Dynamic Adjustment of Electric Spring Voltage Compensation Range Based on Fixed Series Compensation

This paper proposes a new control strategy to improve the effective voltage compensation range of electric springs (ES) under reactive compensation modes. The influence of line impedance, including its resistive part and inductive part, on ES regulation ability is analyzed, which shows that the compensation range of ES is more sensitive to the inductive part of the transmission line impedance than the resistive part. Through the introduction of a fixed series compensation (FSC) device, only the reactance of the transmission line impedance is changed without changing the line voltage level and topology structure, thus the improvement of ES voltage regulating capacity is realized. Simulation results are provided to verify the correctness of the analysis and the proposed control strategy.