EPE Association: EPE 2014 - LS5d: Standards and Advanced Control Techniques for Power Converters (III)

EPE 2014 - LS5d: Standards and Advanced Control Techniques for Power Converters (III)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - LS5d: Standards and Advanced Control Techniques for Power Converters (III)

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   A Distributed and Fault-Tolerant Control System for a New Modular Wind Turbine Converter
By Chester DITMANSON, Stefan KOLB [View]
[Download]

Abstract: Distributed control solutions are being pursued for new modular converter topologies. In this paper, a novel distributed control system is presented for a modular wind turbine drive with 12 parallel converter modules, where each module has a local control platform and two central control units are used, one active and one redundant unit. A comparison is done of ring versus star network topologies, and it is concluded that the star topology has the advantages of lower latency, higher bandwidth, and better synchronization and the drawbacks of a complex central controller and lower scalability. Analysis is done for fault-tolerant, synchronized operation with a redundant star network topology using 100BASE-TX Ethernet for communications. Furthermore, small custom Ethernet data packets transmitted at regular intervals are used which provides benefits of ensured data integrity, low signal latency, and simple synchronization. Experimental results demonstrate ca. 20 ns synchronization precision, and interruption-free fault tolerance.

   Innovative State-Space-Controller for an optimized Low-Voltage-Ride-Through Behaviour
By Michael EBERLIN, Christoph SIEDLE, Florian REINERS [View]
[Download]

Abstract: This paper introduces a state-space controller for grid current control which has been developed to optimize the system behaviour of grid connected inverters during voltage dips and short circuits. The performed tests illustrate that in comparison to standard PID-controllers a considerable improvement of the system performance could be realized.

   State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter
By Jarno KUKKOLA, Marko HINKKANEN [View]
[Download]

Abstract: This paper proposes a simple grid-voltage sensorless alternative to the conventional PLL synchronization for a grid-connected converter equipped with an LCL filter. The grid-voltage magnitude and angle are estimated based only on the converter current and DC-voltage measurements. Reduced number of sensors decreases costs and amount of sensor wiring. The analytically derived design is validated experimentally.

   Transforming dynamic system models between two-axis reference frames rotating at different angular frequencies
By Jussi KARTTUNEN, Samuli KALLIO, Pasi PELTONIEMI, Pertti SILVENTOINEN [View]
[Download]

Abstract: This paper introduces a general method to transform dynamic system models between two-axis reference frames that are rotating at different angular frequencies. Such a transformation is needed in the analysis and implementation of a control system where the entire system is not presented in the same reference frame. Detailed derivation of the transformation for transfer function matrices is presented. Contrary to the previous solutions, the suggested transformation is not limited by the structure of the transfer function matrix of the system. Application examples illustrate the theory. Theoretical analysis indicates important design limitations especially for multiple frame control systems. Experimental results verify the analysis.

EPE 2014 - LS5d: Standards and Advanced Control Techniques for Power Converters (III)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 03: Measurement and Control > EPE 2014 - LS5d: Standards and Advanced Control Techniques for Power Converters (III)
	[return to parent folder]

	A Distributed and Fault-Tolerant Control System for a New Modular Wind Turbine Converter By Chester DITMANSON, Stefan KOLB	[View] [Download]
Abstract: Distributed control solutions are being pursued for new modular converter topologies. In this paper, a novel distributed control system is presented for a modular wind turbine drive with 12 parallel converter modules, where each module has a local control platform and two central control units are used, one active and one redundant unit. A comparison is done of ring versus star network topologies, and it is concluded that the star topology has the advantages of lower latency, higher bandwidth, and better synchronization and the drawbacks of a complex central controller and lower scalability. Analysis is done for fault-tolerant, synchronized operation with a redundant star network topology using 100BASE-TX Ethernet for communications. Furthermore, small custom Ethernet data packets transmitted at regular intervals are used which provides benefits of ensured data integrity, low signal latency, and simple synchronization. Experimental results demonstrate ca. 20 ns synchronization precision, and interruption-free fault tolerance.

	Innovative State-Space-Controller for an optimized Low-Voltage-Ride-Through Behaviour By Michael EBERLIN, Christoph SIEDLE, Florian REINERS	[View] [Download]
Abstract: This paper introduces a state-space controller for grid current control which has been developed to optimize the system behaviour of grid connected inverters during voltage dips and short circuits. The performed tests illustrate that in comparison to standard PID-controllers a considerable improvement of the system performance could be realized.

	State observer for grid-voltage sensorless control of a grid-connected converter equipped with an LCL filter By Jarno KUKKOLA, Marko HINKKANEN	[View] [Download]
Abstract: This paper proposes a simple grid-voltage sensorless alternative to the conventional PLL synchronization for a grid-connected converter equipped with an LCL filter. The grid-voltage magnitude and angle are estimated based only on the converter current and DC-voltage measurements. Reduced number of sensors decreases costs and amount of sensor wiring. The analytically derived design is validated experimentally.

	Transforming dynamic system models between two-axis reference frames rotating at different angular frequencies By Jussi KARTTUNEN, Samuli KALLIO, Pasi PELTONIEMI, Pertti SILVENTOINEN	[View] [Download]
Abstract: This paper introduces a general method to transform dynamic system models between two-axis reference frames that are rotating at different angular frequencies. Such a transformation is needed in the analysis and implementation of a control system where the entire system is not presented in the same reference frame. Detailed derivation of the transformation for transfer function matrices is presented. Contrary to the previous solutions, the suggested transformation is not limited by the structure of the transfer function matrix of the system. Application examples illustrate the theory. Theoretical analysis indicates important design limitations especially for multiple frame control systems. Experimental results verify the analysis.