Abstract
Application of the high voltage direct current (HVDC) system has been gradually extended due to many advantages compared to the high voltage alternate current (HVAC) system. Basically, the HVDC system has the current controller and voltage controller at the terminals of the rectifier and inverter, respectively. The control system should be properly applied to operate stably the HVDC system that depends on the system condition. That is, improving the characteristics of the control system may be needed during the transient state. In this paper, a new algorithm for improving the transient state of the HVDC systems under fault condition is proposed. The proposed control algorithm can change the control strategy of the converter. From simulations, the performance of the proposed algorithm is verified under the fault condition in the AC system.
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