scholarly journals An Original Control Strategy of Storage Systems for the Frequency Stability of Autonomous Grids with Renewable Power Generation

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4391
Author(s):  
Mariano G. Ippolito ◽  
Fabio Massaro ◽  
Rossano Musca ◽  
Gaetano Zizzo
Keyword(s):  
Power Generation ◽  
Control Strategy ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Frequency Stability ◽  
Operating Conditions ◽  
Storage Unit ◽  
Renewable Power ◽  
Renewable Power Generation ◽  
Storage Units

This work examines the operation of the autonomous power system of a geographical island assuming the integration of significant generation shares from renewable energy sources and the installation of the required storage systems. The frequency stability of the system is investigated considering different operating conditions, in terms of load demand and renewable power generation. The main focus of the work is an original control strategy specifically designed for power converters interfacing storage units to the grid. The proposed strategy is based on an extended frequency droop control, which selects specific droop settings depending on the operating mode—charge or discharge—of the storage unit. A simulation model of the whole electrical system is developed for dynamic analysis. The model also implements the possibility of including specific auxiliary frequency controls for synthetic inertia and primary reserve. The results of the simulation and analysis indicate that the proposed control strategy has a significant positive effect, making the storage units able to provide a fundamental and more effective support to the frequency stability of the system. The application of the proposed control strategy to storage units also reduces the need for a contribution to the frequency control from intermittent and variable sources, making the whole system more robust, stable and reliable.

scholarly journals Flexible Power System Defense Strategies in an Isolated Microgrid System with High Renewable Power Generation

2020 ◽  
Vol 10 (9) ◽  
pp. 3184
Author(s):  
Yuan-Kang Wu ◽  
Kuo-Ting Tang ◽  
Zheng Kuan Lin ◽  
Wen-Shan Tan
Keyword(s):  
Power Generation ◽  
Power System ◽  
Control Strategy ◽  
Frequency Stability ◽  
Operating Costs ◽  
Diesel Generator ◽  
Preventive Control ◽  
Defense Strategies ◽  
Renewable Power ◽  
Renewable Power Generation

This work develops an underfrequency preventive control strategy for an islanded power system with a high penetration of wind power generation. First, the preventive control strategy uses the frequency nadir forecasting module to analyze the frequency stability under largest diesel generator tripping (N-1) contingency events. If predicted frequency nadir is too low, four frequency support methods are then analyzed and used for preventing potential frequency stability problem. They include generator rescheduling (GR), the use of battery energy storage system (BESS), direct load control (DLC) and emergency demand response program (EDRP). In terms of the GR method, the optimal diesel generator dispatch is obtained, with sufficient frequency stability and minimal fuel cost and start-up cost. In the BESS method, the optimal instantaneous power output from BESS is obtained based on its frequency support capability. With the DLC or EDRP method, the optimal contract-based load-shedding or the load-reduction to provide frequency support is obtained, respectively. Then, the operating costs of each method to support frequency are analyzed. The research methods and simulation results are very useful to the low-frequency protection of actual power systems with high renewable power generation. This work proposed a complete defense strategy in a microgrid system. It combines GR, BESS, DLC and EDRP. Therefore, the system operators have many options to implement their defense strategies, based on the operating costs of various methods. In other words, the proposed defense strategy provides a more flexible solution for the protection of micro grids with a high renewable power penetration. Therefore, the solution considers the system safety and economical aspects.

scholarly journals Decentralized Autonomous Hybrid Renewable Power Generation

2015 ◽  
Vol 2015 ◽  
pp. 1-18 ◽  
Author(s):  
Prakash Kumar ◽  
Dheeraj Kumar Palwalia
Keyword(s):  
Power Generation ◽  
Renewable Energy Sources ◽  
Optimization Techniques ◽  
Storage Unit ◽  
Thermal Generation ◽  
Energy Storage Unit ◽  
Progressive Development ◽  
Renewable Power ◽  
Renewable Power Generation ◽  
Pv Generation

Power extension of grid to isolated regions is associated with technical and economical issues. It has encouraged exploration and exploitation of decentralized power generation using renewable energy sources (RES). RES based power generation involves uncertain availability of power source round the clock. This problem has been overcome to certain extent by installing appropriate integrated energy storage unit (ESU). This paper presents technical review of hybrid wind and photovoltaic (PV) generation in standalone mode. Associated components like converters, storage unit, controllers, and optimization techniques affect overall generation. Wind and PV energy are readily available, omnipresent, and expected to contribute major future energy market. It can serve to overcome global warming problem arising due to emissions in fossil fuel based thermal generation units. This paper includes the study of progressive development of standalone renewable generation units based on wind and PV microgrids.

scholarly journals Residential Air Conditioning System Integrated with Packed Bed Cool Storage Unit for Promoting Rooftop Solar PV Power Generation

2020 ◽  
Vol 10 (2) ◽  
pp. 239-247
Author(s):  
Kesavan Muthaiyan ◽  
Rajamani Narayanasamy ◽  
Chidambaram Lakshmanan ◽  
Pandiyarajan Vellaichamy ◽  
Velraj Ramalingam
Keyword(s):  
Power Generation ◽  
Air Conditioning ◽  
Packed Bed ◽  
Storage Unit ◽  
Cool Storage ◽  
Renewable Power ◽  
Residential Air Conditioning ◽  
Cooling Coil ◽  
Change Material ◽  
Storage Units

The increase in the share of renewable-based power in the gross power generation in most countries causes significant concerns over the addition of renewable power with the grid, results in stability issues in most developed nations. Energy storage is an emerging technology that is considered the ultimate solution in developing microgrids with distributed renewable power generation. The cool thermal storage plays a vital role in economically promoting renewable power among different storage units. The major objective of the research work is to demonstrate the integration of residential air-conditioning systems with packed bed cool storage units to promote rooftop solar power generation for residential space cooling applications. In order to achieve the said objective, an experimental investigation was made to study the charging/discharging characteristics of a packed bed cool-storage unit combined with a chiller and a cooling coil unit suitable for small capacity air-conditioning applications. The system consists of encapsulated spherical capsules filled with a phase change material blended with distilled water and pseudomonas (nucleating agent) and the heat transfer fluid as a combination of distilled water and Mono-ethylene glycol. A cooling coil unit was connected to the cool-storage tank to transfer cool energy from the storage tank to the space to be cooled when there is a demand. The important parameters, such as instantaneous and cumulative heat transfer during the charging/discharging processes, are presented. The average COP values of the chiller during the charging operation were estimated as 1, 0.93, and 0.89 when the HTF setpoint temperatures were -6°C, -9°C, and -12°C, which shows a decrease in performance as the setpoint temperature decreases. During the discharging process, a cooling load of 2.25 kW is obtained during the first cycle of operation and gradually reduces to 0.3 kW during the sixth cycle of operation. The increase in the HTF temperature during each cycle of operation indicates that the Phase Change Material (PCM) in the balls cannot release the heat as per the demand after a certain period of discharging. Hence, decreasing the internal thermal resistance by suitable measures is essential to achieve uniform heat flux and to operate the system successfully

Analysis of the influence of renewable energy sources on thermal energy generation for isolated power systems

2019 ◽  
pp. 0309524X1987403 ◽  
Author(s):  
Aleksey A Zhidkov ◽  
Andrey A Achitaev ◽  
Mikhail V Kashurnikov
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Power Systems ◽  
Power Supply ◽  
Power Plants ◽  
Renewable Energy Sources ◽  
Energy Sources ◽  
Renewable Power ◽  
Renewable Power Generation ◽  
Autonomous Power Systems

The urgency of developing renewable power generation in Russia is associated with the presence of a large number of regions with a low degree of electrification. More than two-thirds of the territory of Russia is located in the area of decentralized power supply, where the main source of energy is imported diesel fuel or associated gas from local fields. At present, one of the directions for the development of renewable power generation in Russia is the implementation of a hybrid power supply system for autonomous power systems of remote regions. However, along with the possibility of using renewable energy sources, it is important for such regions to generate heat from co-generation of diesel power plants, since there is an urgent problem of heat supply for remote regions, especially located in the Far North of Russia. This article presents an analysis of the influence of using renewable energy sources in autonomous power systems on co-generation of diesel power plants.

scholarly journals Smart Grid in China, EU, and the US: State of Implementation

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5637
Author(s):  
Paolo Sospiro ◽  
Lohith Amarnath ◽  
Vincenzo Di Nardo ◽  
Giacomo Talluri ◽  
Foad H. Gandoman
Keyword(s):  
Power Generation ◽  
Smart Grid ◽  
Renewable Energy Sources ◽  
Electric Power System ◽  
Renewable Power ◽  
The Us ◽  
Renewable Power Generation ◽  
End Use ◽  
Smart Grid Technology ◽  
The Eu

Depletion of fossil fuel deposits is the main current issue related to the world’s power generation. Renewable energy sources integrated with energy efficiency represent an effective solution. The electrification of end-use coupled with renewable power generation integration is considered as an important tool to achieve these tasks. However, the current electric power system does not currently have the suitable features to allow this change. Therefore, in the future, it has to allow two-way direction power flows, communication, and automated controls to fully manage the system and customers. The resulting system is defined as the smart grid. This article analyses the smart grid state of play within China, the US, and the EU, assessing the completion state of each smart grid technology and integrated asset. The analysis related to these countries presented here shows that the smart grid overall state of play in China, the US, and the EU are equal to 18%, 15%, and 13%, respectively, unveiling the need related to further efforts and investments in these countries for the full smart grid development.

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