Sinusoidal-Excitation-Based Impedance Detection Method to Compensate for Cable Voltage Drop in Remote Power Systems

In remote power supply scenarios, long-distance transmission cables introduce voltage drops due to their inherent impedance, leading to load undervoltage. Additionally, dynamic current variations may cause significant fluctuations in load voltage, potentially exceeding the allowable voltage range. To address these challenges, this paper proposes a sinusoidal-excitation-based impedance detection method, which can achieve source-side single-ended impedance detection of the cable. Based on the detection results, a composite control strategy is developed to compensate for both steady-state and transient voltage drops, effectively mitigating the impact of current variations on load-voltage stability. The operating principle and parameter design are analyzed. Experimental testing is carried out using a hardware prototype with an equivalent R-L test loop, and the verification and comparative results indicate that the proposed method effectively resolves voltage drop and response delay issues caused by long cables, achieving accurate and stable remote voltage regulation.