The paper reviews different approaches, technologies, and strategies to manage large-scale schemes of variable renewable electricity such as solar and wind power. We consider both supply and demand side measures. In addition to presenting energy system flexibility measures, their importance to renewable electricity is discussed. The flexibility measures available range from traditional ones such as grid extension or pumped hydro storage to more advanced strategies such as demand side management and demand side linked approaches, e.g. the use of electric vehicles for storing excess electricity, but also providing grid support services. Advanced batteries may offer new solutions in the future, though the high costs associated with batteries may restrict their use to smaller scale applications. Different “P2Y”-type of strategies, where P stands for surplus renewable power and Y for the energy form or energy service to which this excess in converted to, e.g. thermal energy, hydrogen, gas or mobility are receiving much attention as potential flexibility solutions, making use of the energy system as a whole. To “functionalize” or to assess the value of the various energy system flexibility measures, these need often be put into an electricity/energy market or utility service context. Summarizing, the outlook for managing large amounts of RE power in terms of options available seems to be promising.

https://research.aalto.fi/files/6557604/lund_et_al_review.pdf

Review of energy system flexibility measures to enable high levels of variable renewable electricity

A review on compressed air energy storage: Basic principles, past milestones and recent developments

Concerns about climate change as well as fossil fuel usage restrictions motivate the energy transition to a sustainable energy sector requiring very high penetration level of renewable energy sources in the World energy matrix, including those heavily hydrocarbon-based as fuel for transportation. Some of these renewable sources have an uncontrollable output and managing the variability is challenging. The current upward trend in renewables participation will demand even more flexibility from the energy systems. Among several options for increasing flexibility, energy storage (ES) is a promising one considering the variability of many renewable sources. The purpose of this study is to present a comprehensive updated review of ES technologies, briefly address their applications and discuss the barriers to ES deployment. Methodology involves the description and the analysis of ES many existing and developing technologies. ES applications are discussed briefly using logistic and parametric classification logics. As result of this study, it will be pointed out that no ES technology outstands simultaneously in all technical characteristics and consequently, selection should be driven on a case base analysis. Economic feasibility of ES business models and establishment of a well-suited regulatory environment are major issues to unlock ES deployment. Regarding energy transition, Power-to-Gas, Power-to-Liquids and Solar-to-Fuel technologies are very promising and further studies about these technologies are required to better understand their possibilities and how to overcome the barriers to their practical usage.

Energy storage in the energy transition context: A technology review

This book equips the reader to understand every important aspect of the dynamics of rotating machines. Will the vibration be large? What influences machine stability? How can the vibration be reduced? Which sorts of rotor vibration are the worst? The book develops this understanding initially using extremely simple models for each phenomenon, in which (at most) four equations capture the behavior. More detailed models are then developed based on finite element analysis, to enable the accurate simulation of the relevant phenomena for real machines. Analysis software (in MATLAB) is associated with this book, and novices to rotordynamics can expect to make good predictions of critical speeds and rotating mode shapes within days. The book is structured more as a learning guide than as a reference tome and provides readers with more than 100 worked examples and more than 100 problems and solutions.

/pdf/dynamics-of-rotating-machines-499re2kizd.pdf

Dynamics of rotating machines

A surgical fastener applying apparatus includes an anvil section and a cartridge section, where the cartridge section and the anvil section are movable from an unclamped position to a clamped position. The cartridge section has a plurality of retention slots, a plurality of first surgical fasteners and a plurality of second surgical fasteners. The plurality of first surgical fasteners has a first backspan with a first configuration and the plurality of second surgical fasteners has a second backspan with a second different configuration. In addition, when the first configuration applies a first compressive force to tissue and the second configuration applies a second different compressive force to tissue.

Variable compression surgical fastener apparatus

A hybrid energy storage system is defined here as one which comprises two series-connected energy stores (using different storage technologies), only one of which is connected to the grid. Such a plant can take advantage of certain characteristics of different storage technologies, and the example considered in this paper is a liquid air energy storage (LAES) plant with some compressed air energy storage (CAES) capacity, taking advantage of the low storage cost for LAES and relatively high efficiency for CAES. An algorithm is presented which can be used to find the maximum possible profits that may be obtained from a hybrid plant through electricity price arbitrage, and it is shown that a hybrid compressed air–liquid air plant with 2.5:1 ratio of charge time to discharge time profiting purely through arbitrage gives higher profit per unit CapEx than the equivalent pure CAES and pure LAES plant if charge time is longer than 36 h. A realistic control strategy is also presented which can be used if the plant operator has a certain amount of knowledge of future electricity prices. It is shown that, for a given foresight period, the performance of this strategy increases with the plant's round-trip efficiency.

Economic analysis of a hybrid energy storage system based on liquid air and compressed air

The Application of the IRS and Balanced Realization Methods to Obtain Reduced Models of Structures with Local Non-Linearities

The effect of a nuclear baseload in a zero-carbon electricity system: An analysis for the UK

In this paper we demonstrate the capabilities of geometric algebra by the derivation of a formula for the determinant of the sum of two matrices in which both matrices are separated in the sense that the resulting expression consists of a sum of traces of products of their compound matrices. For the derivation we introduce a vector of Grassmann elements associated with an arbitrary square matrix, we recall the concept of compound matrices and summarize some of their properties. This paper introduces a new derivation and interpretation of the relationship between p-forms and the pth compound matrix, and it demonstrates the use of geometric algebra, which has the potential to be applied to a wide range of problems.

/pdf/use-of-geometric-algebra-compound-matrices-and-the-1a81tstr8o.pdf

Use of geometric algebra: compound matrices and the determinant of the sum of two matrices

Renewable energy provides the potential for a future in which abundant energy is available with extremely low levels of emission of harmful substances into the environment. The net resources present in most locations exceed the present local requirements for power but two main considerations limit the potential: (a) the cost of the systems used to convert the energy from its primary form and (b) the requirement to balance the supply of power with demand for that power. Presently, these two considerations are predominantly treated as independent concerns to be addressed by different communities. This paper asserts that this separation is both unnecessary and ill-advised in the context of most renewable energy forms and it sets out the case for the integration of energy storage, in its broadest sense, with systems that harvest renewable energy. In the case of wind power in particular it notes two distinct possibilities for such integration that stand up to scrutiny. The paper recognises that energy storage ...

https://journals.sagepub.com/doi/pdf/10.1260/0309-524X.39.2.129

Integrating Energy Storage with Renewable Energy Generation

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