Intelligent Pre-decision of Two-stage Emergency Load Shedding Control in Power Systems
Power system simulation analysis is an important technology in the field of safety and stability control,which can be used to formulate and verify emergency control measures.The traditional manual analysis of simulation data to decide emergency control measures relies heavily on expert experience,which is time-consuming and labor-intensive when applied to complex large power grids.In this paper,a two-stage emergency load shedding control intelligent pre-decision method is proposed.The first stage decides the load shedding point,and the second stage decides the load shedding amount.Firstly,based on the simulation data,three voltage instability modes are distinguished:pure voltage instability,coupled voltage instability and mixed voltage instability,and different load screening methods are used respectively;Estimate the total amount of load shedding required for the system to restore stability,and allocate it according to the load order.Combined with the temporary stability simulation,the effectiveness of the control measures is verified,and the amount of decision-making is adjusted.Taking my country's Northeast Power Grid as an example,the simulation study verifies the advantages of the proposed two-stage intelligent decision-making method in terms of effectiveness,rapidity and accuracy compared with the fully iterative trial-and-error method when the emergency control measures of the large power grid are formulated.
power grid simulation analysistransient voltage instabilityemergency controlload sheddinglight gradient boosting machine
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