Heikki Tuusa

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In this paper, the control of the pulse width-modulated current-source-inverter-fed induction motor drive is discussed. The vector control system of the induction motor is realized in a rotor-flux-oriented reference frame, where only the measured angular rotor speed and the dc-link current are needed for motor control. A new damping method for stator(More)
Low voltage direct current (LVDC) distribution is a new low voltage distribution concept. In this study, potential line and load converter topologies for a bipolar LVDC 1500 V distribution system are compared. It is possible to supply the LVDC network by one or two line converters and the line and load converters can be connected to 750 V DC or 1500 V DC.(More)
In this paper, a new control system for the currentsource active power filter is presented. The harmonic current compensation is realized using combined feedforward control of the load currents and closed-loop control of the supply currents. The control system includes a simple method for compensating the sampling and calculation delays of the digital(More)
This paper analyzes a DFIG (doubly fed induction generator) WT (wind turbine) fault current after a symmetrical network voltage dip. The goal is to identify the factors determining how fast the first zero crossings of the fault current occur. This is an important subject because the fundamental property of the CB (circuit breaker) is that it breaks the(More)
Power losses and voltage stresses are a problem in active filters. This paper proposes a voltage-source active filter (VSAF) with an LCLC-circuit which has lower voltage stresses, smaller power losses and smaller inductors than a conventional VSAF. The method is based on the series capacitor structure used to block the fundamental supply voltage component.(More)
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