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Modeling and Simulation of Voltage Source Converters Based On Energy Function and Power Flow Control Using UPFC

Challa Krishna Rao

Abstract


This paper proposes a nonlinear control strategy for PWM Voltage Source Converters (VSCs). A passivity-based approach, resulted from Lyapunov Direct Method, is presented for designing an effective nonlinear VSC controller to improve their dynamic behaviors under perturbed conditions. The differential equations of converters are obtained and then transformed to d-q frame. Considering the nonlinearity of transformed equations, Lyapunov Direct method is utilized to find a solution to improve the transient response. The time derivative of Lyapunov function guaranties that increasing its dissipative term will result in a trajectory of VSC system to return to the equilibrium point more quickly. The proposed control strategy can be simultaneously applied to multi-VSC devices such as UPFC. Also, it is shown that the proposed strategy meets the steady state requirements without using any other control loop. As an example, a 3-machine system with a UPFC is studied to verify the effectiveness of the proposed strategy.

 

Keywords: Voltage source converter (VSC), energy function, passivity based control


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References


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