An Overview on Microgrid Concept with Special Focus on Islanding Protection Issues (original) (raw)

Importance of microgrid in the current scenario and its Islanding

2016

around the world with great pace due to which demand for electricity has increased enormously and it will continue to increase more and more in the time to come. As a matter of fact in the time to come the importance of microgrid either connected with non conventional or conventional sources is going to increase. Microgrid can play a vital role in future electricity transmission. Microgrid alone cannot fulfil the requirement its proper functioning is also required, which means that we would be able to connect or disconnect it to the main grid whenever required. Proper islanding in proper time is required to increase the reliability of the system as a whole. In this paper, the importance of microgrid connected to the main grid and the importance of islanding in proper time is analyzed during the fault in the main grid in the ETAP environment.

Awareness On Microgrids And Various Protection Issues To Overcome In It

International Journal of Scientific & Technology Research, 2015

As we know India faces problem of Power blackout every year due to the overloading on the main electrical grid. To avoid the above problem, Microgrids are the best solution. Basically, Microgrids are the small version of electrical grid. They are independent power system. Microgrids can be connected with renewable energy sources such as solar and wind. The use of renewable energy introduces the need of various storing devices and supplies it whenever required. Microgrids can provide wide range of applications in buildings, military camps and corporate/academic campuses, etc. They can have efficient and effective provision of electricity to "off-grid" areas as well as "keep the lights on" in times of crisis for critical applications like hospital. Though, Microgrids being so advantageous it has several technical challenging issues to overcome i.e. voltage and frequency control, islanding and its protection in Microgrids. This paper discusses the overview of Microg...

IRJET- Importance of microgrid in the current scenario and its Islanding

As we know that development is taking place all around the world with great pace due to which demand for electricity has increased enormously and it will continue to increase more and more in the time to come. As a matter of fact in the time to come the importance of microgrid either connected with non conventional or conventional sources is going to increase. Microgrid can play a vital role in future electricity transmission. Microgrid alone cannot fulfil the requirement its proper functioning is also required, which means that we would be able to connect or disconnect it to the main grid whenever required. Proper islanding in proper time is required to increase the reliability of the system as a whole. In this paper, the importance of microgrid connected to the main grid and the importance of islanding in proper time is analyzed during the fault in the main grid in the ETAP environment.

Microgrids Operation in Islanded Mode

Sustainable Development in Energy Systems, 2017

The smart grid concept is intended to improve power system operation and control. A feasible path to make the system smarter is through microgrids deployment. A microgrid is a small scale-power system with its own power generation units and deferrable loads, and it may work islanded or connected to the main power grid. The main objective of microgrids in islanded mode is to allow the system to operate even in adverse scenarios, such as faults in main grid, high prices of main grid's power, and supplying remote areas. In the case of an islanding, high priority loads, such as hospitals, transportation and telecommunication facilities must have their supply assured. This is possible due to the penetration of Distributed Energy Resources (DERs), including renewable, fossil, combined heat and power, and energy storage units. However, the operation of microgrids in islanded mode requires more attention due to the higher outage risk since the power generation capacity is limited. Consequently, microgrids may be provided by an Energy Management System (EMS) responsible for managing the scarce power resources to maintain the supply for the highest priority customers connected to the

A Survey of Techniques Used to Control Microgrid Generation and Storage during Island Operation

A microgrid is a cluster of interconnected distributed generators, loads and intermediate storage units that cooperate with each other to be collectively treated by the grid as a controllable load or generator. Power quality events and pre-set conditions will make the microgrid disconnect from the main grid and operate as a separate island. This paper enumerates and discusses the issues concerning the island operation of microgrids. The microsources and storage device should cooperate with each other to maintain the integrity of the islanded microgrid. Six cooperation approaches proposed by various authors are presented. The strategies are then compared based on their applicability to different control requirements.

An Islanded Microgrid Design: A Case Study

2022

Mafate is a natural protected cirque in Reunion Island, where about 300 dwellings are settled. The locals suffer from a massive energy insecurity because Mafate is not connected to the main grid. Although stand-alone solar microgrid installations are the preferred solution, they cause significant costs. "Micro Réseau Mafate" is a research project funded mainly by the European Regional Development Fund aiming at proposing strategies for microgrid development. In this paper, an actual islanded microgrid in Mafate is under scrutiny. The objective of the study is to rightsize the actual microgrid design considering the actual energy demand and solar resource measured in-situ. A Levelized Cost of Energy analysis is carried out and energy demand increasing scenarios are considered.

Planning, Operation, and Protection of Microgrids: An Overview

Energy Procedia, 2017

The significance of microgrids is growing rapidly. Microgrids have a huge potential in boosting the sustainable growth. A microgrid can operate in grid-connected or islanded mode. In islanded mode, microgrids can provide electricity to the rural areas with lower cost and minimum power losses. In grid-connected mode, microgrids can help in supporting the main grid in many ways with voltage control, frequency control, and can provide more flexibility, control, and reliability. However, successful operation of a microgrid requires proper planning and there are major challenges regarding the operation, control, and protection of microgrids that need to be tackled for successful deployment of microgrids. Depending on the mode of operation (grid connected mode or islanded mode), necessary control strategies and protection schemes are required. Several methods have been proposed in the literature for the successful operation of a microgrid. This paper presents an overview of the major challenges and their possible solutions for planning, operation, and control of islanded operation of a microgrid.

Operation and control of micro sources in Island mode of a Microgrid

2014

In the country like India where population is increasing at a rapid rate the electrical power demand has become a great problem. Unfortunately the conventional energy resources are limited, cause greenhouse emissions and are expected to increase in costs due to an increase in the demand. Recently, the new concept of MicroGrid has been emerging on distribution network for integration of micro generation in low voltage network and to increase the reliability of supply. A microgrid is a cluster of micro generators, loads, storage devices, control devices and a low voltage distribution network functioning in a coordinated manner. The microgrid can operate in two different modes: interconnected or emergency. In first mode the microgrid is connected with the conventional low voltage distribution network for importing or exporting electricity. In emergency mode the microgrid is isolated (islanded) with the help of control devices from the distribution network and uses local micro-generator...

OPERATION OF POWER SYSTEM ISLANDS

In this paper, a method for continuity of electrical supply to a region after disconnecting from the main network is presented. In this method, the island is protected from the total loss of supply at the price of shedding some load. In the proposed method of this paper, the case of control of the island without using an explicit communication is considered. The indirect communication between generators and loads uses frequency of the island and knowledge of droop characteristic of the generators. The process of surviving the separation and controlling the island is validated on a test system.

Microgrid: a conceptual solution

2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551)

Application of individual distributed generators can cause as many problems as it may solve. A better way to realize the emerging potential of distributed generation is to take a system approach which views generation and associated loads as a subsystem or a "microgrid". During disturbances, the generation and corresponding loads can separate from the distribution system to isolate the microgrid's load from the disturbance (providing UPS services) without harming the transmission grid's integrity. This ability to island generation and loads together has a potential to provide a higher local reliability than that provided by the power system as a whole. In this model it is also critical to be able to use the waste heat by placing the sources near the heat load. This implies that a unit can be placed at any point on the electrical system as required by the location of the heat load. Index: microgrid, distributed generation, CHP, intentional islanding, voltage droop, power vs. frequency droop, inverters