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Model Predictive Control (MPC) method offers advantages of easy implementation and fast dynamics. However Model predictive control method has variable switching frequency, which makes design of the output filter difficult for power converter. Despite the problems of MPC algorithm, there are little methods to fix the switching frequency using MPC algorithm in power converter. Therefore, this paper...
Gallium nitride (GaN) switches have superior switching performance when compared to the traditional Si technology. Therefore, GaN switches are an appealing option for power converters and electrical drives. In this paper, considerations for a high-speed electrical drive with inverter switching frequency of 1 MHz are presented, along with simulation results of the motor control of the drive.
The application of Gallium Nitride (GaN) power transistors in a single phase inverter for photovoltaic (PV) systems is presented inverter. The power of the system is 2 kW. For both stages (DC boost stage and inverter stage), a very high switching frequency of 250 kHz is used. By this, a highly compact design for the inverter (200 × 150 × 80 mm3 / 2.4 l) was reached. The power to weight ratio corresponds...
The need for efficient, smaller, lighter and cheaper power supply units drive the investigation of using high switching frequency soft switching resonant converters. This work presents an 88% efficient 48V nominal input converter switching at 6 MHz and output power of 21 Watts achieving power density of 7 W/cm3 for Power-over-Ethernet LED lighting applications. The switching frequency is used to control...
Recently, the demand of the position sensorless control is increasing in motor drive. At low speed range, the saliency-based methods are proposed. In this paper, using the modified symmetrical carrier PWM with switching frequencies up to 16kHz, we achieve to reduce the audible noise that human can be heard.
A circuit topology and its control for a bi-directional isolated series resonant converter (SRC) are proposed. In general SRCs, when the output voltage is decreased, the turn-off current and the switching frequency are increased and efficiency is decreased due to the increase of switching loss. MOSFETs are therefore mainly used, as MOSFETs have a lower turn-off loss than IGBTs. In the present study,...
This paper presents an adaptive slope compensation method for peak current mode control of digital controlled DC-DC converters, which controls the quality factor of the complex conjugated poles at half the switching frequency. Using quality factor control enables optimization of the dynamic performance and stability of current mode control. The presented method adapt to DC-DC converter operating conditions...
In this paper, DC-DC power converter based on Galium Nitride Gate Injection Transistors (GaN GIT) is presented. The use of such power devices allows to increase of switching frequency and to reach high efficiency. Efficiency measurements of power conversion were carried out for two switching frequencies (100 kHz, 200 kHz, 400 kHz).
An electric motor is more effective and flexible when supplied by a frequency converter. The frequency converter not only produces the fundamental voltage but also a set of higher harmonics which cause additional losses in the motor. Losses in the frequency converter are normally neglected in the drive dimensioning due to insufficient data available from manufacturers. Motor's losses can be reduced...
This work investigates the possibility to reduce the thermal stressing of high power IGBT modules in a DC-current application. Using four load current profiles as examples, two mitigation strategies are presented and their benefit to the power stack in terms of lifetime prolongation is evaluated. In the final part of the work, the investigation focuses on the relation between the shape of the load...
Silicon carbide semiconductors offer high switching frequencies for high voltage application which reduces the filter size. The main drawback of high current applications are high turn-on losses. Within this paper an inverter is proposed which uses a quasi-resonant triangular current mode where the MOSFETs are turned on at zero current.
The presented DTC-3V-3L method was designed to ensure the high performance of PMSM drive. Using the predictive approach the algorithm minimizes torque ripples, ensures constant switching frequency and DC link voltage balancing. Moreover, it also provides the fastest dynamic torque response, similar to the fastest non-linear methods.
This paper presents a new modulation concept for three-to-single-phase direct AC/AC modular multi-level converter-based railway interties. The concept minimizes the inherent harmonic coupling between the two grid sides and is therefore particularly suited to operation at very low cell numbers and switching frequencies. Moreover, it facilitates the use of specific modulation methods, such as optimized...
A Multilevel Cascaded H-Bridge (MLCHB) converter was designed and implemented for the application of an Ironless Axial Flux Permanent Magnet (IAFPM) motor drive. This paper provides an analysis of the IAFPM motor and the performance of the converter's ripple current regulation capabilities. Lastly a comparison between the simulation and the experimental results is presented.
The interaction of power electronic converters in a microgrid can introduce system instability and power quality issues. Existing investigations focus on interactions either in low frequency regions, such as the constant power load, or in very high frequency regions like electro-magnetic interference. However, interactions of power converters around their switching frequency range are not included...
An investigation of the voltage imbalance of the two capacitors of the semi-full-bridge submodule is performed. Since the capacitances are not exactly the same, there may be a difference between the capacitor voltages. The resulting current-spike when they are connected in parallel has been analyzed in a full-scale laboratory experiment.
A control algorithm for an integrated power factor correction (PFC) and series resonant converter (SRC) using only two switches is presented, allowing to open loop control the AC input current and the DC output current independently. The theory for this approach is analyzed in time domain and a novel approach for open loop regulation is presented and verified. The software defined power (SDF) control...
In this paper a control scheme for a PMSM drive that keeps the torque ripple within predefined limits is presented. The electromagnetic torque is assumed to be proportional to i1q, which is measured by using Sigma-Delta Analog to Digital Converters (ΣΔ-ADCs) with a very high sampling rate, so the actual ripple of the torque can be obtained and controlled in an enhanced way. The measurement results...
With an increase in the wind turbine ratings, power converter ratings increase as well, thus raising the interest in medium voltage power converters. Switching frequency in said converters has to be kept below 1 kHz; hence the sampling frequency, which normally nowadays equals twice the switching frequency, is low as well. Sampling at low rates introduces additional non-idealities in the control of...
This paper presents designing procedure of a high efficiency 5 kW silicon-carbide (SiC) based three-phase power factor correction (PFC). SiC switches present low capacitive switching loss compared to the alternative Si switches. Therefore, the switching frequency can be increased and hence the size of the line filter (generally reactive components) will be reduced. However, to achieve high efficiency...
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