分散励磁式船舶电力系统鲁棒控制器研究

Robust controller of decentralized excitation for ship generator

给出了分散励磁式船舶电力系统柴油机发电机组的数学模型,明确了模型中各种干扰项的物理意义。将发电机组数学模型线性化后,增广为广义受控系统,应用H∞控制理论,设计了发电机的分散励磁鲁棒控制器,并应用线性矩阵不等式(LMI)方法,将H∞控制器的设计转化为一个线性矩阵不等式约束和线性目标函数的凸优化问题,对H∞控制器求解和优化。仿真结果表明,当电力系统受到干扰后,H∞鲁棒励磁控制器比传统的电力系统稳定(PSS)励磁控制器具有更强的抗干扰能力,并使电力系统在较短时间内恢复稳定。

The mathematic model of decentralized excitation for diesel generator group of the ship power system is deduced,with the physical meanings of all interferences defined. After the mathematic model is linearized and extended into a generalized controllable system,H∞ control theory is used to design the decentralized excitation robust controller for generators. The LMI（Linear Matrix Inequality） method is then used to solve and optimize the controller by transforming the control rule into a convex optimization problem with linear matrix inequality constraints and linear objective function. Simulations show that,the H∞ robust excitation controller has better anti-interference ability than traditional power system stability controllers,which makes the power system stable in a shorter time.