scholarly journals Annual Assessment of Large-Scale Introduction of Renewable Energy: Modeling of Unit Commitment Schedule for Thermal Power Generators and Pumped Storages

Energies ◽  
2017 ◽  
Vol 10 (6) ◽  
pp. 738 ◽  
Author(s):  
◽  
◽  
◽  
◽  
◽  
...  
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Unit Commitment ◽  
Thermal Power ◽  
Energy Modeling ◽  
Power Generators

scholarly journals Two-Stage Optimal Scheduling of Large-Scale Renewable Energy System Considering the Uncertainty of Generation and Load

2020 ◽  
Vol 10 (3) ◽  
pp. 971 ◽  
Author(s):  
Xiangyu Kong ◽  
Shuping Quan ◽  
Fangyuan Sun ◽  
Zhengguang Chen ◽  
Xingguo Wang ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Demand Response ◽  
Large Scale ◽  
Thermal Power ◽  
Estimation Method ◽  
Point Estimation ◽  
Low Carbon ◽  
System Operation ◽  
Two Stage ◽  
Point Estimation Method

With the development of smart grid and low-carbon electricity, a high proportion of renewable energy is connected to the grid. In addition, the peak-valley difference of system load increases, which makes the traditional grid scheduling method no longer suitable. Therefore, this paper proposes a two-stage low-carbon economic scheduling model considering the characteristics of wind, light, thermal power units, and demand response at different time scales. This model not only concerns the deep peak state of thermal power units under the condition of large-scale renewable energy, but also sets the uncertain models of PDR (Price-based Demand Response) virtual units and IDR (Incentive Demand Response) virtual units. Taking the system operation cost and carbon treatment cost as the target, the improved bat algorithm and 2PM (Two-point Estimation Method) are used to solve the problem. The introduction of climbing costs and low load operating costs can more truly reflect the increased cost of thermal power units. Meanwhile, the source-load interaction can weigh renewable energy limited costs and the increased costs of balancing volatility. The proposed method can be applied to optimal dispatch and safe operation analysis of the power grid with a high proportion of renewable energy. Compared with traditional methods, the total scheduling cost of the system can be reduced, and the rights and obligations of contributors to system operation can be guaranteed to the greatest extent.

scholarly journals Unit Commitment Accommodating Large Scale Green Power

2019 ◽  
Vol 9 (8) ◽  
pp. 1611 ◽  
Author(s):  
Yuntao Ju ◽  
Jiankai Wang ◽  
Fuchao Ge ◽  
Yi Lin ◽  
Mingyu Dong ◽  
...  
Keyword(s):  
Wind Power ◽  
Nuclear Power ◽  
Large Scale ◽  
Unit Commitment ◽  
Thermal Power ◽  
Clean Energy ◽  
Reserve Capacity ◽  
Spinning Reserve ◽  
Peak Shaving ◽  
Generation Unit

As more clean energy sources contribute to the electrical grid, the stress on generation scheduling for peak-shaving increases. This is a concern in several provinces of China that have many nuclear power plants, such as Guangdong and Fujian. Studies on the unit commitment (UC) problem involving the characteristics of both wind and nuclear generation are urgently needed. This paper first describes a model of nuclear power and wind power for the UC problem, and then establishes an objective function for the total cost of nuclear and thermal power units, including the cost of fuel, start-stop and peak-shaving. The operating constraints of multiple generation unit types, the security constraints of the transmission line, and the influence of non-gauss wind power uncertainty on the spinning reserve capacity of the system are considered. Meanwhile, a model of an energy storage system (ESS) is introduced to smooth the wind power uncertainty. Due to the prediction error of wind power, the spinning reserve capacity of the system will be affected by the uncertainty. Over-provisioning of spinning reserve capacity is avoided by introducing chance constraints. This is followed by the design of a UC model applied to different power sources, such as nuclear power, thermal power, uncertain wind power, and ESS. Finally, the feasibility of the UC model in the scheduling of a multi-type generation unit is verified by the modified IEEE RTS 24-bus system accommodating large scale green generation units.

scholarly journals Flexibility Based Day-Ahead Generation–Reserve Bilevel Decision Model

2019 ◽  
Vol 9 (9) ◽  
pp. 1755
Author(s):  
Yan Li ◽  
Ming Zhou
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Decision Model ◽  
Large Scale ◽  
Unit Commitment ◽  
Reserve Capacity ◽  
Proposed Model ◽  
Random Failure ◽  
Upper Level ◽  
Fluctuating Wind

With the increasing penetration rate of renewable energy like fluctuating wind and solar energy, the power system has to equip itself with a more reasonable reserve capacity. Therefore, how to quantify the reserve capacity needed for dealing with the uncertainty and fluctuation has turned out to be a new problem faced by the power system integrated with large-scale renewable energy. This paper proposes a flexibility based day-ahead generation–reserve bilevel decision model. In the upper level, the day-ahead unit commitment model is constrained by flexibility reserve, which is calculated in the lower level. In the lower level, taking into account various factors of uncertainty and fluctuation, e.g., wind power ramping, load ramping and random failure of conventional units, the ramping probability distribution of an equivalent system is obtained by the universal generating function method, then the quantified relationship between operating reserve and flexibility is established ultimately. If the unit commitment scheme gained from the upper level could not provide sufficient reserve, a feedback for the correction of the upper level is needed. The rationality and validity of the proposed model are verified through the simulation of a modified IEEE-118 bus system.

scholarly journals Renewable Energy Resources Hybridization as an Efficient and Cost-Effective Alternative for Electrification

2021 ◽  
Vol 18 (3) ◽  
pp. 174-183
Author(s):  
K.R. Kamil ◽  
A.O. Yusuf ◽  
S.A. Yakubu ◽  
S.B. Seriki
Keyword(s):  
Renewable Energy ◽  
Large Scale ◽  
Fossil Fuels ◽  
Greenhouse Gas Emission ◽  
Global Climate ◽  
Thermal Power ◽  
Cost Effective ◽  
Simulation Software ◽  
Renewable Energy Resources ◽  
Energy Potential

Majority of electricity generation in Nigeria comes from fossil fuels, with about two-thirds of thermal power derived from natural gas and the rest from oil, resulting in the emission of carbon dioxide (𝐶𝑂2). With the prevailing global climate change, shifting to renewable energy would reduce the greenhouse gas emission which would be the salvaging option to help our degrading environment. The aim of the resource’s hybridization process is to generate enough electricity that would help the supplementing for the inadequate electricity supply in the local province at the least detrimental effect on the environment. This work discusses the renewable energy potential of Nigeria and raises the possibility of having Nigeria electricity grid powered by small, medium and large-scale renewable energy systems. The hybridised power generation system simulations were done using HOMER simulation software. The hybridisation of the resources was able to generate 149,313 kWh/yr to adequately sustain the estimated electrical load of 126,027kWh/yr. Conclusively, cost effectiveness of the individual and hybridised systems was also considered.

scholarly journals Optimal Unit Commitment by Considering High Penetration of Renewable Energy and Ramp Rate of Thermal Units-A case study in Taiwan

2019 ◽  
Vol 9 (3) ◽  
pp. 421 ◽  
Author(s):  
Shiue-Der Lu ◽  
Meng-Hui Wang ◽  
Ming-Tse Kuo ◽  
Ming-Chang Tsou ◽  
Rui-Min Liao
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Large Scale ◽  
Unit Commitment ◽  
Computation Time ◽  
Power Grids ◽  
Mixed Integer ◽  
Ramp Rate ◽  
Priority List ◽  
Generation Cost

When large amounts of wind power and solar photovoltaic (PV) power are integrated into an independent power grid, the intermittent renewable energy destabilizes power output. Therefore, this study explored the unit commitment (UC) optimization problem; the ramp rate was applied to solve problems with 30 and 10 min of power shortage. The data of actual unit parameters were provided by the Taiwan Power Company. The advanced priority list method was used together with a combination of a generalized Lagrangian relaxation algorithm and a random feasible directions algorithm to solve a large-scale nonlinear mixed-integer programming UC problem to avoid local and infeasible solutions. The results showed that the proposed algorithm was superior to improved particle swarm optimization (IPSO) and simulated annealing (SA) in terms of the minimization of computation time and power generation cost. The proposed method and UC results can be effective information for unit dispatch by power companies to reduce the investment costs of power grids and the possibility of renewable energy being disconnected from the power system. Thus, the proposed method can increase the flexibility of unit dispatch and the proportion of renewable energy in power generation.

Nature based solutions against environmental risks: biodegradable geosynthetics

2021 ◽  
Author(s):  
Magdalena Bostenaru ◽  
Maria Bostenaru Dan
Keyword(s):  
Renewable Energy ◽  
Green Infrastructure ◽  
Large Scale ◽  
Thermal Power ◽  
Point Of View ◽  
High Tech ◽  
Geophysical Research ◽  
Ruhr Area ◽  
Industrial Buildings ◽  
Waste Dumps

<p>Landslides threaten transportation ways infrastructure, ex. after deforestation. Geotextiles on mountain sites were observed in France, including at the COST action TU1401 "Renewable energy and landscape quality"  (COST RELY) final conference which at the UNESCO geoheritage of Chaîne des Puys (Pidon et al, 2016), presented in the EGU geoheritage sessions as well. This paper presents research on biodegradable geosynthetics which are also able to stabilise ground in a different large scale setting after laboratory setting. The large scale setting is stabilisation of flying ash at the thermo power of Mintia and Doicesti in Romania (Siminea and Bostenaru, 2008, Bostenaru et al, 2010), right before closure. Nature based solutions gained attention in the last decade and the blue-green infrastructure approach is reevaluated in this presentation. Preda (2011) dealt with the degradation of soil in these two locations. Pleasea (2011) dealt with how to reactivate the industrial rural area of the Doicesti thermal power as alternative to demolition, which however happened late 2020. The location of both Mintia and Doicesti is examined also from the point of view of the vicinities (the former court archeological remains in Doicesti and the neighbouring Targoviste and the castle ruins and Modernist architecture in Deva near which Mintia is). Another reevaluation is the turn towards renewable energy (see COST RELY). With this turn thermopower, one of the most important in Romania along with hydropower which has been examined in the action, needs to be rethought. The IBA Emscher Park (Shaw, 2002, Bostenaru, 2007) in the Ruhr area in Germany was a participative large scale retrofit in the 1990s of a former coal mining region and therefore the high tech renewable energy among converted industry buildings, some of which UNESCO heritage. Experience in urban renewal of industrial buildings in Germany will be compared with success stories in water industry connected to slope greening at the water works in Suceava.</p><p>References:</p><p>Bostenaru Dan, M. (2007): Von den Partizipationsmodellen der 70er Jahre zu Kommunikationsformen Ende des XXten Jahrhunderts in Architektur und Städtebau, Cuvillier, Göttingen.</p><p>Bostenaru M., Siminea I., Bostenaru Dan M. (2010): Use of geotextiles for mitigation of the effects of man-made hazards such as greening of waste deposits in frame of the conversion of industrial areas, Geophysical Research Abstracts 12, EGU2010-13293.</p><p>Pidon A., Niemiec D., Sabourault P.  (2016): Mise en sécurité d’un dépôt de résidus detraitement de minerai de plomb-argentifère, Pontgibaud, Auvergne. Journées Nationalesde Géotechnique et de Géologie de l’Ingénieur, Nancy, France</p><p>Plesea, S. M. (2019): Potentialul zonelor industriale abandonate in context rural, master dissertation, "Ion Mincu" University of Architecture and Urbanism.</p><p>Preda C.-E. (2011): Impactul poluantilor produsi de termocentralele pe carbune asupra solurilor. Studii de caz: termocentralele Doicesti, Rovinari si Mintia, doctoral dissertation, University of Bucharest, Faculty of Geography.</p><p>Siminea I., Bostenaru M. (2008): Biodegradable geocomposite a material for the future,to be applied in slope protection and recovery of waste dumps, Scientific Bulletin of“Politehnica” University of Timişoara, Romania Transactions on Hydrotehnics 53/67(1), pp. 75-78</p><p>Shaw, R. (2002): The International Building Exhibition (IBA) Emscher Park, Germany:A Model for Sustainable Restructuring?, European Planning Studies, 10(1), pp. 77-97</p>

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