二三道防线中切机措施对失步振荡中心的影响

电网多重故障下,二三道防线切机措施可能对失步振荡中心产生影响,并严重影响电力系统安全稳定运行。本文先从理论上分析得到二三道防线切机措施影响失步振荡中心迁移的规律,再以实际电网为研究对象,基于BPA仿真计算,研究多重故障下不同切机措施机组类型、位置、数量等差异对失步振荡中心的影响,并提出安控切机建议措施和高频切机优化方案。分析结果表明:在失步振荡过程中,二三道防线切机措施会影响失步振荡中心朝切机侧迁移。因此,在安控切机措施中应尽量避免切除振荡中心附近大容量火电机组,在高频切机方案中应先切除稳定性能较差的机组。

Influence of generator-shedding measures on out -of-step oscillation center in the second and third defense line

The out-of-step oscillation center may be influenced by generator-shedding of second andthird defense line with multiple faults in power grid, which seriously affect the safety and stability ofpower system. In this paper, generator-shedding influence on out-of-step oscillation center migrationis researched on theory and simulation. The actual power grid is studied to analyze the influencefactors, such as the generator position, capacity, and type in generator-shedding. Based on the theoryand BPA simulation, suggested measures are proposed. The oscillation center under generatorshedding will be migrated to the generator side, large capacity thermal power generations which nearthe oscillation center should not be cut, and vulnerable generators should be cut quickly.