Abstract
The power quality problems in the power grid have some direct impact on the distribution network such as to increase the system's active power loss. There are many single-phase power users in the power distribution network which will inevitably cause the power quality problems such as three-phase imbalance. Three phase imbalance is widespread across the power grid and causes additional loss in the transformer and the transmission line. Therefore, the loss of the low-voltage distribution network is also increased rapidly, so it is of great significance to consider the loss of low-voltage distribution network under the disturbance of such a power quality problem. In this paper, the calculation method of the additional losses of the transmission line and the transformer in three-phase imbalance is derived theoretically. The accuracy of theoretical formula is verified in MATLAB/SIMULINK simulation platform. Secondly, the simulation data of the additional loss generated in the transformer and the transmission line when the three-phase imbalance exists is comprehensively analyzed. Several cases of different unbalanced loads are considered in the paper. The additional value of the power loss relative to the balanced case which is caused by the three phase imbalance is the largest one for the case in which phase A and B have heavy load and phase C is light load and the absolute value of the power loss in this case is also the largest in three cases. The additional loss is not proportional to the total loss both for the transformer and the line. We verify that the additional loss caused by three-phase imbalance is dependent on the unbalanced degree. As the unbalanced degree is increasing, both the absolute value of the additional loss and the increment ratio of loss for the transformer and the line are enhanced simultaneously.
Highlights
As various nonlinear and impact loads are widely used in modern society, more and more power quality problems have emerged in the power grid
The results show that both the additional loss and the increment ratio of loss for the transformer and the line are increasing with the increase of the Imbalance in power grid is a main aspect of power quality
The degree of current imbalance can influence the additional loss of the equipment such as the transformer and the transmission line in the low voltage distribution network
Summary
As various nonlinear and impact loads are widely used in modern society, more and more power quality problems have emerged in the power grid. The increase of the additional loss in the low-voltage distribution network caused by the power quality problems directly affects the operating efficiency of the power grid companies [1,2,3]. Literature [4] analyzes the effect of harmonics on the losses of low-voltage distribution networks. The literature [6] analyzes the effect of the transformer three-phase load asymmetry on the line loss ratio of the low-voltage distribution network.
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