电力系统混沌现象与不同失稳模式之间的关系

RELATIONSHIPS OF POWER SYSTEM CHAOS AND INSTABILITY MODES

电力系统混沌现象与随机的往复振荡相似,在电力系统安全运行中是绝对不允许出现的,同时又由于混沌现象本身的复杂性,它的存在必然对电力系统稳定性研究和失稳预防等工作产生很大的影响。该文研究的重点是弄清楚馄沌现象与系统不同失稳模式之间的关系和混沌现象在系统失稳发展过程中所处的实际位置。该文在研究过程中发现、并以示例分析了由于混沌极限环破裂(即混沌的稳定状态消失)而导致系统电压崩溃、角度失稳及电压和角度同时失稳的现象,后两种现象属于首次报道和首次研究。这些现象的存在表明,混沌现象可能是做为电力系统大扰动 失稳过程的一个中间阶段而存在。

Chaos in power systems is similar to the phenomena of random and continuous oscillations. It is absolutely forbidden in power system operation. Because of its extreme complexity, chaos has brought evident influence to the studies of power system stability and preventing of instability. Its mechanism .however, has been known very few. In this paper relationship of chaotic phenomena and instability modes are studied in order to ascertain the possible spot of chaos in the evolution of power system instability contingencies. In the studies, it is found that chaos can lead power system to voltage collapse, angle divergence, or voltage collapse and angle divergence simultaneously, when their stability conditions are broken. The latter two phenomena (chaos causing angle divergence and chaos causing angle divergence and voltage collapse at the same time) are both reported for the first time in power system stability studies. Based on the above studies, it is derived that chaos is possibly existing in power system as an intermediate stage of large disturbance instability incident.