EPE Association: EPE 2013 - LS8c: High Power Multi-Level Converters

EPE 2013 - LS8c: High Power Multi-Level Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 05: Hard switching converters and control > EPE 2013 - LS8c: High Power Multi-Level Converters

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   Balancing Control Actions for Cascaded H-Bridge Converters with Integrated Battery Energy Storage
By Michail VASILADIOTIS, Alfred RUFER [View]
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Abstract: This paper investigates the ways to handle active power components for control and balancing purposes in three-phase Cascaded H-Bridge converters with embedded battery energy storage systems. The split storage elements are interfaced to the converter modules through a non-isolated DC/DC stage, in order to eliminate the inherent second-order harmonic of the module output current. Both the cases of star and delta converter configurations are analyzed. The topology-specific degrees of freedom are exploited, control algorithms are developed and limitations are established. Potential grid asymmetries are taken into consideration through the utilization of symmetrical components. Several modes of operation are studied, such as independent load feeding, State of Charge balancing as well as converter operation under grid faults.

   Control for the currents balancing of a Multicell Interleaved Converter with ICT
By Cyrille GAUTIER, Fabien ADAM, Eric LABOURE, Bertrand REVOL, Denis LABROUSSE [View]
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Abstract: Toward the aim of advanced integration in power electronic, the properties of Multicell interleaved con-verters are of prime interest. Among these properties, the EMC behavior is interesting and the dynamicperformances are excellent. However their implementation requires the monitoring and balancing ofintercell currents. On one hand, the converter control must ensure a satisfying balanced distribution ofcurrents among switching cells outputs, so that magnetic components are used optimally. On the otherhand, this control must also ensure the regulation loop of the output current. To achieve these goals, wedecided to work on a direct matrix model, which allows to highlight the fast eigenmode related to thepower (common mode) and the slow magnetizing eigenmodes (differential modes). The synthesis of thecontrol and the calculus of corrector parameters are performed using inversion of this direct model. Adigital control based on this method has been implemented, and the measurement results that we present confirm it’s efficiency on current balancing.

   DC-link voltage balancing method for a hybrid asymmetric multilevel converter
By Marcin ZYGMANOWSKI, Jaroslaw MICHALAK, Boguslaw GRZESIK [View]
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Abstract: The paper presents the dc-link voltage balancing method for a five-level hybrid asymmetric multilevel converter based on a neutral point clamped (NPC) converter with H-bridge (HB) converters. The considered converter, which is referred to as NPC-HB, is treated in this paper as a modification of the classic three-level NPC converter. It improves the harmonic performance of output voltage compared to the NPC converter. This improvement is made by increasing the number of levels in the converter output voltage. Nevertheless, due to the use of floating H-bridge converters inside the NPC-HB topology, the dc voltage balancing method is implemented. Basing on the converter ac side current and HB converter dc link voltage, the proposed method modifies the PWM modulation scheme in both NPC and HB converters. This modification is applied to each switching period while the converter output voltage reference is kept unchanged. Such modulation scheme is characterized as robust and guaranteeing the low harmonic content in the output voltage. Other dc voltage balancing methods of the hybrid NPC-HB converter are compared in this paper. The proposed method is experimentally verified.

EPE 2013 - LS8c: High Power Multi-Level Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 05: Hard switching converters and control > EPE 2013 - LS8c: High Power Multi-Level Converters
	[return to parent folder]

	Balancing Control Actions for Cascaded H-Bridge Converters with Integrated Battery Energy Storage By Michail VASILADIOTIS, Alfred RUFER	[View] [Download]
Abstract: This paper investigates the ways to handle active power components for control and balancing purposes in three-phase Cascaded H-Bridge converters with embedded battery energy storage systems. The split storage elements are interfaced to the converter modules through a non-isolated DC/DC stage, in order to eliminate the inherent second-order harmonic of the module output current. Both the cases of star and delta converter configurations are analyzed. The topology-specific degrees of freedom are exploited, control algorithms are developed and limitations are established. Potential grid asymmetries are taken into consideration through the utilization of symmetrical components. Several modes of operation are studied, such as independent load feeding, State of Charge balancing as well as converter operation under grid faults.

	Control for the currents balancing of a Multicell Interleaved Converter with ICT By Cyrille GAUTIER, Fabien ADAM, Eric LABOURE, Bertrand REVOL, Denis LABROUSSE	[View] [Download]
Abstract: Toward the aim of advanced integration in power electronic, the properties of Multicell interleaved con-verters are of prime interest. Among these properties, the EMC behavior is interesting and the dynamicperformances are excellent. However their implementation requires the monitoring and balancing ofintercell currents. On one hand, the converter control must ensure a satisfying balanced distribution ofcurrents among switching cells outputs, so that magnetic components are used optimally. On the otherhand, this control must also ensure the regulation loop of the output current. To achieve these goals, wedecided to work on a direct matrix model, which allows to highlight the fast eigenmode related to thepower (common mode) and the slow magnetizing eigenmodes (differential modes). The synthesis of thecontrol and the calculus of corrector parameters are performed using inversion of this direct model. Adigital control based on this method has been implemented, and the measurement results that we present confirm it’s efficiency on current balancing.

	DC-link voltage balancing method for a hybrid asymmetric multilevel converter By Marcin ZYGMANOWSKI, Jaroslaw MICHALAK, Boguslaw GRZESIK	[View] [Download]
Abstract: The paper presents the dc-link voltage balancing method for a five-level hybrid asymmetric multilevel converter based on a neutral point clamped (NPC) converter with H-bridge (HB) converters. The considered converter, which is referred to as NPC-HB, is treated in this paper as a modification of the classic three-level NPC converter. It improves the harmonic performance of output voltage compared to the NPC converter. This improvement is made by increasing the number of levels in the converter output voltage. Nevertheless, due to the use of floating H-bridge converters inside the NPC-HB topology, the dc voltage balancing method is implemented. Basing on the converter ac side current and HB converter dc link voltage, the proposed method modifies the PWM modulation scheme in both NPC and HB converters. This modification is applied to each switching period while the converter output voltage reference is kept unchanged. Such modulation scheme is characterized as robust and guaranteeing the low harmonic content in the output voltage. Other dc voltage balancing methods of the hybrid NPC-HB converter are compared in this paper. The proposed method is experimentally verified.