing power electronic load, the shunt capacitance current is increased where the rate of current variation is related to the structure of power electronic load. MATLAB and PSCAD software's are used to simulate the proposed distribution network.

In this paper, voltage sag and voltage Total Harmonic Distortion (THD) in the distribution network are studied. The proposed electrical network is modeled by electrical source, Line and source impedances. It is assumed that the electrical load of this network is a sample electronic load. This load is a rectifier bridge where its output terminal is connected to a capacitor bank and a linear resistance. The distribution network power quality is analyzed by changing the load impedance, the capacitor bank and number of load in the network. The Voltage sag and THD in the distribution network are studied using PSCAD and MATLAB software.