Mitigating the Variability of Wind and Solar Energy Through Pumped Hydroelectric Storage

2012 ◽  
Author(s):  
S. Richards ◽  
H. Perez-Blanco
Keyword(s):  
Power Generation ◽  
Solar Power ◽  
Power Production ◽  
Electricity Demand ◽  
Excess Energy ◽  
Renewable Generation ◽  
Electric Grid ◽  
Operational Strategies ◽  
Renewable Power ◽  
Generating Capacity

Renewable power production is both variable and difficult to forecast accurately. These facts can make its integration into an electric grid problematic. If an area’s demand for electricity can be met without using renewable generation, the addition of renewable generation would not warrant a further increase in generation capacity. However, to effectively integrate large amounts of additional renewable generation, it is likely that a more flexible generation fleet will be required. One way of increasing a generation fleet’s flexibility is through the adoption of pumped hydroelectric storage (PHS, see the glossary for definitions of select terms). Like traditional hydropower generation, PHS is capable of quickly varying its power output but it is also capable of operating in reverse to store excess energy for later use. This paper will address many of the operational aspects of combining pumped hydroelectric storage (PHS), which is currently used to store excess energy from traditional generators, with wind and solar power generation. PJM, a grid operator in the Middle Atlantic States, defines capacity value for renewable generation as the percent of installed generating capacity that the generator can reliably contribute during summer peak hours. Existing wind generators inside PJM have an average capacity value of 13% and existing solar generators have a capacity value of 38%. The chief reason for these capacity values is that the renewable power production does not usually coincide with the hours of peak electricity demand during the summer. If PHS were used to firm renewable power generation, it would translate into increased utilization of the renewable generation that would displace the least efficient/most costly generators. A computer model with one minute granularity is constructed in order to study the operational requirements of PHS facilities. PJM electricity demand, power prices, and wind power production data for 2010 were used in conjunction with NREL simulated solar power production as input to the model. Currently, various PHS operational strategies are being tested to ascertain their effectiveness at firming and time shifting renewable generation. Preliminary results show the profound effects of increased penetration of renewable energy on an electric grid. The results also demonstrate a niche for even greater PHS operational flexibility, i.e. variable speed or unidirectional ternary machine (UTM) PHS.

scholarly journals Use of Solar Power Production for Point-of-Care Ultrasound: A Comparative Analysis

2019 ◽  
Vol 34 (s1) ◽  
pp. s96-s97
Author(s):  
John Gallien ◽  
Ashley Sullivan
Keyword(s):  
Power Generation ◽  
Solar Power ◽  
Point Of Care ◽  
Lithium Ion ◽  
Point Of Care Ultrasound ◽  
List Type ◽  
Actual Performance ◽  
Solar Power Generation ◽  
Resource Limited ◽  
Generating Capacity

Introduction:Use of Point-of-Care Ultrasound (US) has grown considerably in resource-limited and wilderness environments because of a combination of features, including portability, durability, and safety. However, the optimal method of powering US devices in such environments is not well established.Aim:This project has the following aims: 1.Develop a solar power generation and storage system that maximizes power capacity and minimizes weight while being easily transportable by a single person.2.Test the system in a real-world environment to evaluate actual performance relative to stated performance.3.Determine the approximate US scan-time where solar systems would outperform pre-charged batteries with respect to weight.Methods:We developed multiple solar collecting systems using a combination of polycrystalline, monocrystalline, and thin-film solar arrays paired with different powerbanks and tested them using a variety of US systems. From this, the duration of usage was calculated, which makes the solar power generation system a superior option to pre-charged batteries.Results:Lithium-ion energy storage was found to be superior to lead-acid batteries for multiple reasons, most prominently, weight. Several models of US systems were tested revealing that portable US systems consume between 30 to 50 watts. Tri-fold monocrystalline solar panels coupled with lithium-ion powerbanks provided the best combination of weight and transportability. Total weight of the combined solar array, powerbank, and US system is 10 kilograms and easily packs into a backpack carrier. It was found that systems using solar generating capacity become superior to pre-charged powerbanks in regard to weight at approximately 14 hours of scanning time.Discussion:While these results are not fully generalizable due to seasonal and geographic variability as well as the type of US system used, use of solar generating capacity to power US systems is optimal for extended durations of use in resource-limited environments.

Solar Photovoltaic Technology—A Review

2020 ◽  
Vol 12 (1) ◽  
pp. 5-10 ◽  
Author(s):  
Praveen Kumar Mishra ◽  
Prabhakar Tiwari
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Alternative Energy ◽  
Solar Power ◽  
Solar Photovoltaic ◽  
Tropical Zone ◽  
Renewable Power ◽  
Photovoltaic Technology ◽  
Alternative Sources ◽  
Materials Used

With growing the necessity of alternative energy, this demand will be lead to in the interest of solar research in order to extend the properties containing concentration, charge transfer, absorption and charge separation of solar cell devices along with materials. The solar energy are most abundant, infinite, inexhaustible and clean among all the renewable power resources till now. It can be used by various techniques such as making full use of sunlight to directly generate electricity or by using heat from the sun as a thermal energy. The Photovoltaic technologies are one of the best ways to harness the solar power. The aforementioned one script reviews the photovoltaic technology, its power producing efficiency, the different actual light appealing materials used, its substantial prospect as well various its applications. The Photovoltaic (PV) power generation are one of the most promising power generation among others alternative sources. In this literature survey, we summarize the significance of solar photovoltaic power generation. Solar power generation is likely one of the well-known sectors to give a boost to the sustainability of India. Solar power has giant capability in India due to that it lies in tropical zone. The Solar energy are on the pace to become the fastest rising energy sources in human history.

scholarly journals Exploring Wind and Solar PV Generation Complementarity to Meet Electricity Demand

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4132 ◽  
Author(s):  
António Couto ◽  
Ana Estanqueiro
Keyword(s):  
Power Systems ◽  
Power System ◽  
Solar Power ◽  
Extreme Values ◽  
System Development ◽  
Power Source ◽  
Electricity Demand ◽  
Energy Deficit ◽  
Solar Pv ◽  
Renewable Power

Understanding the spatiotemporal complementarity of wind and solar power generation and their combined capability to meet the demand of electricity is a crucial step towards increasing their share in power systems without neglecting neither the security of supply nor the overall cost efficiency of the power system operation. This work proposes a methodology to exploit the complementarity of the wind and solar primary resources and electricity demand in planning the expansion of electric power systems. Scenarios that exploit the strategic combined deployment of wind and solar power against scenarios based only on the development of an individual renewable power source are compared and analysed. For each scenario of the power system development, the characterization of the additional power capacity, typical daily profile, extreme values, and energy deficit are assessed. The method is applied to a Portuguese case study and results show that coupled scenarios based on the strategic combined development of wind and solar generation provide a more sustainable way to increase the share of variable renewables into the power system (up to 68% for an annual energy exceedance of 10% for the renewable generation) when compared to scenarios based on an individual renewable power source. Combined development also enables to reduce the overall variability and extreme values of a power system net load.

Correlations Between Geographically Dispersed Concentrating Solar Power and Demand in the United States

2010 ◽  
Author(s):  
Matthew Mowers ◽  
Chris Helm ◽  
Nate Blair ◽  
Walter Short
Keyword(s):  
Wind Power ◽  
Solar Power ◽  
Thermal Power ◽  
The United States ◽  
Electricity Demand ◽  
Geographically Dispersed ◽  
Renewable Power ◽  
Hourly Data ◽  
High Renewable Penetration ◽  
Utility Scale

Correlations between the electricity generated by concentrating solar thermal power (CSP) plants, as well as cross-correlations between CSP, wind power and electricity demand, have significant impacts on decisions for how much and where to build utility-scale CSP capacity, the optimal amount of thermal storage in the CSP plants, reserve capacity needed to back-up the system, as well as the expected levels of curtailed renewable power. Accurately estimating these correlations is vital to performing detailed analyses of high renewable penetration scenarios. This study quantifies the degree of correlation between geographically dispersed CSP, as well as the correlation between CSP and wind power, and CSP and electricity demand in 356 discrete regions in the contiguous US. Correlations are calculated using hourly data on an annual basis. Maps of the correlations will be presented to illustrate the degree of correlation between solar power and the demand it is serving, as well as the synergies between the negatively-correlated wind power and solar power serving the same region.

PEMBANGKIT LISTRIK TENAGA HIBRID SEBAGAI SOLUSI KELISTRIKAN DI DAERAH TERPENCIL

2013 ◽  
Vol 14 (2) ◽  
Author(s):  
Agus Nurrohim
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Solar Power ◽  
Oil Prices ◽  
Electricity Demand ◽  
Hybrid Power ◽  
Eastern Indonesia ◽  
Government Planning ◽  
The Government

In order to meet electricity demand, the role of Diesel Power Generation (PLTD) in parts of Indonesia is still very large. Currently, 34.30% of electricity demand in outside of Java-Bali system was supplied by the PLTD. Especially for the Eastern Indonesia (Nusa Tenggara, Maluku, and Papua), nearly 100% of its electricity comes from PLTD. For the next 10 years, the government planning through PT. PLN will install 252 MW of PLTD in Eastern Indonesia and 73 MW in Western Indonesia. Due to the increasing of oil prices in the world will directly increase the oil prices in Indonesia, so that the electricity generating cost from PLTD would alsoincrease. To reduce fuel consumption without reducing the service to the consumer, the construction of Diesel Power Generation should be integrated with renewable energy, like Solar Power and Wind Power to form the Hybrid Power Generation. By the Hybrid Power Generation, energy management can be controlled, so the using of diesel fuel can be more efficient. By applying of Solar Power and Wind Power in a quarter of the capacity of PLTD, the consumption of fuel could be reduced by 152million liters up to 2019, or an average of 15.2 million liters per year.

scholarly journals The smoothing effect for renewable resources in an Afro-Eurasian power grid

2017 ◽  
Vol 14 ◽  
pp. 253-260 ◽  
Author(s):  
Maria Krutova ◽  
Alexander Kies ◽  
Bruno U. Schyska ◽  
Lueder von Bremen
Keyword(s):  
Power Systems ◽  
Renewable Resources ◽  
Power Transmission ◽  
Excess Energy ◽  
Weather Data ◽  
Smoothing Effect ◽  
Renewable Generation ◽  
Transmission Grid ◽  
Renewable Power ◽  
Variable Generation

Abstract. Renewable power systems have to cope with highly variable generation. Increasing the spatial extent of an interconnected power transmission grid smooths the feed-in by exchange of excess energy over long distances and therefore supports renewable power integration. In this work, we investigate and quantify the balancing potential of a supergrid covering Europe, Africa and Asia. We use ten years of historical weather data to model the interplay of renewable generation and consumption and show that a pan-continental Afro-Eurasian supergrid can smooth renewable generation to a large extent and reduce the need for backup energy by around 50 %. In addition, we show that results for different weather years vary by up to approximately 50 %.

Mideast states will show mixed progress on renewables

2018 ◽  
Keyword(s):  
Energy Source ◽  
Power Generation ◽  
Saudi Arabia ◽  
Renewable Energy ◽  
United Arab Emirates ◽  
Solar Power ◽  
Political Leaders ◽  
Energy Subsidies ◽  
Content Type ◽  
Renewable Power

Significance The project aims to generate up to 200 gigawatts by 2030, creating 100,000 jobs in Saudi Arabia. Renewable energy was also a key focus in the United Arab Emirates (UAE), at its ‘Sustainability Week’ in January, one of the largest gatherings of business and political leaders in the region for this purpose, which highlighted an IHS forecast that solar power would rank third as an energy source in the region by 2035. Impacts Countries eliminating energy subsidies will attract the most investment in renewables. Natural gas will remain the regional fuel of choice for power generation through to 2035, increasing its share in the energy mix. Solar is likely to overtake hydropower as the largest source of renewable power in the Middle East by 2035. Even by 2035, solar power (both photovoltaic and concentrated) will still account for less than 6% of power generation.

Renewable energy capacity will rise with costs falling

2020 ◽  
Keyword(s):  
Power Generation ◽  
Fossil Fuel ◽  
Offshore Wind ◽  
Power Sector ◽  
Onshore Wind ◽  
Content Type ◽  
Renewable Power ◽  
Fuel Demand ◽  
Generating Capacity ◽  
Paris Climate Agreement

Significance Governments are formulating their environmental policies in line with the Paris climate agreement and falling costs make renewables the cheapest option for new generating capacity. Solar and onshore wind are the cheapest forms of power generation and offshore wind is expected to be subsidy-free within five years. Impacts The need to integrate rapid-response energy generation, and to meet new demand forms, will focus attention on boosting system flexibility. Fossil fuel demand for power generation is likely to peak early in countries seeking rapid energy transitions. Enhanced planning and staffing capabilities will be needed to encourage investment at the scale the renewable power sector will require.

Renewable Power Generation Management: Case Study – Nakhonratchasima Province, Thailand

2013 ◽  
Vol 734-737 ◽  
pp. 1747-1751
Author(s):  
Sureeporn Meehom ◽  
Wipanan Iaprasert ◽  
Thanatchai Kulworawanichpong
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Power Plant ◽  
Electric Energy ◽  
Electricity Demand ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Energy Potential ◽  
Renewable Power ◽  
Renewable Power Generation

Electricity is a pre-requisite for technological progress and economy growth. Thailand has been facing an electric energy crisis in inadequate electricity generation capacity compared with the demand. It is essential to replace the conventional energy (e.g. fossil fuels) with renewable energy resources, particularly biomass that can play a major role to meet the electricity demand. A modified deming PDCA management has been proposed for power generation. The objective of this study is to evaluate the future electricity consumption as well as to explore the current state of renewable energy potential in Nakhonratchasima Province, Thailand. The results show an electricity energy potential of from agricultural residues, livestock manure and solar energy resources. It is indicated that each these resources can supply the electricity demand excesses. The selection of renewable power generation is mainly driven by the installation cost and the availability of renewable energy resources. The power plant from livestock manures resources is found to be the most promising because its power plant installation requires lower investment in this study.

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