Abstract

With the voltage levels and capacity of UHVDC system increasing, synchronous condensers are installed in converter station to provide subtransient and transient voltage support, also it’s required to consider the demand of steady-state reactive power. Therefore the automatic voltage control (AVC) system plays a vital role in the operation and function of synchronous condenser. In this paper, taking a receiving-end condenser station for example, the overview of AVC substation is introduced, then the control strategy and switching logic between different working modes are analyzed using experimental data. Finally the impedance between the station bus and infinite power system is derived, and a method to calculate the maximum regulating value of bus voltage by synchronous condensers under steady state is proposed.

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