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On the Centralized Nonlinear Control of HVDC Systems Using Lyapunov Theory

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1 Author(s)
Eriksson, R. ; Department of Electric Power Systems, KTH Royal Institute of Technology, Stockholm, Sweden

The security region of a power system is an important and timely issue; different stability criteria may be limiting. Rotor-angle stability can be improved by modulating active power of installed high-voltage direct current (HVDC) links. This paper proposes a new centralized nonlinear control strategy for coordinating several point-to-point and multiterminal HVDC systems based on Lyapunov theory. The proposed control Lyapunov function is negative semi-definite along the trajectories and uses the internal node representation of the system. The proposed control Lyapunov function increases the domain of attraction and, thus, improves the rotor-angle stability. Nonlinear simulations are performed on the IEEE 10-machine 39-bus system which shows the effectiveness of the controller. In comparison, simulations using the conventional lead-lag controller are also run.

Published in:

Power Delivery, IEEE Transactions on  (Volume:28 ,  Issue: 2 )

Date of Publication:

April 2013

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