基于支路电压稳定度的电力系统无功补偿点选择

Voltage stability margin indexes based reactive power compensation node selection for power system

根据单支路稳态运行时所要满足的条件,讨论临界电压崩溃的3种情形,并应用图形直观地表示系统的电压稳定域.根据所定义的电压稳定度计算公式可快速筛选出系统的薄弱支路,若在该支路的受端安装静止无功补偿器,可以提高节点电压值及支路运行的稳定性.以IEEE 5节点算例说明对此求出的电压薄弱点进行无功补偿后,不仅维持了系统的无功功率平衡,而且也提高了该电网的电压质量和系统的稳定性.

Based on the conditions of simple alternating current circuit steady operation, three states of critical voltage collapse are discussed and the voltage stability region is shown with figures in this paper. By calculating the voltage stability margin indexes of each branch of power systems, the branches facing critical voltage collapse can be found. When SVC are installed at the end of these branches, the voltage and voltage stability margin indexes are all improved. Simulation results for the IEEE power system case with 5 nodes shows that, after VAR compensation to these weak voltage nodes, the reactive power can be balanced, the voltage quality and the stability of system can be improved.