Search results for: Roland Seebacher
article
IEEE Transactions on Industry Applications > 2017 > 53 > 6 > 5415 - 5425
Open-switch faults in inverter-driven electric drives have recently gained increasing attention in the scientific community. Since these faults may lead to undesired effects, their fast and unambiguous detection is desirable. This paper proposes a detection algorithm for open-switch faults, which is based on the observation of the current control deviation and a subsequent test procedure. This algorithm...
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This paper deals with the effects of rotor position measurement errors in terms of field-orientated control concepts of surface- and interior permanent magnetized synchronous machines (SPMSM/IPMSM). Most publications only consider the influences of deviated controlled currents on the machine's torque, but not the whole dynamics of electric machine and control system. This leads to relatively pessimistic...
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Single switch open circuit faults in three-phase AC-drives lead to undesired effects and potentially to a total failure of the drive. This paper proposes a post-fault operation strategy for such faults with the focus on the limitation of losses after the reconfiguration and thereby an extension of the possible range of operation. The performance of the strategy is shown both via simulations and experiments.
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Open circuit faults in inverter driven electric drives have recently gained increasing attention in the scientific community. Since these faults may lead to undesired effects, their fast and unambiguous detection is desirable. This paper proposes a detection algorithm for open circuit faults which is based on the observation of the current control deviation and a subsequent test procedure. This algorithm...
chapter
An inverter characterization technique is used to improve inverter fault diagnosis and prognosis techniques with the demonstrative bond wire lift-off fault. Knowledge of the nonlinear voltage-current characteristic of each inverter device is used to achieve these improvements. Three contributions are made in this paper to the field of inverter condition monitoring by using the characterization technique:...
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This paper introduces a detailed nonlinearity characterization technique for insulated-gate bipolar transistor inverters in a drive system which is able to measure device nonlinearities. Methods are derived from measurements of the voltage on the inverter phases. These measurements are obtained while applying a set of direct currents to an electrical machine. These methods are then applied to tests...
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Inverter dead-time distortion in output voltages have been widely investigated in the past for three-phase PWM voltage source inverters. Also, there have been some studies about multi-phase inverters with reference to multi-phase drives. Usually, almost sinusoidal output currents are considered, with a single zero crossing for every half fundamental period. High output current ripple introduces multiple...
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A method for supporting unbalanced grids by utilizing a drive system with induction machine and inverter with no or low intermittent energy storage is proposed. Even though the instantaneous power, that is drawn from the mains is oscillating, the torque and speed of the machine are maintained constant. A strategy for obtaining the time dependent reference values for the flux linkage and the torque...
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Doubly fed induction generators in conjunction with frequency converters allow the economic construction of large wind power plants with variable speed drives and a rated power output of up to several MW. Compared to fixed speed generators, the advantages of this configuration are high energy yields despite changing wind speeds, reduced negative effects on the grid and the possibility of reactive-power...
