EPE Association: EPE 2017 - LS1a: HVDC and FACTS

EPE 2017 - LS1a: HVDC and FACTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 06: Grids and Smart Grids > EPE 2017 - LS1a: HVDC and FACTS

   [return to parent folder]

   Control of Experimental HVDC VSCs in the Vector Space
By Ewan FARR [View]
[Download]

Abstract: This paper investigates the dynamic extension of the controllability range of Modular Multilevel Converters for High Voltage Direct Current applications by a injecting minimum zero-sequence voltage. The performance of the claimed features is supported by experimental results obtained from a Small-Scale Prototype for steady-state and under AC side voltage disturbances.

   Design Optimization of an MMC Based HVDC Current Flow Controller
By Viktor HOFMANN [View]
[Download]

Abstract: The modular multilevel converter (MMC) provides a lot of features such as low harmonic voltage content, a high power quality or easy scalability. Due to its several advantages, it is a well-suited topology for high-voltage direct current (HVDC) applications. In a meshed DC grid, a current flow control is essential. In this paper, an MMC based HVDC current flow controller is described which allows an exchange of direct power between two or more lines and can be directly installed at a DC node without any additional AC grid. Furthermore, a dimensioning method is presented for ideal scalable semiconductors as well as a design optimization based on the simplex algorithm. With this approach, additional degrees of freedom are obtained and it is possible to realize a holistic dimensioning of a given circuit.

   Frequency domain methods for stability assessment of grid-connected converters - An overview
By Georgios STAMATIOU [View]
[Download]

Abstract: Power electronic converters are today an essential part of the electrical power systems, employed to improve the system performance and enhance its stability. At the same time, the introduction of power converters might negatively affect the overall dynamic behaviour of the power system. System stability can be investigated from different perspectives, e.g. time-domain observation, eigenvalue analysis, or frequency-domain analysis. The aim of this paper is to provide an in-depth overview on two of the most popular frequency-domain methods for stability assessment of systems comprising grid-connected converters: the passivity approach and the net-damping criterion. The importance of proper system modelling is highlighted while advantages and pitfalls of the two methods are investigated. The considered frequency-domain methods are applied to a two-terminal high voltage direct current (HVDC) system, to investigate its stability both from the ac and dc side.

   Steady-state Control Strategy of Multi-terminal Hybrid UHVDC
By YING HUANG [View]
[Download]

Abstract: A multi-terminal hybrid UHVDC is planned by China Southern Power Grid. The UHVDC systerm consisits of one LCC-based sending end and two VSC-based receiving ends, rated at ±800kV. In this paper, steady-state control strategy is designed to coordinate LCC and VSCs at both sides. Smooth start-up, shutdown and reduced DC voltage operation are acheived.

EPE 2017 - LS1a: HVDC and FACTS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2017 ECCE Europe - Conference > EPE 2017 - Topic 06: Grids and Smart Grids > EPE 2017 - LS1a: HVDC and FACTS
	[return to parent folder]

	Control of Experimental HVDC VSCs in the Vector Space By Ewan FARR	[View] [Download]
Abstract: This paper investigates the dynamic extension of the controllability range of Modular Multilevel Converters for High Voltage Direct Current applications by a injecting minimum zero-sequence voltage. The performance of the claimed features is supported by experimental results obtained from a Small-Scale Prototype for steady-state and under AC side voltage disturbances.

	Design Optimization of an MMC Based HVDC Current Flow Controller By Viktor HOFMANN	[View] [Download]
Abstract: The modular multilevel converter (MMC) provides a lot of features such as low harmonic voltage content, a high power quality or easy scalability. Due to its several advantages, it is a well-suited topology for high-voltage direct current (HVDC) applications. In a meshed DC grid, a current flow control is essential. In this paper, an MMC based HVDC current flow controller is described which allows an exchange of direct power between two or more lines and can be directly installed at a DC node without any additional AC grid. Furthermore, a dimensioning method is presented for ideal scalable semiconductors as well as a design optimization based on the simplex algorithm. With this approach, additional degrees of freedom are obtained and it is possible to realize a holistic dimensioning of a given circuit.

	Frequency domain methods for stability assessment of grid-connected converters - An overview By Georgios STAMATIOU	[View] [Download]
Abstract: Power electronic converters are today an essential part of the electrical power systems, employed to improve the system performance and enhance its stability. At the same time, the introduction of power converters might negatively affect the overall dynamic behaviour of the power system. System stability can be investigated from different perspectives, e.g. time-domain observation, eigenvalue analysis, or frequency-domain analysis. The aim of this paper is to provide an in-depth overview on two of the most popular frequency-domain methods for stability assessment of systems comprising grid-connected converters: the passivity approach and the net-damping criterion. The importance of proper system modelling is highlighted while advantages and pitfalls of the two methods are investigated. The considered frequency-domain methods are applied to a two-terminal high voltage direct current (HVDC) system, to investigate its stability both from the ac and dc side.

	Steady-state Control Strategy of Multi-terminal Hybrid UHVDC By YING HUANG	[View] [Download]
Abstract: A multi-terminal hybrid UHVDC is planned by China Southern Power Grid. The UHVDC systerm consisits of one LCC-based sending end and two VSC-based receiving ends, rated at ±800kV. In this paper, steady-state control strategy is designed to coordinate LCC and VSCs at both sides. Smooth start-up, shutdown and reduced DC voltage operation are acheived.