High-voltage direct-current power transmission system and stability analysis method

The invention discloses a high-voltage direct-current power transmission system and a stability analysis method. The high-voltage direct-current power transmission system comprises a sending-end alternating-current subsystem, a rectifier station, a direct-current power transmission line, an inverter station and a receiving-end alternating-current subsystem which are connected in sequence. The SISO impedance model of the high-voltage direct-current power transmission system considering the complete frequency coupling characteristic is established through the multi-frequency circuit equivalent thought, and the influence of different harmonic wave truncation orders on the stability is discussed. And on the basis of dimension reduction research on the multiple-input multiple-output high-dimensional impedance matrix, stability analysis and impedance measurement verification can be conveniently carried out on the system, so that the method has relatively high practical engineering value. 本发明公开了一种高压直流输电系统及稳定性分析方法，其高