Unified Model of HVDC Rectifier Station with Controller under Different Operating Conditions

In view of the gradual complexity of the HVDC transmission system, when it is only necessary to study the power characteristics of the DC transmission system, the detailed mechanism model runs slowly, occupies a large amount of memory, and is not suitable for the simulation of large systems. Therefore, it is urgent to find a unified model that can accurately reflect the output characteristics of the DC system while appropriately ignoring the internal process, and analyze the characteristics of the HVDC sending-end system in a targeted manner. In view of this, this paper proposes a unified model of the HVDC rectifier station including the controller, which is divided into different operating time domains and operating conditions. By using the CIGRE HVDC reference system, the characteristics of the controller and the output power of the rectifier station side are analyzed under various operation conditions, and non-mechanical models are established in the case of DC blocking, commutation failure and commutation success, respectively, and use the optimization toolbox to identify the model parameters of each module. Finally, compared with the CIGRE HVDC benchmark system, the validity of the proposed model is verified.