柴油发电机组H_2励磁控制器的研究

船舶电力系统电压的稳定性主要取决于船舶电站同步发电机调压系统的电压响应特性.为了抑制负荷扰动的影响,提高同步发电机调压系统的动态性能,将H_2控制理论应用于同步发电机调压系统的设计,将系统的性能要求转化为标准H_2控制问题.首先分别建立相复励装置和无刷励磁同步发电机的数学模型,然后建立采用H_2励磁控制器的同步发电机调压系统的数学模型.针对外部干扰和模型的不确定性,H_2励磁控制器的设计可以归结为混合灵敏度问题.在分析同步发电机模型不确定性的基础上,合理地选取加权函数,通过解Riccati方程,得到H_2励磁控制器.计算机仿真结果表明:设计的H_2励磁控制器,能在充分考虑系统模型不确定性的情况下,有效地提高系统的动态性能和抑制扰动的能力,改善船舶电力系统电压的稳定性.

Research on H_2 Excitation Controller for Diesel-generator

The voltage stability of ship power system is decided by the dynamic characteristic of the synchronous generator voltage regulation system in the ship power station. In order to restrain the load disturbance and improve the dynamic performance of the synchronous generator voltage regulation system, this paper presents the design of a controller for a synchronous generator voltage regulation system with H-two control theory, which transforms the specifications of the system into a standard H_2control problem. First, the mathematical model of a phase-compounding excitation unit and brushless excitation synchronous generator is presented, then the mathematical model of a synchronous generator voltage regulation system is set up using H-two excitation controller. To counter external disturbance and model uncertainty, the design of H-two excitation controller rests on the problem of mixed sensitivity. Weighting functions are selected rationally on the basis of analyzing the model uncertainty of synchronous generator, and the H-two excitation controller is achieved by solving the Riccati equation. Computer simulation shows that the H-two excitation controller improves the dynamic performance of the system and its ability to restrain the load disturbance in case of the uncertainty of system model, thus improves the voltage stability of the ship power system.