The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents a novel hybrid adaptive droop controller to simultaneously regulate both the AC-side and DC-side parameters for power electronic converters in single-phase Microgrids. The main contribution of this paper is to integrate the AC-side and DC-side controllers. Unlike previously presented control schemes, where the DC-bus is considered as an infinite bus or constant voltage bus, the...
This paper proposes an adaptive power management strategy with reduced sensor requirement for grid connected hybrid microgrid system under faulty conditions which occur in grid tied converters. Generally parallel combination of grid tied converters (GTCs) are used as an interface between microgrid and grid, which are responsible for power transfer among renewable energy sources (RES), hybrid energy...
Microgrids are characterized as weak systems with poor power quality due to significant variations in frequency and/or voltage that can occur during sudden changes in load demand. This problem is exacerbated in cases where one of the power sources is tied to the microgrid through a grid-interactive inverter which is designed to trip when deviations in frequency and voltage exceed well-defined thresholds...
In microgrids, photovoltaic (PV) and storage are integrated as a droop-controlled ideal source, which is not practical and challenges the system efficiency. Instead, PV-storage can be allocated separately. This PV-storage independent system is more flexible and easier to optimize. But, the conventional PQ-controlled PVs rely on master voltage-controlled storage sources. In this paper, a novel operation...
In this paper, an autonomous communication-based centralized control for DC microgrids (MG) has been developed and implemented. The proposed controller enables smooth transition between various operating modes. Finite state machine (FSM) has been used to mathematically describe the various operating modes (states), and events that may lead to mode changes (transitions). Therefore, the developed centralized...
Energy efficiency and cost are the two key driving factors for increased usage of hybrid- and DC-microgrids in both urban and rural settings. In order to accomplish this critical objective, number of energy conversion stages from source to load need to be reduced and efficiency of every power conversion electronic block needs to be increased by carefully taking into account system-level interactions...
Microgrid(μG) is a concept of feeding local loads incorporating Renewable Energy Source and energy storage systems through inverters to maintain a local power system near to the load center. Microgrid should work both in presence and absence of grid to increase the quality, reliability and efficiency of power delivery. Inverters used in Microgrid have to work in both grid tied and standalone mode...
For photovoltaic inverters in islanded microgrids, droop control is a preferable strategy due to its attractive ability in bus voltage regulation and load sharing without additional communication system. However, in islanded microgrids without redundant storages, further realization of power balance between droop controlled PV sources and dynamic loads, which is beneficial to enhance PV sources penetration...
This paper reports on the work of the CIGRÉ C6.22 Working Group, Microgrid Evolution Roadmap, which has recently finalized its first Technical Brochure. The Working Group was asked to identify the main elements required to justify, develop, and implement viable microgrids, which the Group defined as follows: Microgrids are electricity distribution systems containing loads and distributed energy resources,...
A coordinated secondary control based on a novel autonomous currents sharing control strategy for balanced discharge rate of energy storage systems in islanded microgrid (MG) is proposed in this paper. The coordinated secondary controller is able to regulate the output power of distributed generating (DG) systems according to their state-of-charge by adjusting the virtual resistances of their voltage...
This paper presents a power management concept for DC microgrids where the DC bus voltage is used as the mean of communications between the microgrid components. It is proposed that the energy storage system always controls the DC bus voltage independently of the microgrid mode of operation and sets its value based on power and energy management rules to activate responses from the other components...
Important criteria for the widespread usage of DC electricity are the overall energy efficiency and cost of delivering electricity from the point of generation to the point of usage. Wide bandgap (WBG) semiconductor power switching devices, including those made from Silicon Carbide (SiC) and Gallium Nitride (GaN) semiconductors, offer unprecedented advantages over conventional silicon devices in terms...
Distribution Generation Networks connected to low voltage distribution networks are nowadays becoming popular due to advantages over the other resources and environmental benefits. In spite of these benefits DG also impacts on the power system. Problems arising due to connection of Distribution Generation (DG) to the Distribution Network (DN) are such as power system stability issues, voltage regulation...
In many low-income settings and geographies it's not immediately feasible to deploy central power generation with electric grids. In this context, off-grid approaches like solar home systems (SHS) are gaining wide acceptance. Since battery storage costs are the dominant costs, the value proposition of using a novel mini-grid with shared generation/ storage as opposed to SHS is examined. The relative...
Energy resource scheduling and Intelligent load controlling through smart grid is a fashion in modern power systems to enhance reliability and efficiency. Microgrid also use smart controlling technologies to sustain grid stability when it is in islanding conditions. The aim of this research is to present a new control strategy that is based on distributed autonomous control strategies and Multi Agent...
The purpose of this paper is to relate the issues which have an impact on the interconnection of distributed resources to the utility grid. Impact that can be clearly seen is with respect to the types of distributed resources and the power electronic (PE) devices used to interface them. A balance has to be maintained between the type of DER's and the interfaces in order to get the maximum benefit...
One of the most challenging topic related to practical implementation of innovative distribution network paradigms, such as microgrids, is fault protection. General solutions, guidelines and standards, somehow defined worldwide for traditional distribution systems, have not been found yet and perhaps even not possible for microgrids protection. It is still necessary to investigate different potential...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.