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This paper presents the supercapacitor characterization for hybrid vehicle applications. This characterization takes into account frequency, voltage and temperature variations. The frequencies dependence is mainly caused by the dynamics of the ions in the electrolyte. With high frequencies, the ions do not have time to reach the surfaces not easily accessible, located deeply in the pores which causes...
This paper presents a novel direct torque control (DTC) scheme of an Interior Permanent Magnet Synchronous Motor (IPMSM) fed by a matrix converter. In the proposed scheme, a sliding mode torque and stator flux controller is integrated with a simplified Venturini's modulation algorithm to achieve low torque and flux ripples, sinusoidal input/output currents and unity fundamental displacement factor...
In this paper, an automatic frequency shifting technique is developed for achieving output voltage regulation of LLC series resonant converter (LLC-SRC). Furthermore, the operating modes and dc characteristics are discussed for designing the steady state operating point. Finally, an LLC-SRC, rated about 90 W with operating frequency range from 92 KHz to 102 KHz is provided to verify the control strategy...
The principle of photovoltaic grid-connected generation system is analyzed, and the research on PWM control strategy is done based on the power output side of photovoltaic grid-connected generation system. The direct current control strategy of photovoltaic grid-connected inverter is presented. The control fashion of applying fixed switch frequency and the feedforward compensation control of utility...
This paper presents an improved method of voltage utility factor from 50% to 86.6% for a five-leg inverter when two induction motors are driven in vector control and in a condition that a frequency of two motors isn't extremely different, and the improved method of voltage utility factor is theoretically shown. The five-leg inverter is a single inverter that can drive two motors independently and...
In this paper, a slip recovery power induction machine drive is introduced which is adaptively vector controlled in the stator flux reference frame. Using this method, the active and reactive powers injected to the stator circuits can be independently controlled so that the drive system is robust and stable against the variations of the electrical parameters and uncertainties. In the proposed control...
Power electronics has evolved to a point where building large-scale power electronics systems has become a reality. However, due to lack of standardized power electronics modules, it is difficult to reduce the costs of building power electronics systems via the system integration approach. In this paper, the input and output impedance of power electronics modules are selected as the objects for standardization...
In this paper, a four-bridge hybrid-clamped converter topology is proposed based on the analysis of existing multilevel hybrid-clamped techniques. The detailed description is given on the balancing principle of capacitors' voltages and control method of the four-bridge converter. The analysis shows that not only the cost of system is reduced quite a lot due to less active switches and capacitors used...
Paper bases on the principles of the coupling inductor to illustrate the planar integration of two resonant inductors and one filter inductor in the ZCS buck QRC, all three inductors are integrated in one magnetic core, then the decreasing in the volume and height can be achieved, through comparing the close coupling with the loose coupling, how to achieve the soft switching is discussed, and the...
In this paper there are obtained mathematical models of the saturated induction and synchronous machines. It is shown that various sets of state variables have a common theoretical background what simplifies the deduction of the saturated models. In case of salient-pole synchronous machines a basically new computational a basically new computational assumption aiming to a higher fidelity representation...
A model has been proposed for including the effects of saturation in the simulation of the three phase induction motor with delta-connected stator windings. The model combines the well known model for the machine in a rotating reference frame attached to the air-gap flux with magnetic harmonic functions, obtained experimentally, that describe the nonlinear behavior. The model also takes into account...
Based on inherent correlation between the carrier-based PWM and SVPWM for three-level inverter, this paper presents a new modulation approach for the control of the neutral-point voltage variation in the three-level neutral-point-clamped voltage source inverter. The new modulation approach realizes the control of inverter neutral-point current by modifying redundant small vectors pairs distribution...
The paper presents a switching pattern selection scheme for the control of a multilevel flying capacitor inverter. The scheme reduces capacitor voltage fluctuation without using voltage feedback. The method is developed for sinusoidal voltage generation using the selective harmonic elimination (SHE) technique and was compared favorably with the result when voltage feedback was used.. The result of...
This paper deals with a boost converter for low input voltages in battery or photovoltaic applications. The performance of a dual interleaved boost converter is investigated theoretically and experimentally. In order to increase the power density and to avoid EMI problems caused by the reverse recovery current of the diode, the discontinuous mode is considered only. At first, the steady state performance...
This paper presents a novel prototype of a current source resonant inverter using insulated gate bipolar transistors for driving a streamer reactor, streamer generation technology has been recognized as one of the best methods for water treatment, disinfection, industrial wastes utilization, and so on. However, some technological difficulties related to efficient streamer production have been significant...
This paper presents a new synchronization algorithm for grid connection of a doubly fed induction generator (DFIG) in wind generation system. A stator flux-oriented vector control is used for the variable speed DFIG operation. By controlling the generator excitation current the amplitude of the stator EMF is adjusted equal to the amplitude of the grid voltage. To set the generator frequency equal...
Wind-power generation (WPG) tends to create voltage deviation in the distribution lines because wind speed always fluctuates. This paper proposes to add a new function to the interface converter of WPG, that is, generation of reactive power to suppress the voltage deviation caused by WPG itself. This paper also proposes a reactive power control strategy for the interface converter to suppress the...
This paper investigates the function of DASM (doubly-fed asynchronous machine) with emphasis placed on its ability to the stabilization of the power system. P (active power) and Q (reactive power) compensation from DASM can be determined by fuzzy logic, and regulated independently through secondary-excitation controlling. Simulation results by EMTP show that such system can restore the power system...
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