Joachim Böcker

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We present a new concept for online multiobjective optimization which has been applied to a real–world application, that is the optimization of the assignment of an operating point to a doubly fed linear motor. This problem leads to a time–dependent multiobjective optimization problem. In contrast to classical optimization where the aim is to find the(More)
—The switching frequency of an inverter under direct torque control is mainly decided by the flux-and torque-controller output switching counts. It is known that, with fixed hysteresis bands, the switching frequency varies as the operating point changes. It is possible, however, to keep the switching frequency constant by the adaptation of hysteresis bands.(More)
—This paper presents a parallel combination of a shunt-connected passive filter and a distribution static compensator (DSTATCOM) for a 12-pulse thyristor rectifier feeding a high-current variable-voltage electrolyzer load. Since the process requires variation of voltage and current over a wide range, the reactive power consumed by the thyristor rectifier(More)
—A hybrid energy storage system is an energy storage consisting of more than one type of energy storages combining their advantages. The system treated in this paper consists of NiMH batteries and double layer capacitors. The power flow needs to be split up between the storage devices. This defines a multi-objective optimization with the minimization of(More)
— In this contribution, we present a novel optimal control method for mechatronic systems and apply it to compute optimal current profiles for a switched reluctance drive. The optimal current profiles are embedded into a control architecture which is validated in simulations and experiments at a real prototype. The results outperform state of the art(More)
— Subject of this contribution is a novel PWM controlled inverter of the kW power range, feeding a multi-mass ultrasonic motor (MM-USM) via a LLCC-type filter. The system is designed in a way to reduce the total harmonic distortion of the motor voltage and to locally compensate for the reactive power of the motor. Operating a three-level inverter with PWM(More)