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Microgrids using renewable energy generators and energy storage are being suggested as a solution to rural electrification for many developing countries, even those with existing transmission / distribution networks. This is being driven by the rapidly falling costs of both solar and energy storage. However, the technology is changing rapidly in this area and existing technical standards often do...
Thermoelectric generators (TEGs) are used for the direct conversion of heat energy into electricity. Given that there is an extreme concentration of heat present on house roofs, the application of TEGs on these locations is feasible. This study involves the modeling of thermoelectric generators on house roofs through the use of simulations and an actual prototype. Simulations were done using the matrix...
This paper joins the developing trend of modeling distributed generators based on dq0 quantities, and proposes an open-source software for modeling and analysis of large-scale power networks based on dq0 signals. The dynamic models describing the network are provided as state-space objects that are sparse and of minimal order. The software supports integration of various models of synchronous machines,...
This paper presents mathematical and physical model of permanent magnet synchronous machine which enable simulation and experimental studies of various dynamic modes of operation of electric vehicle in laboratory environment. The mathematical model is realized in Matlab programming language. It provides useful information for investigation of the dynamic modes including control strategies related...
The electric power industry is currently in transition to a new technological platform, which is based on the smart grid concept. Important components of this grid include distributed generation plants as well as those based on renewable energy sources. The centralized system of control of numerous distributed generation plants becomes inefficient due to the need for transferring large amounts of...
this paper presents results on the simulation, modeling and optimization of an off grid hybrid solar PV/diesel/battery/inverter power system for residential application. The principal objective is to design a standalone renewable energy system to meet the desired electric load with high renewable fraction, low excess power and low cost of energy. Hourly simulations and optimization were performed...
In this paper, a three-stage generator model is established based on Modelica/Dymola. Start from the mathematical model of the generator, the main generator (MG) and the main exciter (ME) are remodeled by using the Modelica language. Then, the generator control unit (GCU), the pre-exciter (PE) and the rotating rectifier model are built using components in standard library of Dymola. And Dymola is...
In this paper is presented an algorithm for estimating the wind speed by solving the non-linear model of a wind turbine (WT) using the Newton Raphson iterative method. The wind speed estimations obtained are used for computing the WT generator speed that maximize the extraction of wind power. This optimum generator speed is used as reference for the speed controller of a permanent magnet synchronous...
This paper presents a voltage control strategy based on the optimal duty cycle for a renewable energy system comprised of a Thermoelectric Generator (TEG) in cascade with the KY-Converter, a voltage-boosting topology, and coupled to a resistive load. The mathematical model that describes the TEG is presented as well as a derivation for optimal values (i.e. current and voltage) that provide maximum...
A model of a hybrid wind wave energy converter (HWWEC) system is proposed in this paper. The HWWEC includes two wave buoys and a vertical axis wind turbine (VAWT) system, which co-works to drive a generator. Wave buoys are arranged in an arc pattern to capture efficiently wave energy from many directions. The hydrodynamic forces are calculated by the Wave Analysis at Massachusetts Institute of Technology...
During a process of energy transaction in electricity market, in order to ensure electrical safety and prevent excessively quick growth of electricity price, the concept of contract for difference (CfD) is introduced. Considering the electricity characteristics of large consumers, this paper is in the views of both generators and large consumers which sign CfDs with Grid Corporation respectively,...
In order to present a new solar power generation system design, this paper describes a grid-connected generation model composed by a Dish Stirling (DS) engine, permanent magnet synchronous generator (PMSG), AC/DC converter, DC bus and DC/AC inverter. A detailed modeling is developed that considers all solar, thermal, mechanical and electrical parts of the system and implemented in MATLAB/Simulink...
In modern software engineering environments, tools that use Domain-Specific Languages (DSLs) are often applied. The usual workflow of such tools is that the textual input written in the DSL is parsed and a semantic model is instantiated. This model is later passed to another software component that processes it, e.g. a model transformation, a code generator or a simulator. Building the semantic model...
This paper introduces a new Direct Power Injection (DPI) set-up used to characterize the conducted immunity of integrated circuits (IC) with differential inputs. It allows injecting common-mode, differential-mode signals or any combination of both. For a given kind of injection, it is necessary to calculate power and phase-shift at generators. To do so, an analytic model is developed based on S-parameters...
Major concerns associated with renewable energy resources are uncertainty and unpredictability. Energy Storage Systems (ESSs) can help create more reliable and dispatchable systems by adjusting charging and discharging time and rate. In this study, an economic model is developed for a hybrid system of grid-connected solar photovoltaic (PV), Compressed Air Energy Storage (CAES), and batteries. PV generation...
This paper studies the power consumption and supply in an islanded power system (IPS) with high penetration of air conditioning load. The characteristics and behaviors of the loads in the IPS are researched and analyzed. Based on the power study, a new source and load management (SLM) system is designed to improve the power quality and energy/fuel efficiency in the power systems. In this paper, at...
The seasonal flow distribution into a hydroelectric system is analyzed, without considering reservoirs, in terms of time series for lateral energy inflows and internal flows at generating facilities. Key concepts, such as regulated and unregulated flow are defined and illustrated, in addition to peak shaving energy inputs based on station installed capacities. Therefore spilled energy is compared...
To keep a DSL clean, readable and reusable in different contexts, it is useful to define a separate tagging language. A tag model logically adds information to the tagged DSL model while technically keeping the artifacts separated. Using a generic tagging language leads to promiscuous tag models, whereas defining a target DSL-specific tag language has a high initial overhead. This paper presents a...
From local utility grids to electric ships, providing power to an ever increasing variety and magnitude of loads requires power grids that are more flexible, resilient, and efficient than ever before. In many cases, these systems must serve loads that are nearly equal to and occasionally exceed peak generation capacity. As a result, it is critical that these power systems and their controls are analyzed...
A generic problem of distributed solar home systems (SHS) is the lifetime of the chemical storage battery. In this paper, a model of compressed-air energy storage (CAES) based SHS is developed and simulated to determine the size of the storage tank according to the required load and operating time. Industrial air motors and permanent magnet direct current generator specifications are used for simulation...
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