机炉协调系统的非线性输出跟踪控制

为了克服非线性环节以及能量供需之间关联耦合作用对协调系统控制品质的影响，提高单元制发电机组的快速负荷响应能力，本文基于非线性稳定逆原理，采用非线性输出跟踪控制结构，针对一个通用的非线性协调系统模型，设计出非线性输出跟踪控制器。该控制器由稳定逆系统及反馈控制器两部分组成，稳定逆系统相当于前馈部分，用于提高系统的响应速度；反馈控制器保证了系统的稳定。在不同负荷下的仿真试验表明，依据非线性输出跟踪控制策略设计出的控制系统具有良好的解耦效果和设定点跟踪能力。

NONLINEAR OUTPUT TRACKING CONTROL FOR THE COORDINATED SYSTEM OF BOILER-TURBINE UNITS

To trail off the multivariable, nonlinear and coupling behavior of boiler-turbine units, and to improve the load-following capability of coordinated control system, a nonlinear stable inversion theory and a multivariable output tracking control structure are used to design a nonlinear output-tracking controller for a benchmark nonlinear boiler-turbine unit model. The controller is composed of stable inversion and feedback controller. The stable inversion is implemented as a feedforward controller to improve the load-following capability, and the feedback controller is utilized to guarantee the stability and robustness of the whole system. Simulation tests show that the nonlinear output tracking structure can be applied to a wide range and have good decouple performance. The electric output and the steam pressure can track the desired trajectory accurately.