Renewable sources of energy

Mackillop, Andrew

doi:10.1016/0301-4215(88)90136-x

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Average load factors for different types of generator are given in the Digest of United Kingdom Energy Statistics (DUKES) Table 5.10 [1], however, these reflect the annual output against theoretical maximum output and do not take into account what capacity is on line at any given time. Table 1 presents the values used here, these estimates based on DUKES data [1], assumptions about minimum load and the need for spinning reserve. The system inertia Es can be calculated from:…”

Section: Load Profile Developmentmentioning

confidence: 99%

“…Where, is the generator power output for each generator type (i) at each model timestep, is the assumed average load factor for the type of generator and. is the typical unit capacity (estimated from DUKES station data [1] and number of units at each site) and the associated inertia constant. By rounding up the number of generators to the nearest integer, gives an estimate of the total system inertia based on the expected number of units of each type on line at each timestep; this figure is most frequently quoted in 'GVA.s' in industrial publications.…”

Section: Load Profile Developmentmentioning

confidence: 99%

“…Many renewable generators, particularly solar and wind, either have no inherent inertia, being inverter connected, or reduced inertia as a result of being small, light-weight and often non-synchronous, machines. The UK electricity grid has seen the contribution from renewables grow from under 5% in 2004 to around 25% in 2016 [1], that proportion is expected to continue to grow [2] as the UK aims to meet its climate change targets. Several papers have been published that examine various forms of frequency response in consideration of the increase in low inertia renewable generation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A closed-loop analysis of grid scale battery systems providing frequency response and reserve services in a variable inertia grid

et al. 2019

View full text Add to dashboard Cite

With increasing penetration of wind and solar generation the deployment of fast response plant, principally batteries, is currently considered necessary to mitigate reduced system inertia and the possibility of demandsupply imbalances. In this work the impact of these factors on battery cycling rates, taking into account the input from the batteries themselves, are analysed by applying the swing equation to a future inertia based on forecast generation mix. The operational capacity of batteries is a determining factor in their cycling rate, though the depth of discharge appears to be less well correlated. It is found that reducing system inertia does not, of itself, significantly impact on frequency volatility where the volatility of the generation to load imbalance is unchanged. However, the potential for a reduction in the damping of frequency deviations as a result of an increase in inverter connected motor drives may have a large impact on battery cycling characteristics. Provision of reserve services from battery systems requires a more complex operational strategy to ensure services are always deliverable and results in a significantly different cycling profile that may lead to greater battery degradation and consequently higher operational costs.

show abstract

Section: Load Profile Developmentmentioning

confidence: 99%

Section: Load Profile Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A closed-loop analysis of grid scale battery systems providing frequency response and reserve services in a variable inertia grid

et al. 2019

View full text Add to dashboard Cite

show abstract

Energy Storage Sizing Strategy for Grid-Tied PV Plants under Power Clipping Limitations

et al. 2019

View full text Add to dashboard Cite

This paper presents an analyses of an Energy Storage System (ESS) for grid-tied photovoltaic (PV) systems, in order to harness the energy usually lost due to PV array oversizing. A real case of annual PV power generation analysis is presented to illustrate the existing problem and future solutions. Three PV modeling techniques have been applied to estimate non-measured non-harnessed PV power to provide an ESS energy and power sizing strategy. Moreover, a control strategy to store or release power from the DC-link, without modifying the Maximum Power Point Tracking (MPPT) strategy, is presented. The results show an estimation of the annual power loss caused by oversizing the PV array. The ESS sizing strategy gives insight into not only the energy requirements, but also the power requirements of the system. Simulation results show that the proposed ESS control strategy is capable of harnessing the extra power without modifying the existing power converter of the PV plant nor its control strategy.

show abstract

Renewable sources of energy

Cited by 2 publications

References 0 publications

A closed-loop analysis of grid scale battery systems providing frequency response and reserve services in a variable inertia grid

A closed-loop analysis of grid scale battery systems providing frequency response and reserve services in a variable inertia grid

Energy Storage Sizing Strategy for Grid-Tied PV Plants under Power Clipping Limitations

Contact Info

Product

Resources

About