EPE Association: EPE 2015 - LS2f: Standards and Advanced Control Techniques for Power Converters

EPE 2015 - LS2f: Standards and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS2f: Standards and Advanced Control Techniques for Power Converters

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   A digital control algorithm for modular multilevel converters
By Nikola STANKOVIC [View]
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Abstract: We present a method for designing a stabilizing reference circulating current for modular multilevel converters. To this end, an optimization problem is formulated. This optimization problem takes into account conflicting control requirements such as reducing the oscillating component of the circulating current as well as the oscillating component of the arm voltages. Tracking of the obtained reference signal is ensured by a robust controller with gains chosen in order to attenuate the measurement noise. The control synthesis is carried out in the discrete-time domain. Such an approach yields simpler real-time implementation of the control algorithm. Performances of the proposed method are verified on a grid-connected prototype of modular multilevel converter.

   Increasing the efficiency of the Modular Multilevel Converter with MOSFET switches using Lagrange multipliers
By Andrey DUDIN [View]
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Abstract: This work proposes an approach to minimize the power losses of the Modular Multilevel Converter with MOSFET switches by applying a circulating current reference calculated using Lagrange multipliers. The optimized circulating current changes the loss distribution between the converter elements and improves the total converter efficiency. For the considered 25kW converter designs, an efficiency increase of 0.3 to 0.6 per cent was achieved which corresponds to the loss reduction of 6 to 11 per cent.

   Model Predictive Control of a STATCOM based on a Modular Multilevel Converter in Delta Configuration
By Tobias GEYER [View]
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Abstract: This paper proposes a model predictive control (MPC) scheme for the single delta bridge cell (SDBC) modular multilevel converter when operated as a static synchronous compensator (Statcom). The controller achieves reactive power compensation and current harmonic elimination while maintaining the branch currents and capacitor voltages within their safe operating limits. The MPC scheme manipulates the setpoints of a subsequent pulse width modulator. The controller is conceptually simple with an easy to devise objective function, a linearized converter model based on first principles, and constraints on the main physical quantities. The underlying optimization problem is a quadratic program, which can be solved efficiently using off-the-shelf solvers. The developed control framework achieves a good performance at steady-state operation and very fast current response during load transients.

EPE 2015 - LS2f: Standards and Advanced Control Techniques for Power Converters
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 03: Measurement and Control > EPE 2015 - LS2f: Standards and Advanced Control Techniques for Power Converters
	[return to parent folder]

	A digital control algorithm for modular multilevel converters By Nikola STANKOVIC	[View] [Download]
Abstract: We present a method for designing a stabilizing reference circulating current for modular multilevel converters. To this end, an optimization problem is formulated. This optimization problem takes into account conflicting control requirements such as reducing the oscillating component of the circulating current as well as the oscillating component of the arm voltages. Tracking of the obtained reference signal is ensured by a robust controller with gains chosen in order to attenuate the measurement noise. The control synthesis is carried out in the discrete-time domain. Such an approach yields simpler real-time implementation of the control algorithm. Performances of the proposed method are verified on a grid-connected prototype of modular multilevel converter.

	Increasing the efficiency of the Modular Multilevel Converter with MOSFET switches using Lagrange multipliers By Andrey DUDIN	[View] [Download]
Abstract: This work proposes an approach to minimize the power losses of the Modular Multilevel Converter with MOSFET switches by applying a circulating current reference calculated using Lagrange multipliers. The optimized circulating current changes the loss distribution between the converter elements and improves the total converter efficiency. For the considered 25kW converter designs, an efficiency increase of 0.3 to 0.6 per cent was achieved which corresponds to the loss reduction of 6 to 11 per cent.

	Model Predictive Control of a STATCOM based on a Modular Multilevel Converter in Delta Configuration By Tobias GEYER	[View] [Download]
Abstract: This paper proposes a model predictive control (MPC) scheme for the single delta bridge cell (SDBC) modular multilevel converter when operated as a static synchronous compensator (Statcom). The controller achieves reactive power compensation and current harmonic elimination while maintaining the branch currents and capacitor voltages within their safe operating limits. The MPC scheme manipulates the setpoints of a subsequent pulse width modulator. The controller is conceptually simple with an easy to devise objective function, a linearized converter model based on first principles, and constraints on the main physical quantities. The underlying optimization problem is a quadratic program, which can be solved efficiently using off-the-shelf solvers. The developed control framework achieves a good performance at steady-state operation and very fast current response during load transients.