Abstract

This paper analyzes the calculation principle of DC transmission line loss and economic current density, specific to the loss of each component of the HVDC system, studies the evaluation method of AC/DC transmission line operation efficiency that can reflect the characteristics of long-distance, large-capacity, high-voltage and clean environmental protection of DC transmission, including economic benefit indicators and environmental benefit indicators, analyzes the key factors affecting the operation efficiency of transmission lines, and proposes measures to reasonably improve the operation efficiency of DC transmission, it includes four measures to improve the transmission voltage level, optimize the power flow of each DC transmission system, select appropriate conductor cross-section, and reduce line maintenance costs.

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