Optimal transmission conversion: In this case, the number limit of AC lines that can be converted to HVDC is set to be 2. To solve the power flow of the hybrid AC/DC system, it is assumed that the rectifier control is constant power and constant firing angle while the inverter control is constant voltage and constant extinction angle. The parameter settings are elaborated in
In the 22-bus system, there exist short circuit current errors caused by DC power flow. However, the errors can be significantly reduced by introducing the compensation factor KC, thereby guaranteeing the inhibition effect of short circuit currents.