A Capacity Design Method of Distributed Battery Storage for Controlling Power Variation with Large-Scale Photovoltaic Sources in Distribution Network

Connection of a significant amount of distributed generation, such as solar photovoltaic (PV) capacity, may lead to problems in distribution networks due to violations of distribution network hosting capacity (HC) limits. HC enhancement techniques, such as energy storage, could increase the allowable PV penetration level in the distribution network, reducing the need for transmission and large-scale generation expansion. However, current approaches for transmission and generation expansion planning do not account for distribution network HC limits. As a consequence, it is hard to quantify the impact and benefits of HC enhancement in the context of long-term grid expansion planning. This paper presents a novel integrated planning approach, combining a two-stage transmission and generation expansion planning model with a distribution network hosting capacity assessment, which allows for inclusion of detailed distribution network constraints We test this method on a stylized representation of the Malaysian grid. Our results show that distribution constraints have a significant impact on optimal transmission expansion plans and significantly increase overall system costs. HC enhancement in the form of battery storage does not significantly mitigate this but does lead to a cost decrease regardless of distribution network constraints. We also show how our approach can identify the key interactions between transmission and distribution networks in systems with high levels of renewable and storage technologies. In particular, HC enhancement with battery storage can act as a substitute or complement to line investment, depending on the renewable energy penetration, the storage location and the level of coordination in the network.

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Influence of Massive Substructures on Capacity Design Method

IABSE Symposium Report ◽

10.2749/222137816819258591 ◽

2016 ◽

Vol 106 (10) ◽

pp. 357-362

Author(s):

Yudong MAO ◽

Jianzhong LI

Keyword(s):

Design Method ◽

Capacity Design

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Design of a Variable-Stiffness Compliant Skin for a Morphing Leading Edge

Applied Sciences ◽

10.3390/app11073165 ◽

2021 ◽

Vol 11 (7) ◽

pp. 3165

Author(s):

Zhigang Wang ◽

Yu Yang

Keyword(s):

Composite Laminate ◽

Large Scale ◽

Design Method ◽

Leading Edge ◽

Variable Stiffness ◽

Manufacturing Constraints ◽

Aircraft Wing ◽

Noise Abatement ◽

Civil Aircraft ◽

Final Profile

A seamless and smooth morphing leading edge has remarkable potential for noise abatement and drag reduction of civil aircraft. Variable-stiffness compliant skin based on tailored composite laminate is a concept with great potential for morphing leading edge, but the currently proposed methods have difficulty in taking the manufacturing constraints or layup sequence into account during the optimization process. This paper proposes an innovative two-step design method for a variable-stiffness compliant skin of a morphing leading edge, which includes layup optimization and layup adjustment. The combination of these two steps can not only improve the deformation accuracy of the final profile of the compliant skin but also easily and effectively determine the layup sequence of the composite layup. With the design framework, an optimization model is created for a variable-stiffness compliant skin, and an adjustment method for its layups is presented. Finally, the deformed profiles between the directly optimized layups and the adjusted ones are compared to verify its morphing ability and accuracy. The final results demonstrate that the obtained deforming ability and accuracy are suitable for a large-scale aircraft wing.

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Optimal Design of Novel Blade Profile for Savonius Wind Turbines

Energies ◽

10.3390/en14123484 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3484

Author(s):

Tai-Lin Chang ◽

Shun-Feng Tsai ◽

Chun-Lung Chen

Keyword(s):

Wind Energy ◽

Drag Force ◽

Wind Turbines ◽

Rural Areas ◽

Large Scale ◽

Design Method ◽

Angular Position ◽

Vertical Axis ◽

Blade Profile ◽

Main Concept

Since the affirming of global warming, most wind energy projects have focused on the large-scale Horizontal Axis Wind Turbines (HAWTs). In recent years, the fast-growing wind energy sector and the demand for smarter grids have led to the use of Vertical Axis Wind Turbines (VAWTs) for decentralized energy generation systems, both in urban and remote rural areas. The goals of this study are to improve the Savonius-type VAWT’s efficiency and oscillation. The main concept is to redesign a Novel Blade profile using the Taguchi Robust Design Method and the ANSYS-Fluent simulation package. The convex contour of the blade faces against the wind, creating sufficient lift force and minimizing drag force; the concave contour faces up to the wind, improving or maintaining the drag force. The result is that the Novel Blade improves blade performance by 65% over the Savonius type at the best angular position. In addition, it decreases the oscillation and noise accordingly. This study achieved its two goals.

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Optimizing Operations of Sodium Sulfur (NAS) Large-scale Battery Storage

2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) ◽

10.1109/pedg48541.2020.9244446 ◽

2020 ◽

Author(s):

Ali Almarzooqi ◽

Hamad Albeshr ◽

Ashot Mnatsakanyan ◽

Wadhah Alzahmi ◽

Endika Bilbao ◽

...

Keyword(s):

Large Scale ◽

Battery Storage ◽

Sodium Sulfur

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Investigation of the Impact of Large-Scale Integration of Electric Vehicles for a Swedish Distribution Network

Energies ◽

10.3390/en12244717 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4717 ◽

Cited By ~ 1

Author(s):

Sylvester Johansson ◽

Jonas Persson ◽

Stavros Lazarou ◽

Andreas Theocharis

Keyword(s):

Electric Vehicles ◽

Power Distribution ◽

Large Scale ◽

Electrical Power ◽

Distribution Network ◽

Transport Sector ◽

Smart Charging ◽

Large Scale Integration ◽

Scale Integration ◽

The Impact

Social considerations for a sustainable future lead to market demands for electromobility. Hence, electrical power distribution operators are concerned about the real ongoing problem of the electrification of the transport sector. In this regard, the paper aims to investigate the large-scale integration of electric vehicles in a Swedish distribution network. To this end, the integration pattern is taken into consideration as appears in the literature for other countries and applies to the Swedish culture. Moreover, different charging power levels including smart charging techniques are examined for several percentages of electric vehicles penetration. Industrial simulation tools proven for their accuracy are used for the study. The results indicate that the grid can manage about 50% electric vehicles penetration at its current capacity. This percentage decreases when higher charging power levels apply, while the transformers appear overloaded in many cases. The investigation of alternatives to increase the grid’s capabilities reveal that smart techniques are comparable to the conventional re-dimension of the grid. At present, the increased integration of electric vehicles is manageable by implementing a combination of smart gird and upgrade investments in comparison to technically expensive alternatives based on grid digitalization and algorithms that need to be further confirmed for their reliability for power sharing and energy management.

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