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This paper chooses the AC induction motor drive system as the main subject and conducts research of its electromagnetic compatibility (EMC). First of all, the high-frequency common-mode model of ac induction motor model was established. Secondly, the mechanism and coupling paths of the drive system electromagnetic interference (EMI) were analyzed. Focused from inverter circuit structure optimization...
As the demand for electric power grows continuously, there are more AC and DC lines sharing the same corridor because of economic and ecological reasons. One of the problems is the induced fundamental frequency voltages and consequent circulating current on the DC lines by the coupled parallel AC lines. The LCC-MMC hybrid transmission system is quite suitable to transmit bulk power over long distance...
A microcontroller-based electronic ballast for electrodeless fluorescent lamp (EFL) is implemented in this paper. The main circuit consists of a class D converter and a resonant circuit to form a resonant inverter. In addition, an 8-bit microcontroller is employed to act as the control core of the system to achieve soft start and smooth dimming feature. Moreover, we not only discuss the lamp model,...
The authors have proposed a new capacitive power transfer (CPT) system using one-pulse switching active capacitor (OPSAC). The proposed system improves transfer power without LC resonance so that it is robust against parameter change. The one of advantages of OPSAC is easy realization of cascade connection in order to enhance transfer power. In the past, CPT system with five-stage OPSAC was successfully...
This paper fabricated Class-D switching inverter critically effect to power efficiency of wireless power transfer system and presented equivalent circuit to magnetically coupled resonator. We analyzed Voltage and current of resonator's each node and in order to verification, observed power transfer characteristics of cascading Class-D inverter, magnetically coupled resonator and 50Ω load. Through...
In this paper, the combinations of coupled inductors (CIs) and LCL filters are comparatively investigated for grid-connected interleaved three-phase voltage source inverters (VSIs) in terms of the resonance phenomenon. In current-controlled direct parallel VSIs, two current controllers are required for the power flow and the circulating currents. Therefore, the stability of both current controllers...
This paper proposes a nonlinear reduced-order model of a grid-connected AC Microgrid as seen from the point of common coupling (PCC) to the grid. The model is based on the dynamics of a single droop-control generator and aims to reproduce the behavior of the low-voltage grid with a minimum set of parameters. The model is first derived considering an infinite bus at the PCC, showing the fundamental...
Current technology developments in energy storage and PV systems raise new possibilities for combining them, in order to deal with grid integration of PV systems. This paper studies the operation of a very large scale PV power plant, which includes an energy storage system for capacity firming. The energy storage is distributed in the PV plant, i.e. many energy storage units are connected in parallel...
Paralleled grid-connected inverters with LCL-filters are coupled through the non-negligible grid impedance. However, the coupling effects among inverters and grid are usually ignored during the design, which may lead to unexpected system resonance and even instability. This paper thus investigates the resonance characteristic and stability analysis in multi-paralleled grid-connected inverters with...
Islanding detection is required for both microgrids and individual distributed generations (DGs). Several methods exist in literature but they are with some limitations. In this paper a new scheme is proposed which doesn't fall under any of the existing methods. Cross coupling in control action between the components Id (direct axis component) and Iq (quadrature axis component) is introduced by a...
The direct torque and stator flux control (DTFC) for PMSM drives has been used as in many applications [1]-[3]. In traditional DTFC system, the stator flux linkage is estimated by integrating the induced voltage vector. The stator voltage vectors could either be measured by sensor or re-constructed using inverter switching status and the DC bus voltage. However, the measurements of voltage pulse trains...
This paper presents a new capacitive wireless power transfer (WPT) system that achieves effective power transfer even with very low values of coupling capacitance between two metal plates separated by an air-gap. A prototype of the proposed capacitive WPT system has been built and shown to transfer 30 W across two 5-cm by 5-cm metal plates separated by an air-gap of 0.5 cm. The power transfer per...
This paper introduces a new capacitive wireless power transfer approach with the potential to significantly enhance power transfer density in large air-gap applications. This enhancement is achieved through the use of multiple phase-shifted capacitive plates that reduce fringing fields in areas where field levels must be limited for safety reasons. The effectiveness of the proposed approach is evaluated...
This paper presents a RIC-WPT system with class-E inverter and class-DE rectifier along with its analytical design procedure. By using the class-E inverter as a transmitter and the class-DE rectifier as a receiver, the designed WPT system can achieve a high power-delivery efficiency because of the class-E ZVS/ZDS conditions in both the inverter and the rectifier. In the experimental results, the system...
This paper emphasises the modelling and control of a voltage source converter (VSC) for three phase grid connected PV system. The transfer functions for inner current control and outer DC link voltage control for VSC are derived. The controllers for VSC are designed based on PI and K factor control methods and the performance of VSC using both the methods are presented with the simulations performed...
We have designed a prototype wireless power feeding system to the ornamental robot fish, considering it also as a preliminary experiment for application to the capsule endoscope. We insert a solenoidal resonator instead of the button battery in a robot fish, and send power wirelessly from the resonators which are placed above and below the aquarium. In order to mitigate the high voltage induced in...
Asynchronous automata networks are commonly used to describe discrete-event systems consisting of several components. The components used here behave asynchronously since this is usually the case for a large class of automation systems. The asynchronous behavior is based on the ability of certain components to change their state regardless of other component's behavior in the network. This paper deals...
When several high voltage direct current (HVDC) systems simultaneously recover after severe faults, absorbing large amounts of reactive power from the receiving AC systems, presents new challenges for the transient voltage stability of multi-infeed HVDC (MIDC) systems. Actually DC power recovery characteristics could be controllable to some extent by selecting voltage dependant current order limiter...
In order to improve reliability and safety of an In-Wheel Motor, the Wireless In-Wheel Motor (W-IWM) using magnetic resonance coupling has been proposed. Transmitting power of the W-IWM is controlled by the primary inverter and the secondary converter. One of a technical issue of the W-IWM is transmitting power variation due to the load power variation and the coupling coefficient variation. In this...
The goal of this paper is to compare different solutions for the parallelization of grid side voltage source converters operating in medium voltage for application in multi-megawatt (MW) offshore wind turbines. The study takes into account different alternatives in terms of both topology and modulation: in particular it considers whether the DC busses are common or separated, the output filters are...
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