EPE Association: EPE 2011 - LS5e: Topic 05: Emerging Topologies

EPE 2011 - LS5e: Topic 05: Emerging Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS5e: Topic 05: Emerging Topologies

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   Dynamic Capacitor – VAR and Harmonic Compensation without Inverters
By Anish PRASAI, Deepak DIVAN [View]
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Abstract: Dynamic Capacitor (D-CAP) is able to provide both dynamic VAR injection and active harmonic filtering in one single integrated unit using a direct AC converter topology interfaced with a power factor correction or a VAR capacitor. Previous papers have shown the effectiveness, higher reliability and lower cost of the D-CAP when compared with commercial inverter-based solutions. However, these papers have focused primarily on the buck D-CAP. This paper will extend the discussions to the boost- and buck-boost topologies as well. Analytical and numerical expressions are derived for these three topologies, and comparisons are made in terms of performance and component ratings.

   P+Resonant Control of a Z-Source Inverter for Mains Voltage Drop Compensation
By Moritz VON ZIMMERMANN, Sven Ludwig KELLNER, Bernhard PIEPENBREIER [View]
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Abstract: Z-Source inverters, consisting of both inductors and capacitors as DC-link components, provide unique boost capability in contrast to conventional inverters. The simple structure needs no additional switching elements and only small step-up chokes. Due to the oscillatory arrangement of both inductors and capacitors in the DC-link, voltages and currents exhibit a characteristical six-pulse ripple when using the Z-source inverter with an AC supply. The consequences are distortion of the output voltage and self-boosting due to unwanted shoot-through states and oscillating DC-link voltage due to mains voltage rectifying. An active rectifier topology in combination with a damped mains filter is proposed to prevent any unwanted shoot-through states. Besides, regenerating operation of the Z-source inverter with AC supply is enabled. Resting on this new structure with minimized passive components, a state space description is given. Subsequently, a simple and robust P+resonant closed loop control is designed to avoid load current harmonics caused by mains voltage rectifying. For each frequency component of the sixpulse ripple, a separate controller is employed. The phase-shift of the Z-source network is compensated by additional all-pass filters. Experimental results verify the suitability.

   Preliminary hardware implementation of a six-phase quad-inverter induction motor drive
By Gabriele GRANDI, Padmanaban SANJEEVIKUMAR, Domenico CASADEI [View]
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Abstract: A hardware implementation of a quad-inverter configuration for multi-phase multi-level induction motor drives is presented in this paper. The scheme is based on four conventional 2-level three-phase voltage source inverters, able to supply the open-end windings of a dual three-phase motor (asymmet¬ric six-phase machine), quadrupling the power capability of a single VSI with given voltage and cur¬rent ratings. By a proper control algorithm the proposed converter is able to generate multi-level volt¬age waveforms, equivalent to the ones of a 3-level inverter, and to share the total motor power among the four dc sources within each switching period. A full-scale prototype of the whole power system has been realized utilizing six balanced impedances as six-phase load. A complete set of experimental results is given with reference to both balanced and unbalanced operating conditions.

EPE 2011 - LS5e: Topic 05: Emerging Topologies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 05: Hard Switching Inverters and Control > EPE 2011 - LS5e: Topic 05: Emerging Topologies
	[return to parent folder]

	Dynamic Capacitor – VAR and Harmonic Compensation without Inverters By Anish PRASAI, Deepak DIVAN	[View] [Download]
Abstract: Dynamic Capacitor (D-CAP) is able to provide both dynamic VAR injection and active harmonic filtering in one single integrated unit using a direct AC converter topology interfaced with a power factor correction or a VAR capacitor. Previous papers have shown the effectiveness, higher reliability and lower cost of the D-CAP when compared with commercial inverter-based solutions. However, these papers have focused primarily on the buck D-CAP. This paper will extend the discussions to the boost- and buck-boost topologies as well. Analytical and numerical expressions are derived for these three topologies, and comparisons are made in terms of performance and component ratings.

	P+Resonant Control of a Z-Source Inverter for Mains Voltage Drop Compensation By Moritz VON ZIMMERMANN, Sven Ludwig KELLNER, Bernhard PIEPENBREIER	[View] [Download]
Abstract: Z-Source inverters, consisting of both inductors and capacitors as DC-link components, provide unique boost capability in contrast to conventional inverters. The simple structure needs no additional switching elements and only small step-up chokes. Due to the oscillatory arrangement of both inductors and capacitors in the DC-link, voltages and currents exhibit a characteristical six-pulse ripple when using the Z-source inverter with an AC supply. The consequences are distortion of the output voltage and self-boosting due to unwanted shoot-through states and oscillating DC-link voltage due to mains voltage rectifying. An active rectifier topology in combination with a damped mains filter is proposed to prevent any unwanted shoot-through states. Besides, regenerating operation of the Z-source inverter with AC supply is enabled. Resting on this new structure with minimized passive components, a state space description is given. Subsequently, a simple and robust P+resonant closed loop control is designed to avoid load current harmonics caused by mains voltage rectifying. For each frequency component of the sixpulse ripple, a separate controller is employed. The phase-shift of the Z-source network is compensated by additional all-pass filters. Experimental results verify the suitability.

	Preliminary hardware implementation of a six-phase quad-inverter induction motor drive By Gabriele GRANDI, Padmanaban SANJEEVIKUMAR, Domenico CASADEI	[View] [Download]
Abstract: A hardware implementation of a quad-inverter configuration for multi-phase multi-level induction motor drives is presented in this paper. The scheme is based on four conventional 2-level three-phase voltage source inverters, able to supply the open-end windings of a dual three-phase motor (asymmet¬ric six-phase machine), quadrupling the power capability of a single VSI with given voltage and cur¬rent ratings. By a proper control algorithm the proposed converter is able to generate multi-level volt¬age waveforms, equivalent to the ones of a 3-level inverter, and to share the total motor power among the four dc sources within each switching period. A full-scale prototype of the whole power system has been realized utilizing six balanced impedances as six-phase load. A complete set of experimental results is given with reference to both balanced and unbalanced operating conditions.