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RISS 인기검색어
- 검색키워드
- 저자 : Heikki Tuusa (검색결과 3 건)
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Panu Lauttamus,Heikki Tuusa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper examines the reactive power and harmonics compensation performance of a low switching frequency three-level voltage-source inverter based 10 MVA STATCOM. The intention is to mitigate supply current harmonics up to the 13th order using a switching frequency between 600-1200 ㎐. However, due to the low switching frequency the STATCOM response time is not adequate for harmonics compensation because PWM modulation adds a notable delay to the current control loop. Four different harmonic detection methods equipped with control delay compensation feature are examined to improve the STATCOM performance. The STATCOM operation is studied by means of Simulink/Simplorer simulations in steady-state load conditions, during step load changes and in electric arc furnace compensation. The results show that the STATCOM performance can be extended to harmonics mitigation under steady-state load conditions. Under non-periodic load conditions the accuracy of harmonic detection and delay compensation decreases and reduces the STATCOM performance.
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Jarno Alahuhtala,Heikki Tuusa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a space vector modulation (SVM) method for four-wire Vienna rectifier (VIENNA4). The modulator uses complex plane for modulation and treats the zero-sequence voltage reference as an offset which is realized by proper weighting of redundant vectors. The main application for VIENNA4 is a transformerless ac-dc-ac converter used in uninterruptible power supplies (UPS). The applied modulation method and the control system are analyzed in detail. The analysis is verified with measurements from 10 ㎸A 230 V/400 V 50 ㎐ laboratory prototype in steady state and dynamical load conditions. The digital implementation of the modulator and the control system are realized with Freescale MPC563 microcontroller.
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Multiloop Control Strategy for Four-Wire Current Source Active Power Filter
Sami Pettersson,Mika Salo,Heikki Tuusa 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Despite the fact that three-wire active power filters have been implemented using both voltage source and current source technology, the research of four-wire current source active power filters has been truly minimal. Only a few topologies have been presented over the years. This paper proposes a four-wire current source active power filter topology for improving the quality of supply in four-wire systems. The proposed topology is controlled using a multiloop control strategy suitable for a single-chip microcontroller implementation. The control strategy combines the load current feedforward connection and the cascaded closed-loop control of the supply currents and the capacitor voltages of the LC-type supply filter. By using the cascaded closed-loop control, the stability of the system can be achieved without the need to overdimension the supply filter. The performance of the proposed system is verified experimentally using a microcontroller controlled four-wire current source active power filter prototype rated for a 5 ㎸A load.
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