Overview of Basic Characteristics and Application Modes of DC Power Transmission

[Objective] DC power transmission technology is crucial in constructing new energy power systems. Exploration of novel applications of DC power transmission necessitate a deeper understanding and more comprehensive analyses of its underlying physical characteristics. [Methods] Based on fundamental physical principles， the inherent characteristics of DC power transmission systems can be summarized into the following five aspects： frequency isolation effect， fault current isolation effect， unlimited transmission distance， significantly enhanced power transmission capability， and absence of distributed capacitive current. Building on these inherent physical characteristics， the application modes of existing DC power transmission are established. [Results] A correlation between the inherent physical characteristics of DC transmission and various existing application modes is established. This provides a pathway for expanding DC technology applications in the context of novel energy power systems. [Conclusions] The inherent physical characteristics of the DC and AC transmission technologies exhibit complementary relationships. The strategic application of DC transmission technology within AC power grids can significantly enhance the operational performance of power systems. Future power systems will entail an organic integration of AC and DC across all voltage levels.