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This paper deals with modeling and control strategy for a dual active bridge (DAB) converter. The generalized average modeling method is used to obtain the state-space representation of the DAB, in which the DC and the fundamental harmonic in the Fourier series expansion of state variables are considered. Transfer functions from control-to-output are determined, which will be used to define two controllers...
A self-sensing method for switched reluctance motors (SRM) for low speed and stand-still is introduced in this paper. The approach utilizes current slopes excited by voltage pulses that are injected into idle phases. To obtain an undisturbed signal for rotor position estimation, a simple integration of the bit-stream output of the delta-sigma modulators in the current measurement path is applied....
In this paper, the effects of time delays from ΔΣ-ADCs, used for current measurement, on Finite Control Set Model Predictive Control (FCS-MPC) is investigated. For this goal, two FCS-MPC controllers with 50 kHz and 100 kHz sampling rate and one step prediction horizon, were developed and implemented in real time on FPGA in order to control the electrical torque of an Induction Machine (IM). With the...
Modular Multilevel Converters (MMC) are a common VSC topology for high power applications like HVDC. Different modulation techniques are being used with this converter topology. Low excitation of harmonics is considered an important advantage of multilevel VSCs, but the generation of a high frequency spectrum above 2 kHz due to the high number of switching devices has not yet been sufficiently investigated...
In this paper a comparison between grid-feeding and grid-supporting inverters is shown based on simulation and measurement of inverter output impedances. The output impedance of a grid-feeding inverter with current control shows capacitive behavior compared to inductive behavior of a grid-supporting inverter with voltage control.
In this article issues related to mathematical modelling of a three-phase common mode choke (CMC) are presented. Influence of the CMC characteristics on the electromagnetic interference (EMI) filter insertion losses is investigated. A novel behavioural model of a three-phase CMC including saturation and non-linear permeability effects in the frequency domain is proposed. Those two phenomena are considered...
Finite element method (FEM) based electromagnetic simulation is commonly used for low frequency problems such as motor and transformer design. But it is rarely used for electromagnetic interference (EMI) filters design and analysis. FEM based EMI filters simulation has a number of clear advantages in comparison with conventional approaches. It takes into account mutual couplings and self-parasitics,...
Reversible and amplitude permeability along with their respective measurement techniques are introduced. They are then used to estimate the current specters resulting from voltage specters applied to cores of power inductors with an AC amplitude high enough to result in saturation. The frequency domain calculation is verified by measurement and it is concluded that when using amplitude permeability...
For utility-scale photovoltaic (PV) power plants, the trend goes towards larger installations with reduced levelized costs of electricity. Further cost reductions can be achieved by modular and redundant inverter topologies, which enable higher reliabilities and a better overall system availability. In this paper, a comparative evaluation of selected three-phase single-and multi-stage voltage source...
Solar energy is under push to reach “grid parity” without additional subsidies and favorable policies. While cost and reliability are major concerns for both photovoltaic (PV) panels and PV inverters, comparable or exceeded grid functions and power quality can further help solar power become competitive to conventional generation technologies in the wholesale electricity market. This paper gives an...
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