A Distributed DC Voltage Control Method for VSC MTDC Systems

Abstract With the development of VSC HVDC transmission, the realization of the first VSC MTDC grid is coming within reach. An outstanding issue is DC voltage control in MTDC systems. The easiest way to maintain stable operation is to assign the task of DC voltage regulation to one converter. This paper discusses a control strategy for an extended VSC MTDC grid using a typical DC voltage control on one DC bus, combined with a DC voltage droop characteristic on the other DC buses. The impact of the proposed control structure on the stability of the AC and DC grid is investigated by numeric simulations using the MatDyn software package.

[1]  T. Nakajima,et al.  A control system for HVDC transmission by voltage sourced converters , 1999, 1999 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364).

[2]  P.L. Dandeno.  Current Usage & Suggested Practices in Power System Stability Simulations for Synchronous Machines , 1986, IEEE Transactions on Energy Conversion.

[3]  Ronnie Belmans,et al.  MatDyn, A New Matlab-Based Toolbox for Power System Dynamic Simulation , 2011 .

[4]  Ronnie Belmans,et al.  Generalized Dynamic VSC MTDC Model for Power System Stability Studies , 2010, IEEE Transactions on Power Systems.

[5]  John Blau.  Europe plans a North Sea grid , 2010 .

[6]  Liangzhong Yao,et al.  Multi-terminal DC transmission systems for connecting large offshore wind farms , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[7]  Xiaoxin Zhou,et al.  VSCs based HVDC and its control strategy , 2005, 2005 IEEE/PES Transmission & Distribution Conference & Exposition: Asia and Pacific.