EPE Association: EPE 2003 - Topic 03d: Modern Line Side Converters

EPE 2003 - Topic 03d: Modern Line Side Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 03: POWER ELECTRONICS CONVERTER CIRCUITS > EPE 2003 - Topic 03d: Modern Line Side Converters

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   Active damping of oscillations in LC-filter for line connected, current controlled, PWM voltage source converters
By O. Mo; M. Hernes; K. Ljøkelsøy [View]
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Abstract: Presented is a method for active damping of oscillations between line reactance and filter capacitors in LC-filter for line connected current controlled pulse width modulated (PWM) voltage source converters. The idea is to include closed loop feedback control that controls the capacitor voltage oscillations to zero by adding damping components to the current references. The voltage oscillations are calculated from manipulated measured filter capacitor voltages (using phase locked loop (PLL), Park- and inverse Park-transformation, low pass filtering and summation). The advantage of such an approach is that the higher oscillation frequency components can be controlled independently of remaining converter control. It is only the higher frequency components that are controlled by this additional closed loop voltage control. Further, additional measurements and increased converter rating are not required. Simulations and measurements presented in this paper show that the method works as intended. If active damping is implemented, then the voltage quality at the point of converter connection is maintained also in cases were filter oscillations is to be expected when the LC-filter is introduced.

   A steady-state comparison of 2-switch harmonic injection and 3-switch/level (VIENNA I) boost-type three-phase rectifiers
By T. Viitanen; J. Hautamaki; H. Tuusa [View]
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Abstract: This paper describes the steady-state simulation results of two unidirectional boost-type three-phase rectifiers; the two-switch harmonic injection based rectifier and the three-switch/level VIENNA I rectifier. The principle operation of the rectifier topologies examined and control systems applied are analysed. The rectifier topologies are designed to operate at 10kW (230/400V@50Hz) rated output power so that the total harmonic line current distortion (THD) is 4%. The DC link voltage is set at 650V. The applied average switching frequency is 5kHz. Simulations are carried out with SimplorerÆÊ. The simulation models are non-ideal. The semiconductor devices are modelled on the basis of the manufacturer¡¦s datasheets in order to take the true power loss and switching transient behaviour into account. Passive component models are also modelled to be non-ideal. On the basis of the simulation results, the power losses and voltage and current ratings of the components needed in the main circuits and filters are determined. With the help of these results, the two rectifier topologies are compared.

EPE 2003 - Topic 03d: Modern Line Side Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2003 - Conference > EPE 2003 - Topic 03: POWER ELECTRONICS CONVERTER CIRCUITS > EPE 2003 - Topic 03d: Modern Line Side Converters
	[return to parent folder]

	Active damping of oscillations in LC-filter for line connected, current controlled, PWM voltage source converters By O. Mo; M. Hernes; K. Ljøkelsøy	[View] [Download]
Abstract: Presented is a method for active damping of oscillations between line reactance and filter capacitors in LC-filter for line connected current controlled pulse width modulated (PWM) voltage source converters. The idea is to include closed loop feedback control that controls the capacitor voltage oscillations to zero by adding damping components to the current references. The voltage oscillations are calculated from manipulated measured filter capacitor voltages (using phase locked loop (PLL), Park- and inverse Park-transformation, low pass filtering and summation). The advantage of such an approach is that the higher oscillation frequency components can be controlled independently of remaining converter control. It is only the higher frequency components that are controlled by this additional closed loop voltage control. Further, additional measurements and increased converter rating are not required. Simulations and measurements presented in this paper show that the method works as intended. If active damping is implemented, then the voltage quality at the point of converter connection is maintained also in cases were filter oscillations is to be expected when the LC-filter is introduced.

	A steady-state comparison of 2-switch harmonic injection and 3-switch/level (VIENNA I) boost-type three-phase rectifiers By T. Viitanen; J. Hautamaki; H. Tuusa	[View] [Download]
Abstract: This paper describes the steady-state simulation results of two unidirectional boost-type three-phase rectifiers; the two-switch harmonic injection based rectifier and the three-switch/level VIENNA I rectifier. The principle operation of the rectifier topologies examined and control systems applied are analysed. The rectifier topologies are designed to operate at 10kW (230/400V@50Hz) rated output power so that the total harmonic line current distortion (THD) is 4%. The DC link voltage is set at 650V. The applied average switching frequency is 5kHz. Simulations are carried out with SimplorerÆÊ. The simulation models are non-ideal. The semiconductor devices are modelled on the basis of the manufacturer¡¦s datasheets in order to take the true power loss and switching transient behaviour into account. Passive component models are also modelled to be non-ideal. On the basis of the simulation results, the power losses and voltage and current ratings of the components needed in the main circuits and filters are determined. With the help of these results, the two rectifier topologies are compared.