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Regulation of DC microgrid voltage using optimized droop index control-based high gain converters in the presence of static and dynamic loads

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Abstract

Increase in load on a DC bus may cause a fall in bus voltage. Normally, in a DC microgrid, which is integrated with renewable sources, energy storage devices are connected to meet the excess load demand. The microgrid may or may not be connected to the utility grid. In our work, high-gain high-efficiency DC–DC converters are used to integrate the solar PV and storage system with the DC bus for the step up or step down the voltage level depending on the direction of exchange of power. The droop index control technique is used in solar converters and battery converters to regulate the DC bus voltage. The optimized droop coefficient is obtained using the particle swarm optimization method. In the presence of both static load and dynamic load, the impact of optimized droop index control, un-optimized droop index control, and conventional control are compared to establish the superiority of the proposed optimized droop control technique for variable solar insolation conditions. The DC microgrid with two parallel-connected PV modules, battery energy storage, the corresponding converters with their controllers, different types of variable loads, and the utility grid were modeled in PSCAD/EMTDC software.

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  1. Electrical Engineering Department, Visvesvaraya National Institute of Technology, Nagpur, 440010, India

    Ram Babu Thogaru & Arghya Mitra

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  1. Ram Babu Thogaru
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  2. Arghya Mitra
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Correspondence to Ram Babu Thogaru.

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Thogaru, R.B., Mitra, A. Regulation of DC microgrid voltage using optimized droop index control-based high gain converters in the presence of static and dynamic loads. Electr Eng 104, 1649–1665 (2022). https://doi.org/10.1007/s00202-021-01403-5

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  • DOI: https://doi.org/10.1007/s00202-021-01403-5

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