柴油发电机组并联运行的混沌振荡分析

The analysis of chaos oscillation for a diesel-generator set on a parallel connection

船舶电力系统通常是多台柴油发电机组并联运行,在轻载工况运行时会发生非周期、貌似随机的、突发或阵发性的电力系统振荡现象,具有混沌过程的特征,严重时会导致船舶电力系统解列,对船舶电网的安全运行构成了威胁.为了对船舶电力系统的混沌现象进行分析,建立了2台柴油发电机组并联运行的非线性数学模型,该模型准确地反映了2台柴油发电机组各变量的变化规律,体现两者之间相互作用和相互影响的关系.利用Lyapunov指数法对船舶电站2台柴油发电机组轻载并联运行工况进行了分析,证明了混沌现象的存在,得出了船舶电力系统的非线性和2台柴油发电机组之间的功率传递是产生混沌现象根本原因的结论.混沌现象是稳定状态与不稳定状态之间的过渡状态,必须加以预防,才能保证系统的稳定性.

：Several diesel-generator sets usually operate on a parallel connection in a ship power system. An oscilla- tion phenomenon of a power system which is acyclic, random, and gusty or paroxysmal wiil occur during light load working conditions; it has the feature of chaos processing, which can result in ship power system sectionalizingwhen it is serious. Safety operation of the ship power network will be threatened. In order to analyze the chaos phe- nomenon of the ship power system, a nonlinear mathematical model of two diesel-generator sets on a parallel con- nection was built in this paper, which reflected the variation law of each varible in two diesel-generator sets, descri- bing the relationship of interaction and mutual influence between the two sets. The light load working condition of the two diesel-generator sets on a parallel connection in the ship power station was analyzed by using the Lyapunov index method, which proved the presence of the chaos phenomenon. The conclusion was drawn that the ultimate reason for producing the chaos phenomenon is the nonlinear feature of the ship power system and power transfer be- tween two diesel-generator sets. The chaos phenomenon is a transition state between the stability and instability states, which must be prevented so as to ensure the stability of system.