For improving dynamic reactive power support capability and suppressing the DC commutation failure

it is a new trend to configure synchronous condenser at the DC converter station for emergency control.However

at present

the synchronous condenser is only used for transient support

the reactive power output is basically zero during steady-state operation

ignores its steady-state reactive power adjustment capabilityand is not able to fully utilize the reactive support of the new generation of synchronous condenser.In this paper

a kind of coordination control strategy of synchronous condenser based on voltage-reactive marching and the reactive power voltage of UHV DC is proposed on the basis of existing control strategy of UHVDC reactive power voltage and synchronous condenser so to achieve voltage fluctuation suppression in the switching of filter bank and reactive power compensation in the switching of the fixed capacitor

which can effectively reduce the risk of commutation failure caused by voltage fluctuations to UHVDC operationand improve the economic s of AC filter bank operation.