Author(s)

Hengyong Liu^1*, Xiaofu Xiong², Jinxin Ouyang², Xiufen Gong², Yinghua Xie¹, Jing Li¹

¹Shenzhen Power Supply Co. Ltd., Shenzhen, China.
²State Key Laboratory of Power Transmission Equipments & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing, China.

The neutral grounding mode of medium-voltage distribution network decides the reliability, overvoltage, relay protection and electrical safety. Therefore, a comprehensive consideration of the reliability, safety and economy is particularly important for the decision of neutral grounding mode. This paper proposes a new decision method of neutral point grounding mode for mediumvoltage distribution network. The objective function is constructed for the decision according the life cycle cost. The reliability of the neutral point grounding mode is taken into account through treating the outage cost as an operating cost. The safety condition of the neutral point grounding mode is preserved as the constraint condition of decision models, so the decision method can generate the most economical and reliable scheme of neutral point grounding mode within a safe limit. The example is used to verify the feasibility and effectiveness of the decision method.

Distribution Network; Neutral Grounding Mode; Reliability; Decision Method; Objective Function

Liu, H. , Xiong, X. , Ouyang, J. , Gong, X. , Xie, Y. and Li, J. (2014) Study on Decision Method of Neutral Point Grounding Mode for Medium-Voltage Distribution Network. Journal of Power and Energy Engineering, 2, 656-664. doi: 10.4236/jpee.2014.24088.