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Abstract To avoid removing the overload lines caused by power flow transferring,a zone-divided emergency control strategy for overload lines based on power sensitivity is put forward.Based on the current correlation coefficient matrix,the power sensitivity matrix between line power variables and nodal injection power variables is derived.The balance machine is introduced to the emergency control.Then the complex phasor calculation is simplified to real number calculation.The power system is divided into generalized power flow transferring zones according to the network topology.The nodes outside of the zone and the zone connecting cut point are proved to be with very closed power sensitivity for lines inside the zone.So the computational area can be simplified to the generalized power flow transferring zone to which the overload lines belong.With the combination of the local sensitivity calculation and the sparse vector techniques,the amount of calculation and memory are greatly reduced.The control node group is obtained by comprehensive sensitivity.Considering the redundant power of normal lines,the reverse equal amount adjustment method is used to determine the adjustment power amount,which avoids the tidal flow check and improves the emergency control speed.The validity and the superiority of the method are verified with IEEE39 and IEEE118 bus systems.
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Received: 17 December 2014
Published: 08 September 2015
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2015, Vol. 30 
