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Analytical investigation of poorly damped conditions in VSC-HVDC systems

Yujiao Song (Institutionen för signaler och system, Reglerteknik) ; Claes Breitholtz (Institutionen för signaler och system, Reglerteknik) ; Georgios Stamatiou (Institutionen för energi och miljö, Elteknik) ; Massimo Bongiorno (Institutionen för energi och miljö, Elteknik)
the 55th IEEE Conference on Decision and Control (2016)
[Konferensbidrag, refereegranskat]

In this paper, strong AC-grid connected VSC-HVDC systems are studied. Under specific conditions, such systems can suffer from both stability and poor damping related issues, which warrants a stability study. Analytical eigenvalue expressions can directly demonstrate the impact of physical or control parameters on the system stability. However, especially in case of high-order systems, such expressions are challenging to obtain. This paper suggests a method to symbolically represent approximative eigenvalues of two-terminal VSC-HVDC systems, which could also be used to analyze the system dynamics. In addition, by applying symbolic-isolation method, the order of a multi-terminal VSC-HVDC system can be reduced to an equivalent two-terminal VSC-HVDC system, which enables the proposed method to provide symbolic pole expressions. Numerical studies based on Matlab simulations are presented, showing the accuracy of the analytical eigenvalue expressions and providing useful hints on the impact of physical or control parameters.



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Denna post skapades 2016-08-15.
CPL Pubid: 240282