Abstract
The ±1100 kV DC system impedance model is analyzed under various disturbances. For various disturbances, the positions of simulating voltage sources in the DC loop for impedance analysis are different. Taking the 2688 km ±1100 kV DC power transmission project from Zhundong to Chongqing for example, the impedance-frequency characteristics of DC loop is calculated by PSCAD/EMTDC. By simulating under various operating modes and conditions, the impacts of modes and firing angle of the converters on the DC loop impedance-frequency characteristics are studied. Influence of the length of DC transmission lines on DC loop resonant frequency is studied as an important factor of system resonance. Faults of AC net such as interphase short circuit and single-phase faults is proved to produce 50 Hz positive sequence harmonics in the AC side and 100 Hz disturbances in the DC loop. Finally, two kinds of mitigation measures of low frequency resonance are proposed and the effect is simulated.
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