柴油发电机组并联运行的混沌控制

摘要

The ship power system consists of several diesel-generator sets which usually operate in parallel. In the power system there appears chaos oscillation phenomenon which is acyclic, random, gusty or paroxysmal in light load working conditions. In order to analyze the chaos phenomenon of the ship power system, a nonlinear mathematical model of two diesel-generator sets operating in parallel was established. The model can accurately reflect the variation law of each varible in the two diesel-generator sets, thereby showing the relationship of interaction and mutual influence between the two sets. The analysis of the light load working conditions for two diesel-generator sets in parallel by Lya-punov index method proves the presence of chaos phenomenon. A nonlinear robust synthetic controller was designed on the basis of the nonlinear mathematical model of the diesel-generator sets and by combining the direct feedback linearization with the robust control theory, thus leading to a nonlinear robust synthetic control law for the diesel-generator set. The computer simulation results show that the nonlinear robust synthetic controller can effectively suppress the chaos phenomenon in the power system and improve the stability for ship power system.%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性、貌似随机的、突发或阵发性的电力系统混沌振荡现象.为了对船舶电力系统的混沌现象进行分析,建立了两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两台柴油发电机组各变量的变化规律,能够体现两者之间相互作用和相互影响的关系.在此基础上,利用Lyapunov指数法对船舶电站两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.以柴油发电机组的非线性数学模型为基础设计了非线性鲁棒综合控制器,将直接反馈线性化和鲁棒控制理论相结合应用于柴油发电机组综合控制器的设计,获得了柴油发电机组非线性鲁棒综合控制律.计算机仿真结果表明:设计的非线性鲁棒综合控制器有效地抑制了电力系统的混沌现象,改善了船舶电力系统的稳定性.