Harmonic Resonance Monitoring in Distribution Networks Considering Load Variation and Possible Network Configurations

Abstract

In this paper, three methods based on harmonic resonance mode analysis are proposed for placing PQMs to monitor all harmonic resonance conditions in a power system. These methods compute the optimal number and sites of PQMs for varied load profiles and network configurations such that all harmonic resonance conditions would be monitored. This paper introduces the harmonic resonance severity index that enables electric network owners to place PQMs in a way to monitor only worst-case harmonic resonance conditions. Also, in this paper, the harmonic resonance observability index is introduced, enabling electrical owners to afford suitable numbers of PQMs based on their budget limitations. The efficiency of the proposed methods has been examined on test systems. The results indicate that using the proposed approach, all harmonic resonance conditions can be captured with an optimal number of PQMs. The proposed approaches also operate with system uncertainties present, which overcomes one of the major weaknesses of the prior approaches. It observes the bus voltage if either this bus or one of the adjacent buses is equipped with at least one PMQ, reduces the number of PQMs, and rearranges their locations to develop a cost-effective strategy, addressing a long-standing challenge.