Abstract
New generation of large-capacity synchronous condensers (SC) is used in ultrahigh-voltage direct current (UHVDC) engineering. It aims to improve the commutation failure of DC system and suppress the transient over-voltage of the system by using its dynamic reactive characteristics. Therefore, it is necessary to accurately evaluate the transient reactive output capability of the SC. Firstly, based on the mathematical model of SC, the transient reactive power expression in the grid fault is deduced. Secondly, the saturation of the SC parameters, the steady-state reactive power, and the degree of grid voltage change are analyzed. Finally, the SC simulation model is established based on the actual SC electromagnetic parameters, and its transient reactive output characteristics are simulated and compared with the theoretical analysis results. The results show that the transient reactive power output of the SC will increase when parameters become saturated. The output transient reactive power increment of the SC increases with the increase of the surge degree of power grid voltage. The output transient reactive power increment of the SC increases and then decreases with the drop degree of power grid voltage. It can provide more effective reactive power support for the system when the steady-state operation of the SC is in phase advance and when the power grid fails.
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