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This paper describes the design of different intelligent control techniques including fuzzy logic and adaptive neuro-fuzzy inference system, using the output voltage as a feedback in order to enhance the dynamic and transient response for DC-DC converters and specifically boost converters. The implementation was achieved using MATLAB and Simulink simulation tools. Simulations were performed for different...
This paper presents the design and implementation of a high frequency magnetic resonant coupling wireless power transfer (WPT) for middle power charging applications. The size and efficiency of resonator are depending on the resonant coupling frequency in the WPT system with magnetic resonant coupling. To improve the WPT efficiency, power capacity and resonator size, a high resonant coupling frequency...
This paper proposes a soft switching type dc-dc converter. To suppress noise levels, reformed delta-sigma modulation circuit is introduced. To reduce switching loss, the proposed converter also introduces soft switching technique.
Copper metallization and copper wire bonding of high power semiconductor devices have attracted growing attention in recent years due to potentially much improved reliability and increased lifetime. However, significant technical challenges still remain for its wide commercial use. Here a thick copper layer has been successfully grown onto 3300V fast recovery diodes and subsequently 16mil copper wires...
This paper presents a novel resonant based, high power density power electronics converter solution for mid-feeder voltage regulation of a low voltage (LV) distribution network. Owing to the use of high switching frequency operation and a full soft-switching control strategy, the proposed converter is capable of superimposing LV compensation into the feeder voltage, to achieve a significant system...
Differential power processing (DPP) has demonstrated its significant advantage of high system efficiency for photovoltaic (PV) applications especially in mismatch conditions. In this paper, a sub-module DPP based PV optimizer using a self-adjusted time-sharing maximum power point tracking (MPPT) control strategy is proposed, which can achieve fast and accurate tracking of all sub-modules' maximum...
The power series described in this paper are designed while preserving the cross-section of the machine. All basic approaches to create the series are discussed and the suitable elements of the series are chosen. Finally, the properties of the selected motors are compared, especially the parameters of the equivalent circuit.
The design of current controller of voltage source converter connected to the grid through an LCL filter becomes more and more challenging because of the LCL filter resonance behaviour and the uncertainty of the grid impedance value which may lead to instability problems. In this context, a robust active damping control for LCL filtered grid connected inverter under grid inductance variation is proposed...
Future HVDC systems may connect offshore wind farms via uncontrolled diode rectifiers instead of VSC-HVDC converters. Due to this wind turbine inverters must own a grid forming capability. This paper describes a control strategy that requires only minor changes in the conventional wind turbine inverter control software to form the AC voltage in the offshore island grid connected via diode rectifier...
Article denotes a new approach for development equivalent electrical circuit of lead-acid batteries. It is based on a separated representation of chemical and electrical domains. Main advantage of the proposed simulation method is more accurate description of the battery behavior in different dynamic regimes without the need of additional fitting equivalent circuit parameters.
In this paper, an analytical calculation method of chaotic spectrum for DC-DC converters under CPWM is firstly proposed based on Fourier series. The proposed method can be employed to precisely calculate the spectrum of PWM waveforms under CPWM. Simulation and experimental results both verify the correctness of the proposed spectrum calculation method.
Power GaN HEMT components offer very interesting performances (high voltage, high current, low on-resistance, fast switching), but the GaN material has some “defects” that can lead to carrier trapping, which induces dynamic electrical phenomena. Thereby, static measurement of the GaN HEMT components requires some reconsideration. In this work, we analyze how the typical static electrical parameters...
Conventional researches about network harmonic suppression generally assumed the network was linear and individual at various frequencies, which ignored the coupling relations of nonlinear loads. This paper studies coupling characteristics by matrix model. Through simplifying matrix model, a novel online control method of active power line conditioners (APLC) was proposed.
Poly-phase systems have been used for many years in machines and recently in wind power generations. Typically, this system employs diode rectifiers, however, it may be improved employing active rectifier. Considering it, this paper proposes a six-phase active rectifier topology controlled in synchronous frame reference. Results were validated by simulation.
The fuse is a very important component for the protection of power electronic devices. There are several parameters for choosing. Inrush energy is considered as an important parameter. This paper presents the calculation of the fuse melting point by inrush energy and determination of the eligibility. The testing set has been designed as case study.
This paper presents a highly configurable DC/DC power supply fed by the popular USB port. It features buck and boost behavior with variable output voltage together with high efficiency by usage of the ZETA-topology. Furthermore smart power supply functions are implemented to control and monitor output values with a graphical user interface.
This paper proposed a novel topology and control strategies for AC solid state power controllers (SSPC) in order to improve its capacity for starting large capacitive loads and enhance the security during short-circuit protection in high-power applications.
The detection of the junction temperature of power electronic devices during operation plays a central role in reliability and thermal management strategies. The on-state voltage as a TSEP (temperature sensitive electrical parameters) has advantages in terms of applicability and sensitivity to other approaches but it is influenced by the terminal connection voltage. This paper will develop a real-time...
Accurate grid synchronization unit is essential for reliable operation of grid converters. Single-phase unit may utilize measured function and its digital derivative as the base for PLL. This paper compares some solutions of accuracy problems typical for such derivative approach: oversampling of measurements, interleaved calculation of derivative and averaged evaluation pulse signals. The proposed...
This paper presents two-stage power conditioning system for grid integrated Photovoltaic (PV) applications. The proposed system has distinct feature such as: high voltage gain, high efficiency, low voltage stress and galvanic isolation. The system is controlled via Model Predictive Control (MPC) to do the following functions: extract maximum power from the PV generator, and inject a sinusoidal current...
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