EPE Association: NORpie 2002 - Topic 01: CONVERTERS I

NORpie 2002 - Topic 01: CONVERTERS I
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2002 > NORpie 2002 - Topic 01: CONVERTERS I

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   Analytical Power Loss Expressions for Diode Clamped Converters
By R. Lund; G. Tomta; R. Nilsen [View]
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Abstract: This paper is presenting analytical expressions for the power losses in the switching devices in 4- and 5-level diode clamped converters. By using analytical expressions, time consuming domain simulations are avoided. At last a comparison of the switching and conduction losses between 2-, 3-, 4-, and 5-level diode is done.

   Novel Soft-Switching Isolated Three-Phase Bidirectional AC/DC Converter
By S. Norrga [View]
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Abstract: A novel ac/dc converter topology comprises a voltage source converter with capacitive snubbers and a 3-by-2 cycloconverter, connected by an MF tranbsformer. By alternately commutating the two converters it is possible to achieve soft switching conditions for all of the semiconductor elements. Furthermore, it is shown that resonant commutation of the voltage source converter is possible by utilizing the cycloconverter for short-circuiting the transformer terminals.

   Comparison of Modulation Methods for Matrix Converters
By M. Jussila; M. Salo; H. Tuusa [View]
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Abstract: This paper compares different modulation methods suitable for matrix converter. A matrix converter is a direct frequency converter for which both vector modulation and triangular wave voltage command modulation methods are suitable. Three such methods were simulated with Simplorer (R): two triangular wave voltage command methods, and one vector modulation method. The first method produces input currents with six-step waveforms. The other method produces sinusoidal input current waveforms. In the simulations the main circuit was ideal, and it was rated to 5 kVA RL-load for output power factor 0.8. Overmodulation was also examined in all cases. It was observed that reasonable overmodulation did not significantly increase THD% (Total Harmonic Distortion percent) for input current significantly. Thus increasing the output-input voltage ratio from the conventional 0.86 seemed to be possible.

   Calculation of AC Side Harmonic Losses in Three-Level Converters
By G. Tomta; R. Lund; R. Nilsen [View]
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Abstract: This paper presents analytical expressions for the AC side harmonic losses in 3-level converters. By using analytical expressions, time consuming time domain simulations are avoided. Verification is done by comparison to circuit simulations. At last a comparison of AC side harmonic losses in 2- and 3-level is shown.

   Experimental Results of a Voltage Source Shunt Active Power Filter
By M. Routimo; M. Salo; H. Tuusa [View]
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Abstract: This paper presents simulation and experimental results of a three-phase voltage source shunt active power filter (APF). The performance of the system is examined with two different filter inductances and dc-link voltages. The control system is kept simple enough to make it effective to implement with a single-chip microcontroller. The dc-link voltage is controlled with a non-linear Pe2-controller, which applies effectively to the voltage control of the APF. The control system is implemented in a synchronous reference frame, where the harmonics of load current can easily extracted using high-pass filtering. The system is studied through computer simulations and measurements with a prototype of the APF.

NORpie 2002 - Topic 01: CONVERTERS I
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 2002 > NORpie 2002 - Topic 01: CONVERTERS I
	[return to parent folder]

	Analytical Power Loss Expressions for Diode Clamped Converters By R. Lund; G. Tomta; R. Nilsen	[View] [Download]
Abstract: This paper is presenting analytical expressions for the power losses in the switching devices in 4- and 5-level diode clamped converters. By using analytical expressions, time consuming domain simulations are avoided. At last a comparison of the switching and conduction losses between 2-, 3-, 4-, and 5-level diode is done.

	Novel Soft-Switching Isolated Three-Phase Bidirectional AC/DC Converter By S. Norrga	[View] [Download]
Abstract: A novel ac/dc converter topology comprises a voltage source converter with capacitive snubbers and a 3-by-2 cycloconverter, connected by an MF tranbsformer. By alternately commutating the two converters it is possible to achieve soft switching conditions for all of the semiconductor elements. Furthermore, it is shown that resonant commutation of the voltage source converter is possible by utilizing the cycloconverter for short-circuiting the transformer terminals.

	Comparison of Modulation Methods for Matrix Converters By M. Jussila; M. Salo; H. Tuusa	[View] [Download]
Abstract: This paper compares different modulation methods suitable for matrix converter. A matrix converter is a direct frequency converter for which both vector modulation and triangular wave voltage command modulation methods are suitable. Three such methods were simulated with Simplorer (R): two triangular wave voltage command methods, and one vector modulation method. The first method produces input currents with six-step waveforms. The other method produces sinusoidal input current waveforms. In the simulations the main circuit was ideal, and it was rated to 5 kVA RL-load for output power factor 0.8. Overmodulation was also examined in all cases. It was observed that reasonable overmodulation did not significantly increase THD% (Total Harmonic Distortion percent) for input current significantly. Thus increasing the output-input voltage ratio from the conventional 0.86 seemed to be possible.

	Calculation of AC Side Harmonic Losses in Three-Level Converters By G. Tomta; R. Lund; R. Nilsen	[View] [Download]
Abstract: This paper presents analytical expressions for the AC side harmonic losses in 3-level converters. By using analytical expressions, time consuming time domain simulations are avoided. Verification is done by comparison to circuit simulations. At last a comparison of AC side harmonic losses in 2- and 3-level is shown.

	Experimental Results of a Voltage Source Shunt Active Power Filter By M. Routimo; M. Salo; H. Tuusa	[View] [Download]
Abstract: This paper presents simulation and experimental results of a three-phase voltage source shunt active power filter (APF). The performance of the system is examined with two different filter inductances and dc-link voltages. The control system is kept simple enough to make it effective to implement with a single-chip microcontroller. The dc-link voltage is controlled with a non-linear Pe2-controller, which applies effectively to the voltage control of the APF. The control system is implemented in a synchronous reference frame, where the harmonics of load current can easily extracted using high-pass filtering. The system is studied through computer simulations and measurements with a prototype of the APF.