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This paper presents an alternative model of a grid interactive photovoltaic (PV) system which can be used for characterising the harmonics from a PV system when connected to a distorted and undistorted network respectively. The approach uses an orthogonal series function in modelling the different sections of a practical PV system thus yielding a complete harmonic domain model. The proposed model...
In this paper, a detailed model of a 2 MW wind turbine system with a permanent magnet synchronous generator (PMSG), including the aerodynamics, the mechanics, and the electrical domain is presented. It is then used to examine the influences of the level of detail in the model of a wind turbine system on the calculated lifetime consumption of the converter's power modules. This is done by comparing...
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
A general method for the evaluation of small-signal input impedances of power converters is presented in this paper. The method is based on harmonic linearisation and Fourier analysis techniques and a single-phase boost PFC is considered as case study. The analysis is based on the average model of the converter but no further approximations have been made and both voltage and current loops are included...
This paper presents a comprehensive simulation model of a DC traction system with vector control drive. The model of two substation rectifiers in one track section with the conventional two-level traction drive has been proposed which is according to the real situation. The traction motors and a detailed traction load are also included in the model. Analysis and conclusion of simulation results are...
Active power filtering is one of the most promising and mature technologies used for eradication of harmonics in power systems. This paper presents the implementation and simulation of shunt active power filter with diode rectifier connected to RL Load. Generation of reference fundamental load current signal is done without calculating load active power. The simulation results are analyzed and THD-I...
Self-excited induction generators (SEIG) are used in small scale generation systems such as small wind turbines and micro-hydro schemes where a grid connection is not available. In such applications, there is a strong need to model the generator as accurately as possible in order to obtain a realistic estimation of the machine behaviour and dynamics. In this paper, a generalized dynamic model of a...
This paper presents an extension to the switched capacitor DC-DC converter model when supplying loads stacked vertically. Stacking loads vertically drastically reduces the required size of a DC-DC converter, as it only needs to supply the mismatch current between the loads. Furthermore, when loads are perfectly matched, efficiency is only limited by the power consumption of the control loop, achieving...
This paper describes a graphical user interface (GUI) tool designed to support cell design and development of manufacturing processes for an automotive battery application. The GUI is built using the MATLAB environment and is able to load and analyze raw test data as its input. After data processing, a cell model is fitted to the experimental data using system identification techniques. The cell model's...
According to growing of DC loads such as LEDs and computers, DC Microgrids will play an undeniable role in power systems in future. One of important power sources in DC Microgrids is photo voltaic (PV) unit which usually is composed of PV panel, super-capacitor (SC) and battery. In this paper, using models of PV panel, SC and battery, an improved method is suggested for providing the load power by...
In the near future anthropomorphic robots will turn into an important part of our everyday routine. To successfully perform various tasks these robots require stable walking control algorithms, which could guarantee dynamic balance of the biped robot locomotion. Our research is focused on the development of locomotion algorithms which could provide effective anthropomorphic walking of a robot. As...
The aim of this paper is to implement a modified Perturb and Observe algorithm (P&O), in order to solve the oscillations problem of photovoltaic (PV) power output generated by the conventional P&O algorithm. A comparison between the novel and the basic P&O algorithms is made. The first is implemented using embedded C language; the second is implemented using analog blocks. Next, the simulation...
Predicting the capacity of wireless mesh networks is difficult, due to the complex interaction of various layers such as the radio environment, media access protocols, network protocols and, traffic load and types. When modelling and simulation takes into account the interaction of all these factors, it can facilitate insights into anticipated network behaviour. These insights can be used to more...
Electrothermal design and optimization of motor drive systems for automotive electric drivetrain applications requires simulation methods to handle large differences in timescale and component modelling across multiple physical domains. This paper presents an approach based on model-reduction and co-simulation techniques using commercially available finite element method (FEM) and circuit/system simulation...
To reduce the blades asymmetric loads of large wind turbines operated in the above-rated wind speed region, this work proposes a model predictive individual pitch controller with the linear interpolation model. Results show a significant reduction of 1P (once-per-revolution), 2P, 4P blade asymmetric loads within the limits of pitch rate. The proposed model of wind turbine can describe the characteristic...
In this paper, we present the fundamental principles of power distribution over single busbar network and the relevant mathematical models. Subsequently, we investigate into the impact of the load voltage fluctuation on the system reliability and the impact can be quantified by employing several state-of-the-art statistical models. Specifically, we analyse the reliability and performance of distribution...
The importance of energy storage technologies is being recognised by more and more power system professionals lately. If properly designed, installed and operated, storage can provide flexibility, and be a valuable component of future electricity networks. Although regulatory and market conditions still have to be improved, the potential of energy storage is unequivocal. As power companies are seeking...
A hardware-in-the-loop (HIL) model of a vessel electric propulsion drive is proposed. The mathematical description of the vessel trust forces is explained. As well, the propulsion power and torque estimates are discussed within the broad spectre of their parameter changing. A case study is reported where some concrete parameters are applied in the above mathematical model to assess the particular...
This work focuses on the modeling and the identification of the parameters of the impedance model of a PEM fuel cell. It is based on the Randles model represented by specific complex impedance at each cell. We have used the "Least square" method to determine the parameters model using measured reference values. The proposed authentication method is valid for Randles model, but it can be...
The paper describes the development of a dynamic model of a microturbine system. The paper was done in close cooperation with the gas turbine manufacturer Turbec AB and the model was tuned and verified against their microturbine system T100. The microturbine unit consists of a compressor and a turbine connected on a single shaft to a high-speed generator. The model includes all the main thermodynamic...
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