Frequency control in an isolated wind-diesel hybrid system with energy storage and an irrigation water supply system José Luis Monroy-Morales1 Rafael Peña-Alzola2 Rafael Sebastián-Fernández3 David Campos-Gaona2 Jerónimo Quesada Castellano4 José L. Guardado 1Electrical Engineering, TecNM/Instituto Tecnológico de Morelia, Morelia, Mexico 2Electronic and Electrical Engineering, University of Strathclyde, Glasgow, UK 3Department of Electrical, Electronic and Control Engineering, UNED, Madrid, Spain 4Electronic Technology, University of the Basque Country, Vitoria, Spain
sexta-feira, 12 de abril de 2024
IET Renewable Power Generation Research - Optimal sizing of a wind/solar/battery hybrid grid-connected microgrid system-José Luis Monroy-Morales, Rafael Peña-Alzola2,Rafael Sebastián-Fernández, David Campos-Gaona,Jerónimo Quesada Castellano, José L. Guardado
Frequency control in an isolated wind-diesel hybrid system with energy storage and an irrigation water supply system José Luis Monroy-Morales1 Rafael Peña-Alzola2 Rafael Sebastián-Fernández3 David Campos-Gaona2 Jerónimo Quesada Castellano4 José L. Guardado 1Electrical Engineering, TecNM/Instituto Tecnológico de Morelia, Morelia, Mexico 2Electronic and Electrical Engineering, University of Strathclyde, Glasgow, UK 3Department of Electrical, Electronic and Control Engineering, UNED, Madrid, Spain 4Electronic Technology, University of the Basque Country, Vitoria, Spain
Abstract
Wind-Diesel Hybrid Systems (WDHSs) integrate wind turbines into diesel power systems,
reducing costs and emissions in isolated grids. Due to the no-load consumption of the
Diesel Generators (DGs), fuel savings are only possible when the DGs are shut down.
This requires a proper implementation of the frequency control to avoid perturbations
because of the wind speed variations. During wind-only (WO) operation, the Synchronous
Machine (SM) generates the isolated grid voltage and the frequency controller varies the
energy stored/supplied by an Energy Storage System and consumed by the controllable
loads to balance the power. In this paper, a Battery-based Energy Storage System (BESS)
uses Li-Ion batteries with a Dual Active Bridge (DAB) and a grid-tie inverter connected to
the isolated network. The controllable load is an Irrigation Water Supply System (IWSS),
consisting of a pump supplying water to a reservoir tank. The pump is driven by a variable
speed drive that uses a Permanent Magnet Synchronous Motor (PMSM). The coordinated
control of BESS and IWSS gives full priority to the BESS for harnessing the wind potential whereas the IWSS consumes the excess of wind power. The full Wind Diesel Power
System (WDPS) is modelled and simulated to validate the proposed system for different
case scenarios.
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Optimal sizing of a wind/solar/battery hybridgrid-connected microgrid system-BY-Umer Akram, Muhammad Khalid, Saifullah Shafiq, Department of Electrical Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
IET Renewable Power GenerationResearch ArticleOptimal sizing of a wind/solar/battery hybridgrid-connected microgrid system Umer Akram1 , Muhammad Khalid1, Saifullah Shafiq1 1Department of Electrical Engineering, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia E-mail: g201512930@kfupm.edu.sa
Abstract: Higher cost and stochastic nature of intermittent renewable energy (RE) resources complicate their planning,integration and operation of electric power system. Therefore, it is critical to determine the appropriate sizes of RE sources andassociated energy storage for efficient, economic and reliable operation of electric power system. In this study, two constraint-based iterative search algorithms are proposed for optimal sizing of the wind turbine (WT), solar photovoltaic (PV) and thebattery energy storage system (BESS) in the grid-connected configuration of a microgrid. The first algorithm, named as sourcessizing algorithm, determines the optimal sizes of RE sources while the second algorithm, called as battery sizing algorithm,determines the optimal capacity of BESS. These algorithms are mainly based upon two key essentials, i.e. maximum reliabilityand minimum cost. The proposed methodology aims to avoid over- and under-sizing by searching every possible solution in thegiven search space. Moreover, it considers the forced outage rates of PV, WT and utilisation factor of BESS which makes itmore realistic. Simulation results depict the effectiveness of the proposed approach.
quinta-feira, 11 de abril de 2024
A Unified Control and Power Management Scheme for PV-Battery-Based Hybrid Microgrids for Both Grid-Connected and Islanded Modes Zhehan Yi, Student Member, IEEE, Wanxin Dong, and Amir H. Etemadi, Member, IEEE
A Unified Control and Power Management Scheme for PV-Battery-Based Hybrid Microgrids for Both Grid-Connected and Islanded Modes
Zhehan Yi, Student Member, IEEE, Wanxin Dong, and Amir H. Etemadi, Member, IEEE
Abstract
Battery storage is usually employed in Photovoltaic (PV) system to mitigate the power fluctuations due to the characteristics of PV panels and solar irradiance. Control schemes for PV-battery systems must be able to stabilize the bus voltages as well as to control the power flows flexibly. This paper proposes a comprehensive control and power management system (CAPMS) for PV-battery-based hybrid microgrids with both AC and DC buses, for both grid-connected and islanded modes. The proposed CAPMS is successful in regulating the DC and AC bus voltages and frequency stably, controlling the voltage and power of each unit flexibly, and balancing the power flows in the systems automatically under different operating circumstances, regardless of disturbances from switching operating modes, fluctuations of irradiance and temperature, and change of loads. Both simulation and experimental case studies are carried out to verify the performance of the proposed method.
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quarta-feira, 10 de abril de 2024
Smart inverters for seamless voltage and frequency dynamics in microgrids by Mohsen Shid Pilehvar-DISSERTATION submitted in partial fulfillment of the requirements for the degree DOCTOR OF PHILOSOPHY Mike Wiegers Department of Electrical & Computer Engineering --KANSAS STATE UNIVERSITY Manhattan, Kansas 2021-
Smart inverters for seamless voltage and frequency dynamics in microgrids by Mohsen Shid Pilehvar
AN ABSTRACT OF A DISSERTATION
submitted in partial fulfillment of the
requirements for the degree
DOCTOR OF PHILOSOPHY
Mike Wiegers
Department of Electrical & Computer Engineering
Carl R. Ice College of Engineering
KANSAS STATE UNIVERSITY
Manhattan, Kansas
2021
Abstract
This dissertation focuses on improving the dynamic behavior of microgrids during the abnormal
conditions. For this purpose, novel approaches are presented to turn the conventional
inverters implemented in distributed generation (DG) units into smart inverters capable of
dealing with disturbances. In the context of microgrids, the smartness of an inverter is tied
to its ability to cope with abnormalities such as sudden load changes, loss of generation, and
transitions between different modes of operation. Founded on these principles, this dissertation
advances the state-of-the-art in enhancing the dynamic response of microgrids. To
this end, firstly, a new approach of forming smart loads in a fleet of nanogrids, which is
also referred as a grid of nanogrids (GNG), is presented in this dissertation. The proposed
smart load configuration is obtained via series connection of electric dampers (EDs) with
critical loads to cope with disturbances at the point of critical loads. A systematic approach
is presented for modeling of the proposed smart loads considering the switching states of
EDs. The stability of the smart loads is then studied using the developed state-space model.
Secondly, the conventional controllers of battery energy storage system (BESS) and photovoltaic
(PV) units are modified in this dissertation in order to enable them to participate
in dynamic-response enhancement of islanded mixed-inertia microgrids. For this purpose,
two piecewise linear-elliptic (PLE) droops are proposed and employed in BESS to improve
the voltage and frequency profiles during abnormalities. Besides, the controllers of PV units
are equipped with an adaptive piecewise droop (APD) to cope with disturbances. Lastly,
an approach is presented in this dissertation for seamless interconnection of three singlephase
feeders at distribution level for residential communities that are suffering from power
imbalance within the phases during islanded mode. To attain this, a seamless transition
algorithm is presented which monitors the system condition in real time and sends appropriate
commands to the static transfer switches (STSs) and modified controllers of single-phase
inverters. Using the proposed method for interconnecting the isolated single-phase feeders
results in forming a unified single-phase residential microgrid and maintaining the power
balance and voltage level within all three phases. Moreover, the proposed approach enables
the residential community to seamlessly reconnect to the main grid after resolving the abnormal
condition on the grid side. In this dissertation, numerous case studies are carried
out in PSCAD/EMTDC environment to validate the viability of proposed approaches in
improving the dynamic behavior of microgrids.
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segunda-feira, 8 de abril de 2024
Comparison Between Different Droop Based Control Techniques and a Virtual Control Oscillator Carlos G. C. Branco1,*, Jordi El Mariachet Carreno1, Mingshen Li1, Francisco Kleber de A. Lima2, José Matas1, Josep M. Guerrero3
Comparison Between Different Droop Based Control Techniques and a Virtual Control Oscillator Carlos G. C. Branco1,*, Jordi El Mariachet Carreno1, Mingshen Li1, Francisco Kleber de A. Lima2, José Matas1, Josep M. Guerrero Abstract: This work presents a literature review about control techniques for parallel connected power inverters under microgrid applications. Some control strategies, based on droop control for parallel inverters of distributed generation units in an ac distribution system will be presented in this work. Finally, an important method called Virtual Oscillating Control (VOC) is suggested for connecting voltage source inverters. Inverters are able to work in parallel with a constant-voltage constant frequency system, as well as with other inverters and also in standalone operation. The different power sources can share the load also under unbalanced conditions. Throughout this work several simulation results are presented in order to demonstrate the behaviour.
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