Evaluation of Zero and Negative Sequence Currents Influence of Asymmetric Load on the Power Losses and Quality in Distribution Networks

Researchers and system engineers have given distribution system power quality issues a lot of attention recently. Due to the rising use of sensitive loads in the distribution system, difficulties with unbalanced voltage coefficient and losses are given the utmost attention among the many power quality challenges. This paper studies the effect of the various compensation devices of zero, negative and reactive current components on both the unbalanced distribution system losses and the unbalanced voltage coefficient. The effect of the conventional zero current compensators such as zigzag transformer is compared with modern unified power control (UPC) which can compensate not only zero current component but also the negative and reactive current components. This paper develops a method to evaluate the performance of various compensators on the losses and unbalanced voltage coefficient if these devices are applied in IEEE 13 bus unbalanced system loaded by standard daily loading. This paper provides a general platform to evaluate the unbalanced distribution system's performance under various proposed compensators' effect.