New Technical Solutions to Remove Seasonal Restrictions of Thermal Power Plants and Increase Reliability and Efficiency of Power Systems During Summer Period

2019 ◽  
pp. 120-129
Author(s):  
V.A. Zubakin ◽  
◽  
F.Yu. Opadchiy ◽  
D.L. Dogadin ◽  
T.Yu. Uspenskaya ◽  
...  
Keyword(s):  
Power Systems ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Summer Period ◽  
Technical Solutions

scholarly journals Hydro-reservoir management and unit-commitment in energy optimization

2021 ◽  
Author(s):  
Flávio Leite Loução Junior ◽  
Marlon Sproesser Mathias ◽  
Claudia Sagastizábal ◽  
Luiz-Rafael Santos ◽  
Francisco Nogueira Calmon Sobral
Keyword(s):  
Power Systems ◽  
Demand Response ◽  
Power Plants ◽  
Unit Commitment ◽  
Thermal Power ◽  
Point Of View ◽  
Mixed Integer ◽  
Thermal Power Plants ◽  
Hydro Power ◽  
Optimal Dispatch

In partnership with CCEE, CEPEL and RADIX as industrial partners, in 2021 the study group focused on the dynamics of hourly prices when industrial consumers are demand responsive, as a follow-up of the industrial problem tackled in 2018 and 2019, on ``Day-ahead pricing mechanisms for hydro-thermal power systems''. Demand response is currently being tested by the Brazilian independent system operator and by the trading chamber, ONS. The program considers reductions of consumption of some clients as an alternative to dispatching thermal power plants out of the merit order. The day-ahead problem of finding optimal dispatch and prices for the Brazilian system is modelled as a mixed-integer linear programming problem, with non-convexities related to fixed costs and minimal generation requirements for some thermal power plants. The work focuses on the point of view of an individual hydro-power generator, to determine business opportunities related to adhering to a demand response program.

Pyrolysis-Bridged Hybrid Power Systems and Their Application for Thermal Power Plants

2014 ◽  
Vol 28 (10) ◽  
pp. 6531-6539 ◽  
Author(s):  
Yuzhe Li ◽  
Chuigang Fan ◽  
Wenli Song
Keyword(s):  
Power Systems ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Hybrid Power Systems ◽  
Hybrid Power

scholarly journals Experience in multistage steam-driven ejectors

2020 ◽  
Vol 178 ◽  
pp. 01002
Author(s):  
Ilia Murmanskii ◽  
Konstantin Aronson ◽  
Nickolay Zhelonkin ◽  
Alexander Ryabchikov ◽  
Adriano Milazzo ◽  
...  
Keyword(s):  
Power Plants ◽  
Design Method ◽  
Thermal Power ◽  
Geometrical Parameters ◽  
Thermal Power Plants ◽  
Design Solutions ◽  
Improved Design ◽  
Steam Parameters ◽  
Technical Solutions

The article presents some trends of multistage steam-driven ejectors improvement and examples of its implementation. Three relevant directions were picked out: increasing of reliability, profitability and efficiency. Regarding the reliability increasing, existing serial ejector designs of various manufactures were analyzed. A number of new technical solutions were designed. For profitability raising two approaches were considered: decreasing of primary steam parameters and effect of high ejector productivity to the vacuum deviation in the condenser. Efficiency increasing comprises jet devices improvement. For these reasons a design method was refined. In this case geometrical parameters of existing serial ejectors were summarized, CFD research was performed. The improved design method along with new design solutions are implemented in several ejectors successfully. New ejectors are set at thermal power plants and have shown a high technical-economical effect.

scholarly journals Electricity efficiency of auxiliary power systems in coal thermal power plant

2020 ◽  
Vol 11 (2) ◽  
pp. 101-110
Author(s):  
Azrina Mujanović ◽  
Tatjana Konjić ◽  
Adisa Dedić
Keyword(s):  
Power Plant ◽  
Power Systems ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Energy Sources ◽  
Thermal Power Plants ◽  
Auxiliary Power ◽  
Generator Output

Renewable energy sources such as hydro, wind and solar energy are taking an increasing share in the electricity mix. However, electricity production from thermal power plants is independent of the weather conditions and is still important as a back-up power source to renewable energy sources. Given the fact that the electricity market is open, it is clear that each MWh is important. Therefore, auxiliary power systems as a part of thermal power plants should be also energy efficient. The main aim of the presented research was to investigate the efficient operation of different consumers in the auxiliary power system in the old-dated thermal power plant ‘’Tuzla’’ depending on different power at generator output. The performed analysis identified consumers suitable for electricity efficiency improvement giving results of power savings obtained on modestly available measurements and old-date technical documentation. Following obtained results, some recommendations for improving electricity efficiency were proposed with a rough calculation of possible savings. Measurements of auxiliary power system consumption depending on power at generator output in new thermal power plant ‘’Stanari’’ was presented. Future trends and directions in thermal power plant automation were also discussed.

scholarly journals Internal Benchmarking of Thermal Power Plants оf Electric Power Systems

2020 ◽  
Vol 63 (6) ◽  
pp. 541-553
Author(s):  
E. M. Farhadzadeh ◽  
A. Z. Muradaliyev ◽  
Y. Z. Farzaliyev ◽  
U. K. Ashurova
Keyword(s):  
Power Systems ◽  
Electric Power ◽  
Coefficient Of Variation ◽  
Power Plants ◽  
Thermal Power ◽  
Electric Power Systems ◽  
Arithmetic Mean ◽  
Time Interval ◽  
Thermal Power Plants ◽  
Integral Indicator

Improving the operational efficiency (OE) of thermal power plants is one of the most important problems of electric power systems (EPS). According to modern concepts, efficiency is the simultaneous consideration of three properties of objects, viz. economy, reliability and safety. The methodology of their joint assessment assumes that the service life of the main equipment does not exceed the standard value, but this condition is now met by less than half of the production enterprises of a lot of EPS. In order to increase OE, it is necessary, first of all, to learn how to objectively compare the performance of objects both of the same type – in a given time interval, and unique ones – in adjacent intervals. Existing methods for calculating integrated performance indicators do not fully take into account the random nature of technical and economic indicators (TEI). The article presents a new method for comparing the OE of EPS objects, the essence of which is to switch from joint consideration of TEI to analysis of their relative changes in comparison with the factory default value (nominal value). Relative values of indicators characterize the amount of wear or residual life. In this case, for example, the arithmetic mean of the relative values of the TEI determines the average wear of the object. This physical representation enlivens integral indicators, and their comparison and ranking ceases to be science-intensive. It is proposed to take into account also the degree of variation of relative deviations (wear), which is adequate to the object’s misalignment. It manifests itself in a significant change (deterioration) of one or (less often) two relative values of the TEI in the calculated time interval (month) and is characterized by such statistical indicators as the geometric mean and the coefficient of variation of relative deviations. Herewith, if the arithmetic mean value of the object’s wear is restored during major repairs, then the misalignment is eliminated much faster – during current repairs. A necessary condition for the feasibility of using these or those integral indicators is their functional and statistical independence. The results of the studies performed using the simulation method made it possible to establish that the smallest correlation occurs between the integral indicator calculated as the arithmetic mean of random variables and the integral indicator calculated as the coefficient of variation of the same random variables. Comparison of correlation fields clearly confirms these conclusions.

scholarly journals The Challenges and Opportunities of Renewable Energy Source (RES) Penetration in Indonesia: Case Study of Java-Bali Power System

Energies ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5903 ◽  
Author(s):  
Handrea Bernando Tambunan ◽  
Dzikri Firmansyah Hakam ◽  
Iswan Prahastono ◽  
Anita Pharmatrisanti ◽  
Andreas Putro Purnomoadi ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Power System ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Thermal Power ◽  
Peak Load ◽  
Rate Capability ◽  
Thermal Power Plants ◽  
Pv Penetration

Nowadays, the integration of renewable energy sources, especially grid-connected photovoltaic, into electrical power systems, is increasing dramatically. There are several stimulants especially in the Java-Bali power system, including huge solar potential, a national renewable energy (RE) target, regulation support for prosumers, photovoltaic technology development, and multi-year power system planning. However, significant annual photovoltaic penetration can lead to critical issues, including a drop of netload during the day, ramping capability, and minimal load operation for thermal power plants. This study analyses the duck curve phenomenon in the Java-Bali power system that considers high shares of the baseload power plant and specific scenarios in photovoltaic (PV) penetration and electricity demand growth. This study also analyses future netload, need for fast ramping rate capability, and oversupply issues in the Java-Bali power system. The results showed that the duck curve phenomenon appears with a significant netload drop in the middle of the day because of high power generation from grid-connected PV. Furthermore, the need for fast ramp rate capability is critical for a higher peak load combined with the lowest netload valley. Moreover, the significant load growth with high grid-connected PV penetration level caused unit commitment issues for thermal power plants as baseload operators.

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