Journal of Electrical and Electronic Engineering
Volume 8, Issue 3, June 2020, Pages: 103-108
Received: Aug. 6, 2020;
Published: Aug. 10, 2020
Views 75 Downloads 91
Yunxia Dong, School of Electrical and Electronic Engineering, North China Electrical Power University, Beijing, China
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.
Research on Loss in Power Grid Induced by Three-Phase Imbalance, Journal of Electrical and Electronic Engineering.
Vol. 8, No. 3,
2020, pp. 103-108.
Asl, Dariush Keihan; Seifi, Ali Reza; Rastegar, Mohammad, Optimal energy flow in integrated energy distribution systems considering unbalanced operation of power distribution systems [J]. International journal of electrical power and energy systems. 2020, 121: 106132.
Zhang Yinghui. The power quality problem of power supply and distribution system must be regulated and caused enough attention [J]. Electrical Applications, 2014, 33 (7): 15-16.
Sun Yan, Lin Shenghong, Liu Mingbo. Analysis of optimal power supply capacity of medium voltage distribution network [J]. Southern Power System Technology, 2014, 8 (1): 80-84.
M. Jawad Ghorbani, Hossein Mokhtari. Impact of Harmonics on Power Quality and Losses in Power Distribution Systems [J]. International Journal of Electrical and Computer Engineering, 2015, 7 (1): 166-174.
Congling Li, Peng Wang. Yucheng Li, Research and Application of Unbalanced Three-phase Load Control Scheme for Distribution Network [J]. Editorial Department of Journal of Shangluo University, 2018, 2: 74-78.
Feng Cheng, Xu Changbao. Analysis of influence of three-phase current imbalance and harmonics on power grid loss [J]. Power Quality, 2016, (7): 47-51.
Yanliang Wang, Zhishun Yue, Jinquan Wang, Zhang Qi. Analysis of harmonic additional loss and energy saving for reducing loss [J]. Power electronics, 2009 (2): 15-16.
IEEE. IEEE recommended practice for establishing transformer capability when supplying nonsinusoided load currents. Standard ANSI/IEEE C57. 110-1986.
Zhang An-hong. Research of Loss and Design for Transformer [D]. Changsha: Hunan University, 2005.
Mabel Ebenezer, Rajkumar Mattacaud Ramachandralal, Chandramohanan Nair Padmanabha Pillai Sarasamma. Study and Analysis of the Effect of Harmonics on the Hot Spot Temperature of a Distribution Transformer Using Finite-Volume Method [J]. Electric Power Components and Systems Electric Power Components and Systems, 2015: 2251-2261.
Yang Xiao-ming. Influence Analysis on 10kV Distribution Transformer's Los s [J]. Hunan Water Conservancy and Electric Power, 2001, (3): 33-34.
Ruan Quan-rong, Wang Liang, Shi Wei. A Kind of Transformer's Nonlinear Model Considering Loss [J]. Transaction of Xi'an Jiaotong University, 2006, 40 (10).
Zhang Jianzhong, Cheng Ming, Zhu Xiaoyong. A novel three-phase doubly salient permanent magnet generator [C]. ICEMS，Nanjing，China, 2005: 407-411.
Pi Jianghong, Zhang Tiqiang, Ming Hafting. Energy consumption calculation and energy saving measures of high-voltage transmission lines [J]. Energy and Energy Conservation, 2013, 10 (97): 60-61.
Wang Yanliang, Yue Zhishun, Wang Jingquan, et al. Analyzing the addition loss of harmonic and how to reducing it for energy saving [J]. Electrical Engineering, 2009, 2 (3): 15-19.