Optimization of renewable energy for buildings with energy storages and 15-minute power balance

On the territory of the Ryazan region, there are currently five 5 power plants with an installed electric capacity of 3,759 megawatt, including two gas turbine thermal power plants, which partially use an alternative fuel of the first generation (biogas) obtained from recycled organic waste through their processing. Experiments on conversion the gas turbine power plants to alternative fuels are being carried out. (Research purpose) The research purpose is to determine the power balance and reliability indicators of power plants based on renewable energy in the power system of the Ryazan region. (Materials and methods) Authors have investigated two gas turbine thermal power plants in the Ryazan power system in Sasovo and Kasimov. The reliability indicators of the gas turbine station equipment were calculated. (Results and discussion) Due to the commissioning of the second stage of the gas turbine power plant in Sasovo and its transfer to alternative sources, authors predict an increase in the growth of electricity generation. Authors considered the system reliability of the gas turbine station. (Conclusions) Analysis of power and electricity balances of power plants based on renewable energy in the power system of the Ryazan region showed that their share in the total electricity generation does not exceed one percent. It was determined that the probability of failure-free operation of electrical equipment lies in the range from 0.9 to 0.98. It was found that the probability of failure-free operation of the equipment included in the high voltage switchgear (10 kilovolts) lies below the standard and is up to 0.93. It was revealed a high probability of failure-free operation of step-up transformers up to 0.99, switching and protective equipment as part of a low voltage switchgear from 0.93 to 0.98. It was found that the transfer of gas-turbine stations to alternative fuel (biogas) obtained from recycled organic waste, will not cause a decrease in the reliability of power supply, since the estimated probability of failure-free operation of the equipment corresponds to or exceeds the normative value of 0.95, and the recovery time does not exceed 2.82 hours.

Download Full-text

Generation Expansion Planning with Energy Storage Systems Considering Renewable Energy Generation Profiles and Full-Year Hourly Power Balance Constraints

Energies ◽

10.3390/en14185733 ◽

2021 ◽

Vol 14 (18) ◽

pp. 5733

Author(s):

Radhanon Diewvilai ◽

Kulyos Audomvongseree

Keyword(s):

Renewable Energy ◽

Energy Storage ◽

System Reliability ◽

Storage Systems ◽

Computational Effort ◽

Power Balance ◽

Generation Expansion Planning ◽

Expansion Planning ◽

Generation Expansion ◽

Renewable Energy Generation

This paper proposes a methodology to develop generation expansion plans considering energy storage systems (ESSs), individual generation unit characteristics, and full-year hourly power balance constraints. Generation expansion planning (GEP) is a complex optimization problem. To get a realistic plan with the lowest cost, acceptable system reliability, and satisfactory CO2 emissions for the coming decades, a complex multi-period mixed integer linear programming (MILP) model needs to be formulated and solved with individual unit characteristics along with hourly power balance constraints. This problem requires huge computational effort since there are thousands of possible scenarios with millions of variables in a single calculation. However, in this paper, instead of finding the globally optimal solutions of such MILPs directly, a simplification process is proposed, breaking it down into multiple LP subproblems, which are easier to solve. In each subproblem, constraints relating to renewable energy generation profiles, charge-discharge patterns of ESSs, and system reliability can be included. The proposed process is tested against Thailand’s power development plan. The obtained solution is almost identical to that of the actual plan, but with less computational effort. The impacts of uncertainties as well as ESSs on GEP, e.g., system reliability, electricity cost, and CO2 emission, are also discussed.

Download Full-text

Electric Vehicle Penetration in Distribution Network: A Swedish Case Study

Applied System Innovation ◽

10.3390/asi2030019 ◽

2019 ◽

Vol 2 (3) ◽

pp. 19 ◽

Cited By ~ 1

Author(s):

Maninnerby ◽

Bergerland ◽

Lazarou ◽

Theocharis

Keyword(s):

Renewable Energy ◽

Solar Cells ◽

Electric Vehicle ◽

Electric Vehicles ◽

Distribution System ◽

District Heating ◽

Energy Sources ◽

Power Balance ◽

High Penetration

This study aims to simulate the use of renewable energy in the form of different energy sources, such as solar cells, district heating, and in the presence of battery storage and for high penetration of electric vehicles in a typical Swedish power grid. The EnergyPLAN software is used. The purpose is to examine the demands in order to cope with the needs that may arise and to create a better understanding of how renewable energy affects the power balance and future investments in the case of a typical Swedish distribution system. The importance of this research is mainly based on the fact that it represents a real network, as it operates today, which is analyzed using the expected electric vehicle penetration. The aim is to investigate the expansion needs for maintaining the current quality for service despite the addition of new loads. In addition, the regional and national special regulatory and operational requirements are taken into account and described in this work.

Download Full-text

Power Balance Management of an Autonomous Hybrid Energy System Based on the Dual-Energy Storage

Energies ◽

10.3390/en12244690 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4690

Author(s):

Sergey Obukhov ◽

Ahmed Ibrahim ◽

Mohamed A. Tolba ◽

Ali M. El-Rifaie

Keyword(s):

Renewable Energy ◽

Energy Storage ◽

Power Supply ◽

Renewable Energy Sources ◽

Energy Systems ◽

Energy System ◽

Power Balance ◽

Hybrid Energy ◽

Hybrid Power ◽

High Penetration

The urgent task of modern energy is to ensure reliable and efficient power supply to consumers, even those located in remote, far end places. A hybrid energy system with renewable energy sources is a promising way to ensure such a process. A characteristic feature of the modes of such systems, especially with high penetration levels of renewable energy sources, is the presence of ripples in the charge–discharge currents of the batteries used as energy storage devices. Batteries operation with such current fluctuations leads to rapid degradation of its characteristics as well as a reduction in its lifetime. Furthermore, it leads to a decrease in the reliability of the power supply system and an increase in the cost of generated electricity. A significant drawback of hybrid systems built according to well-known standard schemes is the inefficient use of the primary renewable energy, which is especially critical for energy systems located geographically in areas with severe climatic conditions. This article proposes a new construction method and an algorithm for controlling the modes of hybrid energy systems based on a dual-circuit energy storage device, which increases their reliability and energy efficiency. The prominent outcomes of operating modes of a hybrid power plant with a high penetration of renewable sources are presented, which proves that the proposed method of construction and the proposed control algorithm provide reliable and efficient control of the power balance of the hybrid power system in all possible operating conditions. In addition, the overall efficiency of the proposed renewable energy system is increased from 28% to 60% compared to standard hybrid power plants.

Download Full-text