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With the increase of operating frequencies of switching devices, the size and weight of power converters are reduced. However, the impact of parasitic parameters becomes significant, which affects the performance of power converters. Compared with a simple equivalent circuit of filtering inductors, a detailed lumped circuit model is more suitable for the study of the behaviour of the inductor at high...
This paper proposes a junction temperature estimation method for IGBT power module in three-phase inverter through coupling the temperature-corrected power loss calculation model and Foster thermal model. Considering the structural characteristics of IGBT, the loss calculation model is established with full study about the influence rule of temperature, gate resistance and other factors on the loss...
Enclosure circulation of Gas Insulated Switchgear (GIS) and Very Fast Transient Overvoltage (VFTO) are harmful to many respects of power system, including system's security, stability and economic. The effective inhibition of GIS enclosure circulation and VFTO has attracted wide attention. In this paper, GIS enclosure circulation and transient ground potential has been modeled and analyzed. Firstly,...
In this paper a control algorithm is developed for a small photovoltaic panel in order to maximize its generated power. The objective is to develop a numerically simple to implement method to control a buck dc-dc converter. The basic idea behind this research is to create an optimization block to determine the maximum power point according to the current radiation and temperature and to use its output...
In this paper, a novel modeling method of battery pack for an optimal design and effective managements of battery is suggested. The proposed modeling method using single cell information makes an optimal design of battery pack possible by expecting the characteristics of the battery pack before the battery pack is manufactured. Also, the proposed battery pack model can be highly utilized in the battery...
Hydro-generators with skewed armature slots have damper interbar currents that flow transversely between the damper bars through the core. The interbar currents may involve harmonic and local overheating issues. The interbar resistance is a vital factor that affects the distributions of interbar currents and damper bar currents. A multislice finite-element model with integrated interbar circuit is...
Ramsey theory assures us that in any graph there is a clique or independent set of a certain size, roughly logarithmic in the graph size. But how difficult is it to find the clique or independent set? If the graph is given explicitly, then it is possible to do so while examining a linear number of edges. If the graph is given by a black-box, where to figure out whether a certain edge exists the box...
This paper presents the design and experimental demonstration of a method for photovoltaic condition monitoring and hot-spot detection using a real-time adaptive parameter identification approach. The identification algorithm tracks parameters in an equivalent ac circuit model of a PV panel, and uses these parameter estimates to predict when the PV panel is partially shaded or in a hot-spot condition...
As insulators play an important role in supporting power transmission and distribution system, ensuring their condition in order to keep working properly have become an unequivocally essential task to do. There are many ways that can be attained to monitor the state of insulators, which one of them is by observing the leakage current (LC) characteristics. Experiments of LC measurement on six field-aged...
The parameters of the resistance model are obtained through various experiments under different lamp power in this study. Polynomial fitting curves are obtained for these parameters to get the values under some certain lamp power. Then simulations in PSIM are conducted by using the calculated values to verify the reliability and accuracy of the method adopted. Good agreement is obtained between the...
Numeric simulation and experiment comparison were used to determine the component parameter of GIS which have also provided a dynamic circuit model. The physical process of arc re-ignition is studied based on the theory of arc energy conservation in this paper. Mayr-Schwarz arc equation is applied to establish the model of arc resistance model. A new transient circuit model which simulated disconnector...
The structure and working principle of hybrid energy storage system are introduced. The classical RC model of ultracapacitor is analyzed, and the topology of charging and discharging converter of energy storage system is studied. A ultracapacitor-battery hybrid energy storage system model based on bidirectional boost-buck circuit is constructed, and the charging and discharging process of the energy...
Arcing fault has been a challenge problem in power network, and it is difficult to be detected by traditional protection devices because of its low fault current level. This paper presents a method to model and detect arcing fault in a power system with renewable energy generation in Matlab/Simulink. All-phase FFT is adopted to detect and identify the arcing fault. It has been shown that all-phase...
In this paper we propose an approach for the determination of static force characteristic of a plunger-type AC electromagnet using 2D numerical model developed in QuickField software. The attraction electromagnetic force is calculated using Maxwell stress tensor method. The numerical model is an AC magnetics problem coupled with the coil electric circuit. The numerical model has been experimentally...
In this work we present the realization of a hybrid model (hardware-software) for memristors based on the nonlinear dopant model for three window functions: Strukov, Joglekar and Prodromakis. Proposing a methodology that allows us to design nonlinear analog circuits with memristors in an easier and faster way using the tools of Simulink, Simscape and System Generator. In addition, we tested the functionality...
In this article the injection locking effect in terahertz (THz) resonant tunneling diode (RTD) oscillators is studied using a circuit simulation method. The simulation model is implemented in a popular simulator called Keysight ADS for ease of use and effective investigation. The locking phenomenon is successfully observed. Pulling range, locking range, locking conditions and influence of antenna...
This paper presents the study, design and simulation of a laboratory module related to filters. With this laboratory platform it was accomplish a comparative study between current feedback (CFA) and voltage feedback (VFA). Because the laboratory platform has an educational role, it was presented some practical aspects of active filters measurement and also the differences between the measured values...
We developed a high-current-density, point-of-load (POL) converter for high performance Field Programmable Gate Array (FPGA) used in telecommunications systems. We applied the model-based development (MBD) method to realize the high-current density converter. Model in the loop simulation (MILS) was applied for precise loss analysis of the converter. The rapid control prototyping process (RCP) was...
More Electric Aircraft (MEA) is a promising aircraft, replacing air pressure system, hydraulic systems and mechanical systems by power system. Nevertheless, the increase of electrical equipment inevitably leads to more problems in aircraft safety problems, of which the arc fault has a great influence. This manuscript is aimed at series arc in because it's not easy to detect. To solve the problem of...
This paper presents a novel procedure to determine the internal gate-source voltage inside a multi-chip power module using the example of a SiC half bridge module. Based on the lumped elements of the gate circuit calculated by a quasi-static electromagnetic simulation, each field-effect transistor is represented by a single, voltage dependent capacitor. The procedure is validated by clamped inductive...
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