Method for controlling load shedding of power supply system of electrolytic aluminum production line

Abstract

The invention relates to a method for controlling load shedding of a power supply system of an electrolytic aluminum production line, in particular to a method for controlling load shedding in a large-load direct power supply system of an electrolytic aluminum production line composed of a diode rectification electrolytic aluminum production line and a plurality of silicon controlled rectifier rectification electrolytic aluminum production lines. When a power supply or a sending-out line in a power supply system fails, the electrolytic aluminum load in the system is cut off through a power generation-power utilization power balance control logic principle. Therefore, stable operation of a power grid under a new working condition is ensured, and the risks of full stop and network crossing of one or more electrolytic aluminum production lines when a small amount of load is cut off due to the fact that the maximum cuttable load capacity of the electrolytic aluminum production line is notconsidered under the failure of the power supply or the sending-out line are avoided.

Description

technical field [0001] The invention relates to a control method for load shedding of the power supply system of an electrolytic aluminum production line, in particular to the control of load shedding in the large-load direct power supply system of the electrolytic aluminum production line composed of a diode rectified electrolytic aluminum production line and a plurality of thyristor rectified electrolytic aluminum production lines method. Background technique [0002] The grid operation of the direct power supply system from large power sources to large loads is relatively weak. When unit tripping and load off-grid failures occur in the grid, the safety and stability control device configured in the grid operates reliably and cuts off the load and some units in the grid to ensure the stability of the grid. run. In the early stage of operation of the system, since the large units and electrolytic aluminum loads in the network are newly put into operation, there are frequen...

AI Technical Summary

Problems solved by technology

In the early stage of operation of the system, since the large units and electrolytic aluminum loads in the network are newly put into operation, there are frequent trips of large units due to human factors and equipment factors in the early stage of operation, and the removal of electrolytic aluminum loads in the network often occurs. Due to the particularity of the electrolytic aluminum load, when the load of a certain series exceeds half of the load of this series, the series cannot operate normally at the moment of cutting, and all the loads of this series will go off the grid at the moment of cutting.

Therefore, the above stability control logic has not considered the risk that a single series or two series will be completely disconnected from the grid during the logic execution process when two or more large units trip. , causing huge economic losses