| The load-center substation is the pivotal node which collects power sources and contact line or connects different power systems. The static var compensator (SVC) is widely used in the substation with different voltage level because of its rapid and accurate voltage adjustment capability and indispensable support function for system security and stability.In view of there are multiple voltage levels in the load-center substation and consider the application of SVC, this paper analyzes the effect of switching capacitive reactance, adjusting the main transformer tap and the control of SVC on the voltage and reactive power in substation, based on this analyze a coordinated control strategy to coordinate the shunt capacitors and reactors, on-load transformer and SVC is proposed, which is based on the dynamic rapid adjustment capability of SVC and give the control scheme of the shunt capacitors and reactors and transformer tap in the different of the output of SVC.Considering the active loss of transformer, another voltage and reactive power integrated control strategy is proposed to optimally determine the adjustment of transformer tap, the switching of capacitors and reactors and the output of SVC to minimize the active loss of transformer and the bus voltage fluctuation by on-line optimization calculating and distributing of reactive power under the premise that the voltage is qualified and the reactive power reserves of SVC is adequate.The two control strategy is simulated based the actual substation as an example, the simulation results show that the coordinated control strategy can both ensure the voltage is qualified and the reactive power reserves of SVC is adequate; the integrated control strategy can track and compensate voltage and reactive power fluctuation caused by loads changing on line and find the best control scheme to minimize the active loss of transformer and the bus voltage fluctuation under restrained conditions. |
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