A Perturbation and Observation Approach to Decentralized Power Loss Minimization in AC Microgrids

Nestor Vazquez, Samson Shenglong Yu, Tat Kei Chau, Tyrone Fernando, Herbert Ho Ching Iu

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This study presents a simple decentralized strategy for power loss minimization in transmission lines in isolated AC microgrids. In this scenario, the proposed approach works as a decentralized secondary control, since the generation units use droop functions as primary controllers (looking at the microgrid from a hierarchical point of view). Therefore, assuming the droop control guarantees the power balance between generation and consumption (as long as the total power demand does not exceed the microgrid generation capacity), the proposed secondary control has the objective of reducing the power loss in the transmission lines. This secondary control adapts the primary control droop functions in order to reach a steady state where the total power loss is minimum. The main advantage of this strategy is the completely autonomous operation of the participating DGs, using only local measurements of system frequency and bus voltages. The distributed adaptation of the droop functions for each of the DGs is carried out by performing a Perturbation and Observation (PO) algorithm. Initially, for each DG at a time, a small perturbation in the P -f droop function is applied. Then, the produced effects on the system frequency and bus voltage are examined in order to identify if the resultant power balance has reduced or increased the system power loss. This procedure is executed indefinitely by all the participating DGs in the microgrid over a fixed time-step. Eventually, the system reaches a steady state where the power generation of each DG produce the minimum power loss in the transmission lines. The procedure continues endlessly, and any load variation or change in the microgrid topology will lead to a new steady state with different power generation levels for each DG and minimum power loss.

Original languageEnglish
Title of host publicationProceedings - 2019 IEEE 28th International Symposium on Industrial Electronics, ISIE 2019
Place of PublicationUSA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781728136660
Publication statusPublished - 1 Jun 2019
Event28th IEEE International Symposium on Industrial Electronics, ISIE 2019 - Pinnacle Hotel , Vancouver, Canada
Duration: 12 Jun 201914 Jun 2019

Publication series

NameIEEE International Symposium on Industrial Electronics


Conference28th IEEE International Symposium on Industrial Electronics, ISIE 2019
Otherhe ISIE annually gathers together Industry experts, researchers and academics to share ideas and experiences surrounding frontier technologies, breakthroughs, innovative solutions, research results, as well as initiatives related to industrial electronics and their applications. Several well-known academic and industrial experts will deliver the plenary and keynote talks.
It is a great opportunity to meet old friends and colleagues, find new ones and attend many high-quality technical activities as well as very enjoyable social ones. We hope 2019 ISIE will be a remarkable and unforgettable event.
It will be held Wednesday through Friday, 12–14 June 2019, at Pinnacle Hotel Harbourfront, Vancouver, Canada.
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