Stability and Decentralized Control of Plug-and-Play DC Distribution Grids

Direct Current (DC) grids are considered an attractive option for integrating high shares of renewable energy sources in the electrical distribution grid. Hence, in the future, Alternating Current (AC) and DC systems could be interconnected to form hybrid AC-DC distribution grids. This paper presents a two-step state estimation formulation for the monitoring of hybrid AC-DC grids. In the first step, state estimation is executed independently for the AC and DC areas of the distribution system. The second step refines the estimation results by exchanging boundary quantities at the AC-DC converters. To this purpose, the modulation index and phase angle control of the AC-DC converters are integrated into the second step of the proposed state estimation formulation. This allows providing additional inputs to the state estimation algorithm, which eventually leads to improve the accuracy of the state estimation results. Simulations on a sample AC-DC distribution grid are performed to highlight the benefits resulting from the integration of these converter control parameters for the estimation of both the AC and DC grid quantities.

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Design Aspects of Medium and Low Voltage DC Distribution Grids - An Overview

2020 5th IEEE Workshop on the Electronic Grid (eGRID) ◽

10.1109/egrid48559.2020.9330652 ◽

2020 ◽

Author(s):

Julian Saat ◽

Raphael Bleilevens ◽

Dominik Mildt ◽

Jens Priebe ◽

Niklas Wehbring ◽

...

Keyword(s):

Low Voltage ◽

Dc Distribution ◽

Distribution Grids

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Voltage dependent pricing in DC distribution grids

2013 IEEE Grenoble Conference ◽

10.1109/ptc.2013.6652227 ◽

2013 ◽

Cited By ~ 14

Author(s):

Laurens Mackay ◽

Markus Imhof ◽

Roger Wiget ◽

Goran Andersson

Keyword(s):

Dc Distribution ◽

Voltage Dependent ◽

Distribution Grids

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An Innovative Adaptive Droop Control Based on Available Energy for DC Micro Distribution Grids

Energies ◽

10.3390/en13112983 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2983 ◽

Cited By ~ 1

Author(s):

Duc Nguyen Huu

Keyword(s):

Storage Systems ◽

Energy Levels ◽

Adaptive Method ◽

Droop Control ◽

Available Energy ◽

Dc Distribution ◽

Battery Energy Storage Systems ◽

The Stability ◽

Battery Energy ◽

Distribution Grids

DC distribution grids are increasingly a promising solution for wind and solar integration due to good matching with DC output voltage such as photovoltaic (PV) array systems, distributed battery storage systems (BESS) and electric vehicles. To overcome the control problems involving coordination control schemes of multi-BESSs in real-time as well as operation strategies of DC grids in the long-term, this paper presents the effective adaptive coordinated droop control of multi-battery energy storage systems (MBESSs) in DC distribution grids. The adaptive coordinated droop is proposed according to the available energy levels in BESSs. With the proposed method, the dual-objectives, which are stabilization of DC voltages especially through disturbance for instance outage of BESS and enhancement of State of Charge (SOC)-balance speed among BESSs, can be achieved. Analytical derivations are established to investigate the impacts of the adaptive method. Meanwhile, the influence of the proposed method on the stability is presented.

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