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Electric power is commonly transmitted from one location to another without interruption through overhead transmission lines. This paper presents the impact of varying the capacitance and load on the performance of the three types of medium transmission lines (end condenser, nominal ‘pi’, and nominal ‘T’) by using the TQ NE9080 transmission line simulator. It also investigates the effects of increasing...
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 focuses on the control of three-phase brushless asynchronous excitation system (TBAES) of the aircraft wound-field synchronous starter-generator system. Since the closed-loop control of the field current of synchronous starter-generator is hard to achieve, generally, the TBAES is powered by the onboard three-phase power system during the low speed region and cut off one phase of the onboard...
GaN-FETs are attractive switching devices for their fast switching capability. However, they often suffer from the oscillatory false triggering, i.e. a series of self-sustaining repetitive false triggering induced after a fast switching. The purpose of this paper is to derive a design instruction to prevent this phenomenon. According to the previous study, the oscillatory false triggering was found...
Wireless charging of electric vehicles (EVs) is going to play a major role in electrification of transportation. This paper proposes to utilize an LCL tuned primary and series tuned secondary with a secondary buck regulator to achieve power transfer control by secondary side control only. Analytical expressions for base (primary) coil current and transformer turns ratio N required to transfer the...
The majority of wireless power transfer (WPT) systems transfer power in a directional manner. Recently, omni-directional WPT systems have been addressed by several research groups. This paper describes a discrete exciting voltage control technique for wireless power transfer via magnetic resonant coupling with multiple orthogonal transmitter coils which can maximize the power transfer efficiency in...
A maximum power point (MPP) tracking technique for electromagnetic energy harvesters is presented. The concept is based on using a bidirectional AC/DC converter to simultaneously counteract the effect of the output inductance and match the output resistance of the harvester, in order to perform maximum power transfer. The modulating signal for the AC/DC converter is generated by sensing and processing...
This paper provides an experimental discussion on a power hardware-in-the-loop-simulation (P-HILS) system for a medium-voltage, high-power, high-speed synchronous-motor drive. It consists of two identical modular multilevel double-star chopper-cell (DSCC) converters connected in front-to-front (FTF) without ac-link transformer. One DSCC inverter acts as a “real inverter under test,” while the other...
This paper is dedicated to apply Hilbert-Huang Transform (HHT) method on fault detections of a multi-phase generator — diode rectifier set. The system structure, principle of the HHT, and part of the fault detection simulation results are shown in this paper. The applicability of HHT on fault diagnosis of a multi-phase machine system is illustrated by analyzing the simulation results.
This paper proposes an improved partially interleaved structure for high-voltage (Several kV) high-frequency (Several hundred kHz) multiple output applications. Six structures are compared with the leakage inductance, AC capacitance and the rate of AC/DC resistance taken into consideration. The proposed structure features lower leakage inductance, smaller AC capacitance and lower rate of AC-DC resistance,...
This paper investigates the problem of accurate active power sharing in virtual flux droop where flux angle droop control is used for DG controllers instead of traditional frequency droop control. Firstly, the virtual flux droop control method is introduced. Then, the reasons for inaccurate active power sharing in flux angle droop are analysed. Further, to solve this problem, an active power compensation...
This work shows analysis and design of a non-inverter asynchronous buck-boost dc-to-dc converter as a battery charger for an MPPT solar system. Circuit design, simulations and implementation are also shown for a solar panel with variable load.
In our tool, PowerSynth, fast calculation of electrical parasitics is of paramount concern when evaluating the layout of an MCPM during multi-objective optimization. To this end, this work extends the current capabilities of PowerSynth to quickly and more accurately extract lumped RLC parameters by utilizing a response surface model. An MCPM is represented as a series of layers forming a stack corresponding...
On-load tap changer (OLTC) is essential in regulating the operation status of power transformers employed in modern power systems. While exploring power flow analysis, electromagnetic and electromechanical simulations by using the on-load tap changer, it is found that inaccuracy problem may occur with the assumption in conventional transformers that tap positions only affect the turns ratio parameter;...
In the paper is used the Simpowersystems program which is used for calculating the static mechanical characteristic and operating characteristics within the range of variation of rotor slippage. Also, the program can be used to determine the starting moment corresponding to the rotor resistance and reactance values in the startup process. This program does not allow for the modification of rotor parameters...
For an islanded microgrid, load power should be properly shared among multiple distributed generation (DG) units, not only for the fundamental power but also for the harmonic power. In this paper, the operation of microgrids under imbalanced and nonlinear load conditions is studied, and a dynamic consensus based power controller is proposed for DG units to realize enhanced power sharing performance...
Passive elements are indispensable in RF systems and are used for matching networks, LC tank circuits, filtering, … etc. Passive elements can be simply classified into distributed elements including transmission lines and waveguides. As the operating frequency moves into the microwave spectrum, the distributed circuits have a higher Q factor, and thus they are usually used for high-frequency applications...
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...
Magnetic coupled resonant wireless power transmission technology has broad prospects for development; this paper takes this as the object of study. Based on the traditional wireless power transmission system, a new three-winding system is proposed. Firstly, the transmission efficiency expressions of two systems and the factors influencing the efficiency are derived. Secondly, based on the chaotic...
High power pulsed power supply is the basis of electromagnetic emission. In this paper, the capacitor voltage limit mode and non-linear resistor voltage limit mode power pulsed power supply are common models. In this paper, two circuit modes based on high temperature superconducting (HTS) pulsed transformers were introduced and the working principle were analyzed respectively. In accordance with the...
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