Coordinated control of smart microgrid during and after islanding operation to prevent under frequency load shedding using energy storage system
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This paper presents dynamic models of distributed generators (DG) and investigates
dynamic behaviour of the DG units within a microgrid system. The DG units include micro
turbine, fuel cell and the electronically interfaced sources. The voltage source converter is
adopted as the electronic interface which is equipped with its controller to maintain
stability of the microgrid during small signal dynamics. This paper also introduces power
management strategies and implements the DG load sharing concept to maintain the
microgrid operation in standalone, grid-connected and islanding modes of operation. The
results demonstrate the operation and performance of the microturbine and SOFC as
distributed generators in a microgrid.
Keywords: Microgrid, Distributed Generation, Microturbine, Fuel Cell
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The many different islanding detection methods for anti-islanding protection in power system are discussed. Passive, active and remote techniques are reviewed. Most of the ldquoactive methodsrdquo discussed are developed for photovoltaic (PV) as a distributed energy resource. Some recent methods can be use for any type of distributed generation. A final comparison of active islanding detection methods is presented later in this paper.
Islanding
Distributed Power Generation
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Solar energy is a green energy and nearly no carbon traces are present. Hence, the growing demand and challenges to meet the electricity requirement even in remote places can be achieved with a solar microgrid. A microgrid when coordinately controlled, can be operated both in grid connected mode and intentional islanding condition. In this paper various synchrophasor assisted control scheme for intentional islanding of utility microgrid are analyzed. Also reviews on various strategies to develop HIL for fast and accurate islanding and coordination control are presented. To overcome generation and demand mismatch study of various centralized adaptive load shedding scheme is investigated.
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Distributed Power Generation
Mode (computer interface)
Load Shedding
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During the last decade, microgrids are attracting a significant attention due to their numerous advantages. Amongst them, the most important one is their ability to operate either in grid-connected or in islanded (autonomous) mode. However, the transition between the two modes can be challenging in terms of maintaining the stability and integrity of the microgrid. In this paper, an optimization-based islanding methodology is developed to ensure a timely and smooth transition from the grid-connected to the islanded mode. This is achieved through shedding loads, by defining the generation level ofthe photovoltaics (energy spill) and by regulating the charging/discharging rate of batteries. A resynchronization method is also presented along with the requirements that need to be satisfied for the smooth reconnection of the microgrid back to the main grid. The effectiveness of the proposed approach is demonstrated through simulation results for the events of surplus energy production, and excess energy demand of the microgrid.
Microgrid
Islanding
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Citations (15)
Traditional central power supply and distributed generation have the advantages and limitations themselves.Microgrid technology can integrate the advantages of distributed generation and that makes for large scale new energy and renewable energy power generation system connected to the grid.First,the definition and the basic structure of microgrid are represented,then the main forms of distributed resources and storage energy are introduced.Three kinds of control strategies for microgrid are offered preliminarily.In the end,emphasis is put forward for future research in microgrid.
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<p>To solve the energy consumption demand of the world and environmental problems in the future the distributed generation is considered an alternative approach. In this paper a new passive islanding detection technique was proposed for the Hybrid distributed generation (HDG) system based on changes in negative sequence voltage (NSV) and currents during an unintentional islanding. Islanding is caused in the distributed generation system due to failures in the power grid. As per distribution energy resources interconnection standards, it should be detected within 2 sec with the equipments connected to it. It is difficult to detect islanding during zero power imbalance condition. Sequence analyzer will separate the positive, negative and zero sequence components of voltages and currents from the voltages and currents obtained at the point of common coupling (PCC). During a wide range of power imbalance conditions the change in negative sequence voltage and currents are examined for islanding detection. The simulation shows that this method is free from Non detection zone, even at zero power imbalances between load and distribution generation. The computer simulations made in Matlab/ Simulink laboratory show the effectiveness of this method</p>
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In common practice a Microgrid can operate while connected to a MV network. When a preplanned or unplanned event like holding or occurring fault occurs in the MV network it is possible to cause the islanding state in the Microgrid. In this Paper the operation of the MV network in the islanding mode and how to control the Microgrid by using the controlling structure are investigated. In this paper the conventional droop method has been described and a new controlling methods for controlling the Microgrid are also proposed which in the first method the AC power theory for the controlling of the Microgrid. For comparing these two methods with the controlling method which is proposed in reference [14], these three methods have been simulated with PSCAD/EMTDC software.
Microgrid
Islanding
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Citations (9)
Islanding refers to the situation where a Distributed Energy Resource (DER) remains as the sole power supply for a specific section of a power system, even after the main utility grid has been cut off. Suitable islanding detection is crucial to maintain the stability and dependability of a power distribution system that includes DERs. Islanding detection using easy-to-implement passive techniques exhibits a cost-effective response. The purpose of this study was to examine the causes and effects of islanding that a system can experience and propose a passive islanding detection method that uses ROCOPAD. The effectiveness of the proposed method was assessed using a MATLAB Simulink-based power system integrated with multiple Distributed Generations (DGs). The results showed that the proposed ROCOPAD-based islanding detection provided the best results. Evaluation metrics, including detection accuracy, false operation, and detection time, highlighted the effectiveness of the proposed approach.
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Citations (2)
Abstract This paper presents the developed Adaptive frequency islanding system for distributed generation energy districts. The research is initiated due to the changes of power system structure, increasing the share of distributed generation. At the same time the existing islanding systems have a number of disadvantages, which leads to generation-shedding of distributed generation objects while allocating them for isolated operation. This is primarily due to the low speed of existing islanding systems. The solution to this problem can be an Adaptive frequency islanding system, which is high-speed and evens out the power balance in the distributed generation energy districts at the time of its allocation to isolated operation. The operating principle of this system is to determine the amount of control actions and their issuance at the substation of distributed generation energy districts based on the assessment of the electric power system mode and energy district real-time parameters.
Islanding
Power Balance
Mode (computer interface)
Distributed power
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In the present times, distributed generation has acquired lots of importance in the power industry. The consequences on the power system develop further significance with the increase in the contribution of distribution energy resources to the electric power production. Nowadays islanding has become a major issue with increase in use of Distributed Generators (DG) in power system. When a part of distributed system becomes electrically separated from the rest of the system and the DG(s) in the isolated portion continues to power the local loads, then this condition is termed as Islanding condition. In this paper, for the detection of islanding in distributed generation, we have used the wavelet transform which is due to the negative sequence component of current and voltage. The islanding condition is further detected when the detailed coefficient at the level-1 (d1) evidently isolates the event.
Islanding
Distributed Power Generation
Distributed power
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Citations (25)