Abstract
Multi-terminal high voltage direct current (MTDC) has many features including multiple sending ends, multiple receiving ends, and high transmission capacity. These make it highly competitive in both technical and economic terms. In designing a MTDC system, the calculation of the main circuit steady-state parameter plays a fundamental role. However, existing researches mainly focus on parallel multi-terminal DC transmission systems (P-MTDC), few looks into series multi-terminal DC transmission systems (S-MTDC). Therefore, this study researches into the calculation of the main circuit steady-state parameters for S-MTDC transmission systems. First of all, the two types of MTDC transmission systems, S-MTDC and P-MTDC, are briefly introduced and compared. Then, the calculation of the steady-state parameter of the main circuit for two-terminal high voltage direct current (HVDC) transmission systems is explained. Based on this calculation method, research on the main circuit steady-state parameter for S-MTDC transmission systems is conducted and the design of calculation of steady-state parameter of the main circuit is presented in detail. Finally, this study designs a series four-terminal HVDC systems and verifies the calculation method of the steady-state parameter of the main circuit.
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