scholarly journals A Distributed Control Strategy for Islanded Single-Phase Microgrids with Hybrid Energy Storage Systems Based on Power Line Signaling

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 85 ◽  
Author(s):  
Pablo Quintana-Barcia ◽  
Tomislav Dragicevic ◽  
Jorge Garcia ◽  
Javier Ribas ◽  
Josep Guerrero
Keyword(s):  
Energy Storage ◽  
Distributed Control ◽  
Control Strategy ◽  
Single Phase ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Power Line ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Hybrid Energy Storage

Energy management control is essential to microgrids (MGs), especially to single-phase ones. To handle the variety of distributed generators (DGs) that can be found in a MG, e.g., renewable energy sources (RESs) and energy storage systems (ESSs), a coordinated power regulation is required. The latter are generally battery-based systems whose lifetime is directly related to charge/discharge processes, whereas the most common RESs in a MG are photovoltaic (PV) units. Hybrid energy storage systems (HESS) extend batteries life expectancy, thanks to the effect of supercapacitors, but they also require more complex control strategies. Conventional droop methodologies are usually applied to provide autonomous and coordinated power control. This paper proposes a method for coordination of a single-phase MG composed by a number of sources (HESS, RES, etc.) using power line signaling (PLS). In this distributed control strategy, a signal whose frequency is higher than the grid is broadcasted to communicate with all DGs when the state of charge (SoC) of the batteries reaches a maximum value. This technique prevents batteries from overcharging and maximizes the power contribution of the RESs to the MG. Moreover, different commands apart from the SoC can be broadcasted, just by changing to other frequency bands. The HESS master unit operates as a grid-forming unit, whereas RESs act as grid followers. Supercapacitors in the HESS compensate for energy peaks, while batteries respond smoothly to changes in the load, also expanding its lifetime due to less aggressive power references. In this paper, a control structure that allows the implementation of this strategy in single-phase MGs is presented, with the analysis of the optimal range of PLS frequencies and the required self-adaptive proportional-resonant controllers.

scholarly journals Microgrid system including PV generation and hybrid backup system

2021 ◽  
Author(s):  
Hooman Samani
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Energy Flow ◽  
Storage Systems ◽  
Photovoltaic Module ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Backup System ◽  
Micro Grid

This Master’s thesis project introduces a micro-grid system that includes a hybrid power storage backup system and photovoltaic module power generation system, which is connected to the grid and supports the hybrid backup system. The first section presents a solution or algorithm to an existing problem in an energy flow management strategy for the hybrid energy storage system. In the second section, power is provided from the photovoltaic arrays by the convenience of the Maximum Power Point Tracking (MPPT) for each photovoltaic module. The generated power will charge the storage backup system. The micro-grid is capable of selling the surplus power to the utility grid. A master controller optimizes integration, dispatching and control over the whole micro-grid operation. There have been many different control strategies and topologies presented over the years to manage the energy flow for hybrid energy storage systems; however, there are some aspects that differentiate some from others, such as real-time prediction, cumbersome architecture, full spectrum control over recourses, and cost-effectiveness. The first section of this thesis proposes a control strategy on hybrid energy storage systems based on fundamental electrical principles. The low volume and simple algorithm make the controller easy to perform on the embedded systems and quickly responds within a tiny space. The control strategy is equipped with a load prediction method, which provides a fast response at the time of load current surge. The controller architect provides the full control over all the resources. The presented controller is cost-effective by increasing the battery life and by minimizing the power loss in the hybrid storage backup system. The simulation results in two different experiments validate the efficiency and performance of the offered control strategy for hybrid backup system.

scholarly journals A Review on the Selected Applications of Battery-Supercapacitor Hybrid Energy Storage Systems for Microgrids

Energies ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 4559 ◽  
Author(s):  
Muhammad Khalid
Keyword(s):  
Energy Storage ◽  
Alternative Energy ◽  
Storage Systems ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Past Research ◽  
Main Concern ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Hybrid Energy Storage

This paper presents a comprehensive categorical review of the recent advances and past research development of the hybrid storage paradigm over the last two decades. The main intent of the study is to provide an application-focused survey where every category and sub-category herein is thoroughly and independently investigated. Implementation of energy storage systems is one of the most interestingly effective options for further progression in the field of alternative energy technology. Apart from a meticulous garnering of the energy resources regulated by the energy storage, the main concern is to optimize the characteristic integrity of the storage devices to achieve a practically techno-economic size and operation. In this paper, hybrid energy storage consisting of batteries and supercapacitors is studied. The fact that the characteristic of batteries is mostly complementary to that of supercapacitors, hybridizing these storage systems enhances their scope of application in various fields. Therefore, the objective of this paper is to present an inclusive review of these applications. Specifically, the application domain includes: (1) regulation of renewable energy sources, (2) contributions to grid regulation (voltage and frequency compensation, contribution to power system inertia), (3) energy storage enhancements (life cycle improvement, and size reduction), (4) regenerative braking in electric vehicles, (5) improvement in wireless power transfer technology. Further, this review also descriptively highlights the control strategies implemented in these domains of applications. The application-oriented review explicates the principle advantages with the hybridization of battery and supercapacitor energy storage systems that can be used as an insight for further development in the field of energy storage technology and its applications.

scholarly journals Microgrid system including PV generation and hybrid backup system

2021 ◽  
Author(s):  
Hooman Samani
Keyword(s):  
Energy Storage ◽  
Control Strategy ◽  
Energy Flow ◽  
Storage Systems ◽  
Photovoltaic Module ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Backup System ◽  
Micro Grid

This Master’s thesis project introduces a micro-grid system that includes a hybrid power storage backup system and photovoltaic module power generation system, which is connected to the grid and supports the hybrid backup system. The first section presents a solution or algorithm to an existing problem in an energy flow management strategy for the hybrid energy storage system. In the second section, power is provided from the photovoltaic arrays by the convenience of the Maximum Power Point Tracking (MPPT) for each photovoltaic module. The generated power will charge the storage backup system. The micro-grid is capable of selling the surplus power to the utility grid. A master controller optimizes integration, dispatching and control over the whole micro-grid operation. There have been many different control strategies and topologies presented over the years to manage the energy flow for hybrid energy storage systems; however, there are some aspects that differentiate some from others, such as real-time prediction, cumbersome architecture, full spectrum control over recourses, and cost-effectiveness. The first section of this thesis proposes a control strategy on hybrid energy storage systems based on fundamental electrical principles. The low volume and simple algorithm make the controller easy to perform on the embedded systems and quickly responds within a tiny space. The control strategy is equipped with a load prediction method, which provides a fast response at the time of load current surge. The controller architect provides the full control over all the resources. The presented controller is cost-effective by increasing the battery life and by minimizing the power loss in the hybrid storage backup system. The simulation results in two different experiments validate the efficiency and performance of the offered control strategy for hybrid backup system.

scholarly journals Rooftop Solar and Wind Power Based Hybrid Energy Storage System for AC Railway Traction

2020 ◽  
Vol 9 (5) ◽  
pp. 899-903
Keyword(s):  
Renewable Energy ◽  
Energy Storage ◽  
Wind Power ◽  
Storage Systems ◽  
Renewable Energy Sources ◽  
Energy Storage Systems ◽  
Alternative Source ◽  
Hybrid Energy ◽  
Hybrid Energy Storage ◽  
Railway Traction

The conventional AC/DC Railway Traction Systems are undergoing number of improvements. Thanks to modern technologies such as Renewable Energy Systems (RES), Energy Storage Systems (ESS) and Hybrid Energy Storage Systems (HESS). At present the traction transformers cater electric supply to traction motors and auxiliary loads which may not be adequate enough to meet demands. Furthermore in the event of failure of traction supply, the alternative source of supply is required. This papers suggests a noval method of feeding auxiliary loads through the integration of RES and ESS. Solar and Wind power are vital renewable energy sources. The pros and cons of proposed method are also discussed in this paper.

scholarly journals Sizing of Hybrid Energy Storage Systems for Inertial and Primary Frequency Control

2021 ◽  
Vol 9 ◽  
Author(s):  
Erick Fernando Alves ◽  
Daniel dos Santos Mota ◽  
Elisabetta Tedeschi
Keyword(s):  
Energy Storage ◽  
Storage Systems ◽  
Frequency Control ◽  
Renewable Energy Sources ◽  
Storage System ◽  
Energy Storage System ◽  
Storage Device ◽  
Energy Storage Systems ◽  
Hybrid Energy ◽  
Hybrid Energy Storage

The exponential rise of renewable energy sources and microgrids brings about the challenge of guaranteeing frequency stability in low-inertia grids through the use of energy storage systems. This paper reviews the frequency response of an ac power system, highlighting its different time scales and control actions. Moreover, it pinpoints main distinctions among high-inertia interconnected systems relying on synchronous machines and low-inertia systems with high penetration of converter-interfaced generation. Grounded on these concepts and with a set of assumptions, it derives algebraic equations to rate an energy storage system providing inertial and primary control. The equations are independent of the energy storage technology, robust to system nonlinearities, and rely on parameters that are typically defined by system operators, industry standards, or network codes. Using these results, the authors provide a step-by-step procedure to size the main components of a converter-interfaced hybrid energy storage system. Finally, a case study of a wind-powered oil and gas platform in the North Sea demonstrates with numerical examples how the proposed methodology 1) can be applied in a practical problem and 2) allows the system designer to take advantage of different technologies and set specific requirements for each storage device and converter according to the type of frequency control provided.

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