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In this paper the results of ten months monitoring of the microgrid supplied by the photovoltaic generator and operating in the Mediterranean area have been presented. The microgrid architecture and control strategy have been described. Further, the analysis of the energy exchange between the microgrid and the main grid have been analyzed. A particular attention has been given to the optimization...
Microgrid systems provide benefits to strong, weak and remote power grids. Using multiple sources with differing characteristics and native constraints makes it a challenge to control the microgrid. Compared to the traditional central controller approach, a decentralized microgrid controller architecture has benefits including resiliency to asset and communication failures, which are experimentally...
The intermittent character of the photovoltaic generator, power electronic converters and load dynamic are the main factors leading operation instability in islanded microgrids. The necessity of the immediate control within the micro-source is very important since it impacts the interaction between micro-sources in the microgrid. This control level must be characterized by a fast and accurate response...
There is a growing trend within education establishments to teach electrical power system theory within lectures and back this up with software simulation laboratory sessions. This allows the courses to be taught at a lower cost than if real hardware was implemented. However, the students that are graduating from these programs are missing out on the opportunity to learn about real equipment and issues...
The paper examines application of wavelet transform for voltage dips detection in microgrids with distributed generation. IEEE13 test grid with added 1.6 MW distribution generators is used for evaluation. Distribution generators are two 0.8 MW doubly-fed induction generators. Matlab/Simulink environment is used for modelling and evaluation of proposed algorithm for voltage dips detection. Six types...
Introducing more Distributed Generation (DG) into power grid infrastructure drives more attention to understand how large scale DG affects grid operation. Islanding is an important concern in this area. Islanding refers to the condition that DGs within a microgrid continue energizing while the microgrid has been disconnected from the main grid. Considering the adverse effects of Islanding, it should...
At microgrids, classical grid-regulating generators are replaced by converter-interfaced distributed generation (DG) or energy storage systems (ESSs). This causes a reduction of the total inertia of the system and hence the microgrid voltage and frequency become more susceptible under power variations. DC microgrids are specially affected by this phenomena as systems with rotating inertia can not...
This paper presents a new approach for generation source management in a dc microgrid, which uses a hybrid isochronous-droop (HID) control strategy to overcome the inherent drawbacks of traditional droop control and achieve a performance more towards that which can be achieved by communication-based distributed or centralized control schemes. In particular, the approach allows the number of dc sources...
The transition from the traditional power grid to the smart grid improves reliability, performance, and management, while simultaneously increasing its susceptibility to cyberattacks. One of the biggest weaknesses in grid security is the human agent responsible for its maintenance and operations. As such, it is crucial to embed hands-on understanding of grid operations and security, especially for...
This paper describes a load management system for tactical microgrids that improves load balancing across three phases and provides load shedding capability. A single hardware design comprised of solid state relays enables switching of loads to specific phases during operation or, alternatively, shedding the loads to reduce demand. Load shedding can help alleviate overloading of generators and load...
Opportunities to develop commercial microgrids are emerging, but investors need analytical tools to assess the economics of microgrid business cases. A large part of the business case for microgrids in the real world is reliability based; yet in academic literature most tools analyze economics based on energy sales to customers or the macro grid. This work offers a new model, based on Monte Carlo...
The emerging potential of distributed generation (DG) is feasible to be conducted through microgrids implementation. A microgrid is a portion of the electrical system which views generation and associated loads as a subsystem, with the ability to operate both grid connected or islanded from grid, thus maintaining a high level of service and reliability. The existing grid infrastructure, the distributed...
A recent report from the German Energy Agency analyzes the possible introduction of the blockchain technology in energy transactions in power distribution. The issue deserves attention since the extensive digitalization of business models puts new challenges to utilities in the power sector. The German decision makers in the energy field claim that blockchain appears as a close perspective and, at...
The hospital's electric power system is typically complex, with a round the clock, 365 days per year required mission. Although normally the supply of electricity is taken for granted, natural disasters and terrorist attacks remind us how dependent we are on electricity and how fragile the system can be. In order to cover such a topic, resilience has been defined as the ability of a system to reduce...
In microgrid, the traditional centralized control strategy is a convenient way to realize system control and schedule, but it is completely dependent on communication which reduces the reliability of system, and plug and play is difficult to be realized for the distributed generator (DG). In order to overcome these challenges, this paper proposes a distributed control strategy based on multi-agent...
This paper presents a method to shed off the least important loads in a microgrid operated at constant frequency under the contingency of inadequate power generation. Different from conventional frequency deviation based load shedding, this paper discusses in detail how to shed off load based on the voltage deviation. The key issue is to differentiate whether the voltage deviation is due to sudden...
A microgrid is a clear energy system consisting of demand management, storage, generation system and loads which are capable of operating in parallel or independently with the main power grid. There are some issues in the inverter circuit design which are, high frequency switching loss and noise. In addition, an electrostatic generator generates high voltage DC and low current. Any types of wave distortion...
Since isolated microgrids, such as all-electric ships (AES), have limited generation and finite inertia, frequency and voltage violations are prone to happen in these microgrids. Therefore, it is necessary to have a power management framework for optimal scheduling of microgrids while achieving stable real-time operation. This paper introduces a novel multi-objective security constrained power management...
There is a lot of conversation about microgrids and how they are the future. This seems to be a truth based upon the ever-increasing deployment of DER worldwide. And when the microgrids are described they are typically shown as a self-healing network with a topography that creates a loop of some kind. This might be a great design for new feeder installations, but it would probably mean a lot of additional...
Microgrid systems is the advanced technology for the electric power system which improves the system reliability and stability with the support of RES (renewable energy system) in the power grid. The important aspect of microgrid are the battery, RES and connection with the main grid. In this paper photovoltaic (PV) with battery storage with two different loads for a small scale microgrid system are...
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