Compensation of droop control using common load condition in DC microgrids to improve voltage regulation and load sharing

Yang, Nanfang; Paire, Damien; Gao, Fei; Miraoui, Abdellatif; Liu, Weiguo

doi:10.1016/j.ijepes.2014.07.079

Cited by 101 publications

(45 citation statements)

References 38 publications

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“…The conventional P-f droop characteristic [14] has been replaced by the characteristic P-V [15]. At typical distribution voltage levels (400V phase to phase), the lines are nearly purely resistive, and the voltage drop is mostly derived from line resistances.…”

Section: Distribution Scheme and Proposed Controlmentioning

confidence: 99%

Hierarchical coordination of a hybrid AC/DC smartgrid with central/distributed energy storage

Arboleya

Garcia

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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Abstract-This work describes a hybrid AC/DC Smart Grid distribution scheme installed at LEMUR microgrid laboratory. The control of the microgrid is carried out according to a hierarchical coordination considering the high level control. The configuration includes a microgrid (µG) connected to the main utility grid (MUG) by means of a solid state transformer (STT). The µG is formed by several nanogrids (nGs). All (nGs) are based on four wire configurations, as they are usually employed in AC distribution systems. However, the scheme is considered as a hybrid Smart Grid because the connection among different nanogrids and with the SST are DC connections. The SST is also equipped with a third port connected to a central energy storage system (CESS). The coordination between the different involved in the systems: the installed dispersed generators at nanogrid level, the nanogrids, the SST and the CESS has been implemented using a bottom-up hierarchical approach. Several configurations at nanogrid and microgrid levels are shown and analyzed. For making the coordination of the different elements of the microgrid, a fast power flow alorithm for estimating the state of the microgrid in real time was developed. In this paper the proposed structure is described paying special attention to the power flow algorithm. The results obtained with the power flow algorithm in simulations were validated at laboratory level.

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Section: Distribution Scheme and Proposed Controlmentioning

confidence: 99%

Hierarchical coordination of a hybrid AC/DC smartgrid with central/distributed energy storage

Arboleya

Garcia

et al. 2016

2016 IEEE Energy Conversion Congress and Exposition (ECCE)

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“…A typical approach to distributed control is droop control [8,9]. Droop control has also been shown effective in microgrids with renewable and highly variable resources [10,11] as well as in system with distributed energy storage [12,13]. In dc microgrids, droop control is equivalent to creating a virtual impedance between the source and the bus, such that the total load current is distributed to the sources based on the weighed sum of the droop settings.…”

Section: Background and Related Workmentioning

confidence: 99%

Energy storage requirements of dc microgrids with high penetration renewables under droop control

Weaver

Robinett

Parker

et al. 2015

International Journal of Electrical Power & Energy Systems

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Energy storage is a important design component in microgrids with high penetration renewable sources to maintain the system because of the highly variable and sometimes stochastic nature of the sources. Storage devices can be distributed close to the sources and/or at the microgrid bus. In addition, storage requirements can be minimized with a centralized control architecture, but this creates a single point of failure. Distributed droop control enables a completely decentralized architecture but, the energy storage optimization becomes more difficult. This paper presents an approach to droop control that enables the local and bus storage requirements to be determined. Given a-priori knowledge of the design structure of a microgrid and the basic cycles of the renewable sources, the droop settings of the sources are determined that minimize both the bus voltage variations and overall energy storage capacity required in the system. This approach can be used in the design phase of a microgrid with a decentralized control structure to determine appropriate droop settings as well as the sizing of energy storage devices.

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“…However, the average current needs to be computed and the chosen of shift gain becomes important which is not easily implemented in reality. In [13], a unified compensation method is proposed using the common load condition to compensate the voltage drop. However, the selection principle of compensation coefficient is also not easy.…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Secondary Control Approach for Voltage Restoration in the DC Distribution System

Gao¹,

Bozhko²,

Wheeler³

2016

SAE Technical Paper Series

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The paper will deal with the problem of establishing a desirable power sharing in multi-feed electric power system for future moreelectric aircraft (MEA) platforms. The MEA is one of the major trends in modern aerospace engineering aiming for reduction of the overall aircraft weight, operation cost and environmental impact. Electrical systems are employed to replace existing hydraulic, pneumatic and mechanical loads. Hence the onboard installed electrical power increases significantly and this results in challenges in the design of electrical power systems (EPS). One of the key paradigms for future MEA EPS architectures assumes high-voltage dc distribution with multiple sources, possibly of different physical nature, feeding the same bus(es). In our study we investigate control approaches to guarantee that the total electric load is shared between the sources in a desirable manner. A novel communication channel based secondary control method is proposed in this paper. Stability of the proposed method is investigated and it proves that the system stability margin is upgraded using the compensation method. The analytical results of the study will be supported by both time-domain simulations and experimental results.

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Compensation of droop control using common load condition in DC microgrids to improve voltage regulation and load sharing

Cited by 101 publications

References 38 publications

Hierarchical coordination of a hybrid AC/DC smartgrid with central/distributed energy storage

Hierarchical coordination of a hybrid AC/DC smartgrid with central/distributed energy storage

Energy storage requirements of dc microgrids with high penetration renewables under droop control

An Enhanced Secondary Control Approach for Voltage Restoration in the DC Distribution System

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