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Magnetically-coupled resonant wireless power transfer (MCR-WPT) offers a novel technique to transfer power over a long distance with high efficiency. A half bridge inverter with series-resonant structure is designed as driver source for WPT system in this paper. The frequency is up to 0.9MHz, which is very higher than traditional power electronic converter. The relationship between output power, transmission...
Wireless Power Transmission Systems (WPTSs) that use capacitive or inductive coupled resonators need to be designed at MHz frequencies to avoid large passive components. The advent of high-frequency high-power enhancement-mode Gallium Nitride (eGaN) FETs has made the idea of MHz switch-mode power inverters with higher efficiency compared to linear power amplifiers more realizable. One of the major...
This paper addresses one of the critical sections of the current-source inverter, the output filter. Firstly, the background of low-pass output line filters for voltage-source inverters (VSI) and current-source inverters (CSI) are provided. Important factors such as filter resonance and damping are explained. Then four different damped CL filter circuits are discussed and the performance of the filter...
The paper presents the energetic performances of a system used for drying of current transformer from 110 kV Ciungetu power station. In fact, the drying process is based on an induction heating system that contains a half-controlled rectifier and a voltage source inverter that operates with resonant load. Two frequencies are taken into consideration for the inverter control. The former is the resonance...
This paper considers a series resonant DC-DC converter operating above the resonant frequency. In order to control its output power, a symmetrical controlled rectifier is used, which allows bidirectional energy transfer. On the base of well-known analytical modelling of the resonant tank processes, a series for determination of the main converter quantities is proposed. As a result, the converter...
This paper presents the control method of an LCL filter implemented for a three-phase, voltage-source, grid-connected inverter for not only offering better attenuation of switching harmonics but also for highly damping the resonance. A discrete-time deadbeat current controller with tuned state-feedback gains is proposed to realize the time optimum responses with high control accuracy. In addition,...
The smart house system offer promise as an effective solution to environmental problems. An obstacle to diffusion of the smart house is the high cost of battery. An effective solution to this problem is vehicle to home (V2H) system. EVs can be used in smart house systems to supplement the energy storage. This system essentially requires a bidirectional power transfer feature between the EV and home...
LCL-filter is commonly used as an output-side filter in a grid-connected converter due to its good attenuation capability at the switching harmonic frequencies. LCL-filter creates several resonances in the converter dynamics which shall be damped for ensuring robust performance of the converter. The resonant behavior introduced by the LCL-filter can be attenuated with active damping (AD) instead of...
An alternative implementation of asymmetric cascaded H-bridge (ACHB) inverter is presented in this work. The presented ACHB inverter is using a single DC source. The main bridge is directly connected to the DC source (such as, battery, fuel cell or photovoltaic array). And the auxiliary bridges are fed by isolated series resonant converter (SRC). Voltage of the auxiliary bridge is balanced by controlling...
In this paper, based on a double-sided LCC compensation network, the leakage inductance equivalent model of the loosely coupled transformer (LCT) is built and the constant current (CC) output with load independent is analyzed in an inductive power transfer (IPT) system. This paper proposes four resonance conditions for achieving constant voltage (CV) output in various load conditions for the compensation...
Controlled Power Converters are extensively used in industrial applications as they can adapt the electrical energy as required by the application. However, these devices must be properly commutated in order to control voltages and currents. Indeed, power converters are known to be multivariable, coupled, and nonlinear systems; therefore, the control technique needs to be chosen carefully. There are...
Digital control system usually introduces a beat of delay, which includes PWM upload delay and zero-order holder delay. The delay not only reduces the system phase margin, but also changes the impedance characteristics of active damping, which influences the system minimum phase property and threatens the stability of the injected current. In this paper, a PWM real-time upload method and the detailed...
The asymmetry of the inherent distributed capacitances causes the rise of neutral-to-ground voltage in ungrounded system or high resistance grounded system. Overvoltage may occur in resonant grounded system if Petersen coil is resonant with the distributed capacitances. Thus, the restraint of neutral-to-ground voltage is critical for the safety of distribution networks. An active grounding system...
To interface low-voltage dc-output power sources to ac grid, the split dc-bus dc-ac inverters driven by step-up isolated dual-output dc-dc converters can be a solution. When the split dc-bus dc-ac inverter is loaded with single-phase ac or unbalanced three-phase ac, current ripples will propagate through the dc-dc converters at frequencies that are related to the ac side fundamental. For the dc-dc...
This paper discusses the emulation of an active RLC load by means of an inverter. To this purpose, a suitable current control strategy is analyzed and developed. The limitations of this approach are explored, highlighting the requirements of the adopted regulator in order to avoid instability issues. The proposed analysis and model of the controlled system are verified by means of simulations and...
Weak grid is commonly seen as a voltage source which contains the gird impedance and background harmonics. The grid current closed-loop control and the grid voltage feed forward control are coupled with each other because of the grid impedance. The proportion feed forward control strategy introduces a positive feedback loop, which affects the grid current quality and the system stability. This paper...
Resonant power converters have become ubiquitous to efficiently process electrical energy, however, their complicated structure challenges linear controllers in anticipating their large signal performance. Since small-signal modeling techniques do not provide sufficient information regarding the large signal behavior of power converters, nonlinear geometric controllers can be employed to tackle the...
In this paper, a hybrid control of IPT system is proposed in limited operating frequency range according to coupling coefficients. The coupling coefficient k and self-inductance of pad vary according to misalignment and vertical distance condition in inductive power transfer (IPT) system. Those variation cause change of output voltage and zero phase angle (ZPA) frequency. Proposed method enables the...
A design for the inverter circuit configuration of integrated half-bridge modules with a focus on the circulating resonant current is clarified in this paper. Although this configuration has the advantages of small DC-side stray inductance, an analysis of the equivalent circuit suggests that a DC-side capacitor current increases depending on the relationship between the resonant and switching frequencies...
This paper presents an isolated high-gain topology which employs resonant boost converter with coupled inductor or boost transformer for the Photovoltaic (PV) micro-converter system. The given configuration has the features of resonant soft switching, galvanic isolation, high gain and low switching losses. The proposed system uses LC series resonant tank circuit and had resonant operation both during...
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