Utility customer model for fifth harmonic state estimation in combination with fundamental state estimation in distribution network

Abstract

In the last decade, harmonic analysis of Japanese middle voltage (MV) customer and low voltage (LV) customer has been done, the distribution of the fifth harmonic current can be classified MV customer's single phase load, LV customer's three phase and single phase load named group A and MV three phase load named group B, and the amplitude per load kW has been investigated from sum of each current vector. By the application of this knowledge, there is a possibility to estimate the harmonic distribution with many harmonic source in the distribution network. In this paper, we demonstrate a harmonic state estimation (HSE) in combination with fundamental state estimation (FSE) method with limited measurement condition by using the fifth harmonic current model of utility customer. Numerical experiments are conducted in seven node distribution network with transient simulation to test the proposed method. The results show that the proposed HSE in combination with FSE by using utility customer model approach can reliably identify harmonic distribution with distributed load conditions, background harmonic voltage and shunt capacitors.