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1887

access icon free Adaptive primary droop control for islanded operation of hybrid AC–DC MGs

© The Institution of Engineering and Technology
Received 14/09/2017, Accepted 21/02/2018, Revised 08/01/2018, Published 22/02/2018

This study is dedicated to establish an adaptive primary droop control of interlinking converter (IC) for the islanded operation of hybrid AC–DC microgrids (MGs). In this practise, the amount of transferred power through the IC is controlled such that all of the resources in both AC and DC MGs are in equal loading per cents. To do so, two different notions are contemplated. In the first one, the IC is controlled such that the aforementioned control objective is satisfied for all possible values of transmission lines impedance angles. To this end, a new algorithm is developed within which the IC estimates the impedance angle based on the local measurements in AC MG and then adapts itself. In the second outlook, the uncertainties in association with the renewable energy resources are considered and their effects are explored on IC performance. To lessen the negative impacts of uncertainties and fluctuating power generation of renewable resources, the control of IC is updated based on the instantaneous power generation in AC and DC MGs. Accordingly, the main control objective is effectively pursued. Performance of the proposed adaptive droop control is evaluated on a test MG. Results are discussed in depth.

Inspec keywords: power generation faults; power convertors; adaptive control; power generation control; power transmission lines; distributed power generation; power distribution faults; renewable energy sources

Other keywords: IC; hybrid AC–DC microgrids; transmission lines impedance angles; renewable energy resources; impedance angle; local measurements; interlinking converter; hybrid AC–DC MG islanded operation; adaptive primary droop control; power generation fluctuation

Subjects: Distributed power generation; Control of electric power systems; Self-adjusting control systems; Power convertors and power supplies to apparatus

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