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The symmetrical compensation is widely used in inductive power transfer (IPT) system due to the advantages of achieving good coupling coefficient when the coils are perfectly aligned and easy to design. This paper investigates a general tuning method for voltage-fed symmetrical higher-order resonant networks for achieving load-independent transconductance. With the proposed tuning method, a resonant...
This paper presents a unified selective harmonic compensation strategy using DG-interfacing inverter with LCL filter in the presence of nonlinear local loads for both grid-connected and islanded microgrid. Compared with the existing harmonic compensation methods in the literature, the proposed strategy consists of a triple-control-loop in the grid-connected mode to compensate the grid current harmonics...
The LLC resonant converter operating at constant switching frequency by interleaving technique has been analyzed using MATLAB/Simulink. The LLC resonant converter has the advantages of high efficiency, high power density, and low cost. They can be operated at no load condition and at resonance for nominal input voltage. The load sharing problem of LLC resonant converter has been overcome by SCC (Switch...
In this paper, a full bridge LLC resonant converter topology is studied due to its high efficiency, high power density and low EMI emissions. Under the operation of wide input voltage and load variations, a robust control using second order sliding mode technique is proposed for the LLC resonant dc/dc converter. Firstly, a nonlinear model of LLC converter is obtained via the extended describing function...
In this paper, a new common capacitor current sharing method is proposed for multi-phase LLC resonant converter. Automatic current sharing is achieved by using a common resonant capacitor for all the LLC resonant stages, by connecting the resonant capacitors in each phase in parallel. The proposed method can automatically share the load current without any additional circuits and control strategy...
This paper presents a methodology to obtain an optimized model of a Radial Piezoelectric Transformer with primary and secondary at same piezoelectric ceramic surface. Three-dimensional simulation by Finite Element Method is utilized as analysis tool. Methodology aim is obtaining an improved accuracy model for low cost Piezoelectric Transformer samples. Finite Element analysis was done in order to...
In this paper an interleaved soft switching boost converter (ISSBC) for a photovoltaic power generation system is presented. This topology uses a resonant soft switching technique and hence the switching losses are minimized. Performance comparison is made between a single switch soft switching boost converter (SSSSBC) and the ISSBC converter. It is proved that the ISSBC topology is superior to the...
An equivalent circuit model of improved electric resonant structure loaded by lumped components is presented in this paper. The relative resonant characteristics are detailed analyzed and the main factors effected on the bandwidth of transition from zero to pole transmission points are retrieved. An commercial simulation software of Ansoft HFSS is used to validate our theoretical analysis. Then, a...
Shunt capacitors are extensively used in power system for reactive power compensation. Due to the existence of harmonic sources such as arc furnaces, harmonic-producing loads the possibility of harmonic resonance significantly increases. Switching shunt high voltage capacitors may cause over- voltages and this may damage the equipment considerably. In this paper the voltage profile and power losses...
This paper presents a novel extended Kalman filter based method for estimating and tracking the RLC load resonance frequency. Assuming the load like an RLC circuit, state-space equations of the system is derived. A nonlinear time-variant model of the circuit is developed and an extended Kalman filter is performed to predict the performance of the system by estimating the real-time resonance frequency...
In this paper a switched reluctance machine is used as an AC switched reluctance generator. Each phase resonates with a parallel capacitor and the circuit is tuned to match the generation speed. It is shown that in each phase of the experiments energy flows from the prime mover to the machine and the opposite within each cycle. The superposition of all the phase energy flows results in unidirectional...
3-phase AC-drives for HVAC applications (heating, ventilation & air-conditioning) typically employ a passive diode rectifier and an electrolytic DC-link capacitor to filter the rectified line voltage. The DC capacitor may be accompanied by AC or DC-chokes for harmonic line- current reduction. Recently, commercial HVAC drives, where all traditional passive rectifier components are replaced with...
A metals plant contains large 12-pulse rectifier loads and a single-phase induction melting furnace. Recently, the available fault current from the utility increased by 50% due to line improvements. Previously, the capacitor fuses on the induction furnace blew occasionally and replacing them solved the problem. After the utility line improvements, replacing the fuses does not solve the problem, and...
A novel compact coupled planar resonator (CCPR) based VCO (voltage controlled oscillator) using mode-coupling technique was developed in response to expensive high Ceramic and SAW resonators based signal source for wireless communications. One of the problems related to the conventional Ceramic/SAW based resonators (with high Q and low phase noise) is the challenge for integration in IC form. Instead...
The next generation of wireless communication is a ubiquitous radio system concept, providing wireless access from short-range to wide-area, with one single reconfigurable and adaptive system for all envisaged radio environments. This paper presents the design approach of RCO (reconfigurable concurrent oscillator) that simultaneously generates two or more signals of different frequencies that eliminate...
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