Overview of Basic Characteristics and Application Modes of DC Power Transmission

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XU Zheng

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Abstract

[Objective] DC power transmission technology plays a crucial role in the construction of new energy power systems. To expand novel or unexplored applications of DC power transmission, we need a deeper understanding and more comprehensive analysis of its underlying physical characteristics than ever before. [Methods] Based on fundamental physical principles, the inherent characteristics of DC power transmission systems can be summarized in 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 existing DC power transmission application modes have been established. [Results] Established the correspondence between the inherent physical characteristics of DC transmission and various existing application modes, providing a pathway for expanding DC technology applications in the context of new energy power systems. [Conclusions] The inherent physical characteristics of DC and AC transmission technologies have a complementary relationship. Applying DC transmission technology strategically within AC power grids can significantly enhance the operational performance of power systems. Future power systems will feature AC and DC organically integrated across all voltage levels.

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XU Zheng. Overview of Basic Characteristics and Application Modes of DC Power Transmission[J]. Electric Power Construction. 0

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