A STABILITY MODEL FOR THE ADVANCED SERIES COMPENSATOR (ASC)

This paper develops an accurate and general stability model for the AS C. The model is valid for both the capacitive and inductive regions of the ASC operation. It is accurate in that the instantaneous voltage a nd current waveforms and also the fundamental component of the capacit or voltage (needed for stability) are determined every half-cycle by s olving the differential equations of the ASC circuit. The model is cap able of incorporating any control algorithms. The validity of the mode l is demonstrated by comparing the model with the Electro-Magnetic Tra nsient Program (EMTP) digital simulations using step time of 10 mu s.