scholarly journals Methodological Evaluation of Storage Systems for Flexible Power Generation from Solid Biomass

2018 ◽  
Vol 41 (11) ◽  
pp. 2168-2176 ◽  
Author(s):  
Matthias Stark ◽  
Christoph Trinkl ◽  
Wilfried Zörner ◽  
Rick Greenough
Keyword(s):  
Power Generation ◽  
Storage Systems ◽  
Solid Biomass ◽  
Methodological Evaluation

Application of battery energy storage systems in industrial facilities

2021 ◽  
Vol 61 (2) ◽  
pp. 563
Author(s):  
Hamed Sharafizad
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Storage Systems ◽  
Energy Storage Systems ◽  
Spinning Reserve ◽  
Battery Energy Storage ◽  
Industrial Facilities ◽  
Battery Energy Storage Systems ◽  
Battery Energy ◽  
Storage Units

For any facility, reliability and availability of power are key. Traditional gas- or diesel-driven power generation designs for facilities rely on generated spinning reserve to achieve power system stability and availability for defined operational scenarios and expected transients. Spinning reserve is extra generating capacity that is usually introduced by running additional power generator(s). Battery energy storage systems (BESSs) as energy storage units provide for a virtual spinning reserve in a hot standby arrangement to achieve the same effect for a set period during operating scenarios and transient events. Use of BESS technology is becoming more frequent within electrical network systems, remote sites and industrial facilities on the back of improved battery technology. This lends itself to better BESS reliability, effectiveness and lower associated cost to procure and install. Many of Clough’s projects are remote and islanded where they need to be self-sufficient, generating and distributing their own power needs. BESS units are scalable energy storage systems that can be used as a part of power generation solutions for facilities installed onshore or offshore. In addition to supplementing the primary generation on a facility as static storage units, BESS units offer benefits such as reduced emissions on facilities by not burning fossil fuels to achieve spinning reserve; they also allow for power management of generation systems, store any excess power from primary generators, allow for integration of renewables, offer constructability benefits and reduced operational/maintenance costs. The commercial and environmental benefits of BESS units are key drivers in Clough’s decision to embrace their use on future projects.

Are High Renewable Energy Shares In Large Power Grids In Indonesia Too Expensive?

2019 ◽  
Vol 2 (1) ◽  
pp. 36-48
Author(s):  
Matthias Günther
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Power Supply ◽  
Renewable Resources ◽  
Storage Systems ◽  
Technical Problem ◽  
Developed Countries ◽  
Power Grids ◽  
Geothermal Resources ◽  
Large Power

High shares of power from renewable resources in large power supply grids do not imply insurmountable technical problem anymore. A question is rather whether, besides the technical feasibility, it is also economically viable to go for a high share of power from sun, wind, water, geothermal resources and biomass. This paper scrutinizes the costs of a renewable-energy based power supply in the Java-Bali grid, by far the largest grid in Indonesia. The study refers to a challenging power supply scenario in which 100% of the power in the Java-Bali grid comes from renewable resources. This scenario is expressed in a one-year modeling of the load and the respective power supply in the grid. The modeling identifies possible sets of installed capacities of the different power plant types and storage systems that allow the supply of the required electricity. A cost scenario is applied to these sets, which renders the system costs, and finally the power generation costs. All scenarios refer to the year 2050. The results show that, assuming moderate financing costs, the cost of the electricity generation in the possible supply systems would not be higher than that in currently existing systems in developed countries; and it would even not be far away from the power generation cost in the current Java-Bali grid. A secondary result of the study is that the usage of special long-term storage systems for the balancing of seasonal power supply fluctuations, additionally to pumped storages and batteries, is not economically necessary in the considered grid.

scholarly journals Dimensioning Methodology of Energy Storage Systems for Power Smoothing in a Wave Energy Conversion Plant Considering Efficiency Maps and Filtering Control Techniques

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3380
Author(s):  
Jorge Torres ◽  
Marcos Blanco ◽  
Marcos Lafoz ◽  
Gustavo Navarro ◽  
Jorge Nájera ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Energy Conversion ◽  
Wave Energy ◽  
Storage Systems ◽  
Wave Energy Conversion ◽  
Energy Storage Systems ◽  
Control Techniques ◽  
Power Oscillations ◽  
Selection Of

This paper aims at presenting and describing a dimensioning methodology for energy storage systems (ESS), in particular for one based on flywheels, applied for the specific application of reducing power oscillation in a wave energy conversion (WEC) plant. The dimensioning methodology takes into account the efficiency maps of the storage technology as well as the effect of the filtering control techniques. The methodology is applied to the case study of a WEC plant in operation in Spain, using real power generation profiles delivered into the electric grid. The paper firstly describes the calculation procedure of the efficiency maps for the particular technology of flywheels, although it could be extended to other storage technologies. Then, the influence of using future data values in the dimensioning process and the control of the ESS operation is analysed in depth. A moving average filter (MAF) is defined to compensate for power oscillations, studying the difference between considering prediction and not doing so. It is concluded that a filtering control using future values based on a number of samples equivalent to a 4-min time order provides an important reduction in the energy storage requirements for a power generation plant. Finally, and based on the selection of storage modules previously defined, the efficiency maps, and the MAF used for delivering the power into the grid, an optimal operation strategy is suggested for the storage modules, based on a stepped switching technique. The selection of four flywheel energy storage system (FESS) modules achieves a reduction of 50% in power oscillations, covering 85% of the frequency excursions at the grid.

scholarly journals Electrical Energy Storage Using Flywheels

MRS Bulletin ◽  
2008 ◽  
Vol 33 (4) ◽  
pp. 419-420 ◽  
Author(s):  
M. Stanley Whittingham
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Kinetic Energy ◽  
Storage Systems ◽  
High Strength ◽  
Electrical Energy ◽  
Carbon Composites ◽  
Electrical Energy Storage ◽  
High Speeds ◽  
Very High

Flywheel energy storage systems use the kinetic energy stored in a rotor; they are often referred to as mechanical batteries. On charging, the fywheel is accelerated, and on power generation, it is slowed. Because the energy stored is proportional to the square of the speed, very high speeds are used, typically 20,000–100,000 revolutions per minute (rpm). To minimize energy loss due to friction, the rotors are spun in a vacuum and use magnetic bearings. The rotors today are typically made of high-strength carbon composites. One of the main limits to fywheels is the strength of the material used for the rotor: the stronger the rotor, the faster it can be spun, and the more energy it can store.

scholarly journals An Original Control Strategy of Storage Systems for the Frequency Stability of Autonomous Grids with Renewable Power Generation

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4391
Author(s):  
Mariano G. Ippolito ◽  
Fabio Massaro ◽  
Rossano Musca ◽  
Gaetano Zizzo
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Frequency Stability ◽  
Operating Conditions ◽  
Storage Unit ◽  
Renewable Power ◽  
Renewable Power Generation ◽  
Storage Units

This work examines the operation of the autonomous power system of a geographical island assuming the integration of significant generation shares from renewable energy sources and the installation of the required storage systems. The frequency stability of the system is investigated considering different operating conditions, in terms of load demand and renewable power generation. The main focus of the work is an original control strategy specifically designed for power converters interfacing storage units to the grid. The proposed strategy is based on an extended frequency droop control, which selects specific droop settings depending on the operating mode—charge or discharge—of the storage unit. A simulation model of the whole electrical system is developed for dynamic analysis. The model also implements the possibility of including specific auxiliary frequency controls for synthetic inertia and primary reserve. The results of the simulation and analysis indicate that the proposed control strategy has a significant positive effect, making the storage units able to provide a fundamental and more effective support to the frequency stability of the system. The application of the proposed control strategy to storage units also reduces the need for a contribution to the frequency control from intermittent and variable sources, making the whole system more robust, stable and reliable.

scholarly journals Challenge from Transpower: Determining the effect of the aggregated behaviour of solar photovoltaic power generation and battery energy storage systems on grid exit point load in order to maintain an accurate load forecast

2020 ◽  
Vol 60 ◽  
pp. M1-M40
Author(s):  
Catherine Zoe Wollaston Hassell Sweatman ◽  
N. Wichitaksorn ◽  
A. Jiang ◽  
Troy Farrell ◽  
N. Bootland ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Storage Systems ◽  
Exit Point ◽  
Solar Photovoltaic ◽  
Battery Energy Storage ◽  
Load Forecast ◽  
Photovoltaic Power ◽  
Battery Energy Storage Systems ◽  
Battery Energy

With limited data beyond the grid exit point (GXP) or substation level, how can Transpower determine the effect of the aggregated behaviour of solar photovoltaic power generation and battery energy storage systems on GXP load in order to maintain an accurate load forecast? In this initial study it is assumed that the GXP services a residential region. An algorithm based on non-linear programming, which minimises the financial cost to the consumer, is developed to model consumer behaviour. Input data comprises forecast energy requirements (load), solar irradiance, and pricing. Output includes both the load drawn from the grid and power returned to the grid. The algorithm presented is at the household level. The next step would be to combine the load drawn from the grid and the power returned to the grid from all the households serviced by a GXP, enabling Transpower to make load predictions. Various means of load forecasting are considered including the Holt--Winters methods which perform well for out-of-sample forecasts. Linear regression, which takes into account comparable days, solar radiation, and air temperature, yields even better performance.

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