考虑负荷暂态过流特性与电网暂态电压稳定约束的电解铝负荷紧急控制策略

Due to the uneven geographical distribution of loads and new energy resources, wind and solar curtailments are serious in southwest and northwest China. In order to promote the consumption of new energy, many areas introduce large quantities of high-energy-consuming loads such as electrolytic aluminum. However, due to the lack of effective emergency control methods for electrolytic aluminum loads, the security and stability of power grids with high proportions of electrolytic aluminum loads become increasingly prominent. Therefore, this paper proposes an emergency control strategy that takes into account the transient overcurrent characteristics of the load and the transient voltage stability of the power grid. Graded load shedding is achieved by cutting off the parallel rectifier units. And considering the transient overcurrent characteristics of the load, the maximum number of cuttable rectifier units is evaluated. Taking into account the transient voltage stability constraints, an optimization model of emergency load shedding is established to ensure the safety and stability of the power grid while minimizing users’ losses. The simulation is done in Real Time Digital Simulator (RTDS) and the results verify the validity of the proposed emergency control strategy.