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This paper aims to propose a secondary control algorithm based on Fuzzy Logic to adjust frequency and voltage in islanded microgrids. It is well-known, that, when a microgrid changes its operation from grid-connected to islanded mode, the time domain variability of the loads will change the frequency and voltage profiles of the system. In this sense, the operation of the system might become unsafe...
It is of prime importance in DC microgrid to stabilize dynamic behaviors of Line Regulating Converters (LRC) that connects multiple distributed generators (DGs) and loads each other. To this end, it is effective to adjust duty ratio of LRCs properly because this countermeasure can save capital investment cost. Moreover, it is better to apply decentralized control method to realize the ubiquitous DC...
In light of the inadequate state of Nigerias power sector in comparison to the US, this paper proposes a plug-and-play microgrid concept or Microgrid-as-a-Service (MaaS) for application in an urban Nigeria setting. We focus on an islanded microgrid setup wherein the microgrid will not need the grid-connectivity functionality, ceteris paribus. Under the MaaS plaform, customers can switch between the...
Load frequency control in an islanded microgrid is challenging due to the low system inertia and random power variations resulting from renewable energy sources and loads. The traditional droop control mechanism may become unstable under some conditions. To overcome this problem a new control algorithm is proposed in this paper. The necessary condition derived to ensure the frequency stability is...
In this paper, we evaluate a multi-objective-moving-horizon-optimization (MO-MHO) approach as an instrument for improvement of economic dispatch in microgrids. In particular, we investigate the effect of adaptation of the multi-objective optimization strategy used in the moving horizon framework on the end result of the economic dispatch. Power dispatch in microgrids is inherently a high-dimensional...
Autonomous microgrid planning is a Mixed-Integer Non Convex decision problem that requires to consider investments in both distribution and generation capacity and represents significant computation challenges. We proposed in a previous publication a deterministic Second-Order Cone (SOC) relaxation of this problem that made it computationally tractable for real-size cases. However, this problem is...
It is of great importance to mitigate frequency fluctuation in power systems with high penetration of renewable energy sources such as wind turbines and photovoltaics. Especially, in isolated microgrids like island power systems, frequency regulation becomes more significant because the system frequency easily changes by relatively small moment of inertia. To cover the small system inertia, it is...
This paper considers the simulation of microgrids with smart meters that make it possible to control the demand at individual consumer buildings. To create effective system-level models for simulation studies of energy management strategies, probability distributions for the aggregate demand of all system loads are computed from probability distributions for the individual loads of each consumer....
The need for designing self-sufficient microgrids to lessen the serious consequences due to power lack is obvious. This work proposes a systematic method to select the optimal components of a grid-connected microgrid subject to severe power outages. The microgrid is composed of photovoltaic panels (PV) and energy storage units in addition to the existing diesel generator. This work attempts to maximize...
Renewable energy generation has gained more and more importance not only in large power grids, but as well in small islanded microgrids. As fuel transport might be a major cost factor in islanded grids in remote locations, optimal use of the existing generation assets is of major importance. In this paper we want to present an optimal unit commitment approach that is adapted for islanded grids by...
The rise of distributed generation makes more difficult the power balance between demand and generation in electrical networks, especially by the uncertainty of renewable generation. Smart grid concepts have been developed to solve this problem. A set of generators, loads and storage devices are locally managed to minimize the energy cost. These smart grids have surpluses and deficits of energy along...
The aim of this paper is to propose a new voltage controller for Distribution System Operators (DSOs), based on a multi-objective optimization, which considers the presence of microgrids in the distribution network. This paper is focused on DSO's optimization problem, which has to minimize grid losses, and to take into account some ancillary services provided by the microgrids, such as demand response...
The operation of the off-grid system consisting of projectable PV panel array and two dieseis (one in reserve) generators SDMO J200K with 160 kW installed capacity are considered in this article. The aim of the study is to make a stability analysis of the system with an evaluation of problems can occur and their possible solutions, which keep the system operational. Three possible faults at generator,...
This work investigates the coordination control problem for multiple distributed generation (DG) units with a hierarchical control structure. At the secondary control level, an event-triggered power sharing strategy based on the concept of multi-agent consensus has been proposed for the DG coordination control. The performance evaluation results show that the proposed algorithm can achieve precise...
This paper focuses on the environmental and economic optimal operation of microgrid in grid-connected and island modes. Considering the operation constrains of microgrid, the constrained multi-objective optimization problem (CMOP) is built with the fuel cost, depreciation expense and emission cost of distributed generators as optimization objectives. The comprehensive learning particle swarm optimization...
To achieve optimal energy generation for different renewable energy resources and to control the charging and discharging functions of energy storage system by minimizing the operation cost and by satisfying the electricity demand is a seriously challenging optimization problem. The aim of the Virtual Power Producer (VPP) is to ensure the optimal scheduling of the connected units in the Islanded Smart...
In this article, authors developed a model for one particular example of microgrid and considered possibilities to integrate solar panels and power storage into existing grid with diesel generator. The choice of configuration is described and power Quasi-Dynamic simulations are performed for the verification of the model. This paper mainly focuses on reliability issues and considers probability of...
Careful design and planning is essential for successful integration of energy storage system (ESS) in a shipboard dc hybrid power system. An optimization model for resiliency enhancement and total cost reduction is proposed in this paper. The resilience of a shipboard power system with and without ESS are evaluated by means of resiliency index values under fault conditions. Furthermore, the influence...
Increasing penetration of intermittent and variable renewable energy sources (RESs) has significantly complicated smart grid operations. The uncertain nature of RESs may cause increased operating costs for committing costly reserve units or penalty costs for curtailing load demands. In addition, it is often desired to control and coordinate a battery energy storage system (BESS) in an efficient and...
Microgrid is a cluster of distributed (renewable) generation sources, storage units and loads, which, when controlled in an optimal fashion, can improve both the quality of the local power supply as well as the performance of the overall power distribution system. In this paper we present a robust control methodology for microgrids that can cope with uncertainties introduced by intermittent renewable...
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