Analysis of Transient Voltage Stability Under the Interaction Between HVDC Receiving End and New Energy Station

When Short-circuit fault occurs at the receiving end of High Voltage Direct Current (HVDC), it is easy to cause voltage instability of the new energy station at HVDC receiving end. Therefore, the mechanism of the interaction between the new energy station and the HVDC receiving end and its influence on the voltage stability are analyzed. Firstly, the mathematical model of the new energy station is established by taking the photovoltaic (PV) station as an example, and its active power-voltage and reactive power-voltage characteristics are deduced. The active-voltage characteristics determine the upper limit of voltage recovery rate at the receiving end. The reactive power-voltage characteristics show that the reactive power characteristics of the new energy station are similar to that of the capacitor. Secondly, through the power flow equation of the HVDC receiving end, the influence of the active power-voltage characteristics on the voltage stability of the receiving end is analyzed. Finally, the deduced active power-voltage and reactive power-voltage characteristics of the new energy station are verified by simulation, and the output active power of the new energy station will affect the voltage recovery rate at HVDC receiving end, and thus affect the voltage stability.