Abstract
The high voltage direct current (HVDC) control model is grounded on limiting which is applied to the calculation of large-scale AC/DC power grids. However, the HVDC control model is based on selecting in some practical projects. There is little difference in the two control simulation results under strong system conditions. But the difference in the HVDC control model will significantly affect the system stability characteristics in the face of the weak sending-end system. To intensive study impact of HVDC control differences on system stability at different sending-end grid strengths, an AC/DC combined system containing the manufacturer's HVDC package is modeled based on the measured project parameters on the platform of RTDS in this paper. First, the model block diagram of two control system are analyzed. It pointed out the HVDC active power recovery rate is not determined by a single control link but is the result of various control links interaction during the dynamic process. Then, the influence of the rapid recovery of the HVDC active power on the system stability is analyzed when AC/DC fault happens. Finally, models used in RTDS and models used in calculation are compared to analyze the difference reasons in the HVDC active power recovery rate on the system stability under different conditions. Simulation results show the difference in minimum firing angle control is the main reason for the difference in DC active power recovery rate. When the sending-end system is weak, the rapid recovery of HVDC power is not conducive to the voltage stability on condition that the short-circuit ratio is small-but is beneficial to the rotor angle stability on condition that the short-circuit ratio is large.
Published Version
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