Abstract
In order to study the changing characteristics of electrical variables during the operation process of UHVDC system with hierarchical connection to AC system, using the main circuit parameters of Ximeng-Taizhou 800 kV UHVDC transmission system which has been put into operation and referring to the control system of CIGRE HVDC standard test system, the simulation models of the AC system, converter, converter transformer, flat wave reactor, AC and DC filter and DC line of the transmission system of the Ximeng-Taizhou project are established by PSCAD. The model is used to simulate the positive, negative and bipolar full voltage operation mode, and the simulation results are compared with the system design parameters. It can be seen that the simulation model can more accurately simulate the Ximeng-Taizhou project, and can be used as an effective simulation tool for further research on the UHVDC transmission projects such as the Ximeng-Taizhou project with hierarchical connection to AC system.
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