E5.18 A system is shown in Figure E5.18(a). The response to a unit step, when K=1, is shown in Figure E5.18(b). Determine the value of K so that the steady- state error is equal to zero. Answer: K= 1.25. K G(s) Y(st R(A) (a)

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HVDC

HVDC stands for high voltage direct current in the electric power transmission system. The high voltage direct current system uses direct current (DC) for the transmission of electrical power through transmission lines in contrast with the alternating current that is the AC system. The HVDC is used to transmit bulk power point-to-point through long distances transmission lines. Power is rapidly transferred because the efficiency of transmission lines is greatly increased over long distances due to HVDC lines.