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Power-Synchronization Control of Grid-Connected Voltage-Source Converters | IEEE Journals & Magazine | IEEE Xplore

Power-Synchronization Control of Grid-Connected Voltage-Source Converters


Abstract:

In this paper, a novel control method of grid-connected voltage-source converters (VSCs) is proposed. The method can be generally applied for all grid-connected VSCs but ...Show More

Abstract:

In this paper, a novel control method of grid-connected voltage-source converters (VSCs) is proposed. The method can be generally applied for all grid-connected VSCs but may be of most importance in high-voltage dc (HVDC) applications. Different from the previous control methods, the proposed method utilizes the internal synchronization mechanism in ac systems, in principle, similar to the operation of a synchronous machine. By using this type of power-synchronization control, the VSC avoids the instability caused by a standard phase-locked loop in a weak AC-system connection. Moreover, a VSC terminal can give the weak ac system strong voltage support, just like a normal synchronous machine does. The control method is verified by both analytical models and time simulations.
Published in: IEEE Transactions on Power Systems ( Volume: 25, Issue: 2, May 2010)
Page(s): 809 - 820
Date of Publication: 03 November 2009

ISSN Information:


I. Introduction

Pulsewidth-Modulation (PWM)-based voltage-source converter (VSC) techniques have been widely used in grid-connected applications, such as adjustable-speed drives (ASDs) with PWM rectifiers, power quality improvement, wind turbines, etc. [1]. Thanks to the gradually increased rating and reduced costs, they have also been applied for high-voltage dc (HVDC) transmission in recent years [2]. Compared to the conventional thyristor-based HVDC, VSC-HVDC has a number of technical merits: reactive-power support to the ac system, possibility to connect to very weak ac systems, black-start capability, and lower cable cost, just to name a few.

References

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