Study of the Effect of the DC Link on Frequency Control in Interconnected AC Systems

This paper presents a control effect of automatic frequency ratio control (AFRC) on an HVDC transmission to the AFC on ac systems when AFRC is applied to a random load disturbance in a steady state. The analysis of dynamic response of an ac-dc transmission system has been made by an analog computer. The frequency-improving and reduction effects of the output power of regulating power stations by AFRC are statistically analyzed by a digital computer.