水力机组仿射非线性预测控制研究

Study on affine nonlinear predictive control of hydraulic unit

本文首先针对一类特殊的仿射非线性系统,推导出非线性预测控制算法。然后将水力机组的基于特定工况点的仿射非线性系统模型变换为随运行工况变化的仿射非线性系统模型,并针对水力机组电液随动系统的实际约束等问题,求出其预测控制算法。最后分别对两种系统模型进行仿真计算和对比分析,结果显示第二种模型的控制品质明显好于第一种。本文算法简单快速,对提高水轮机调节系统的实时性和控制品质有现实意义。

This paper derives a nonlinear predictive control algorithm for a special class of affine nonlinear system, then converts this affine nonlinear system model for a specific operating point of hydraulic unit into one suitable for various operating conditions. To solve the model a predictive control algorithm is formulated for application to praetieal constraint problems of electro-hydraulie servo system. Simulation and comparison analysis show that the new model is better than the unconverted version in quality control. The control algorithm is simple and fast, so it is useful for improvement of real-time control and quality control of turbine system.