中间再热式汽轮发电机组的多指标非线性鲁棒综合控制

摘要

The MINRCA(Multi-Index Nonlinear Robust Control Approach) is applied to design a robust integrated control model for the excitation and governing control system of reheat-turbine generator units with uncertain disturbances.Zeros and poles of the system are reasonably configured by selecting an appropriate output function,through which multiple performance indices of the reheat-turbine generator can be achieved simultaneously.The selected output function can decouple the uncertain disturbance from the zero-dynamics system.Then,the L2 gain disturbance attenuation approach is employed to alleviate negative effects of uncertain disturbances on system outputs.Consequently,the controller system can not only provide satisfactory dynamic and static performances,but also produce desired robust performance against uncertain disturbances.A three-machine power system model is designed to test the robust integrated control strategy derived from MINRCA,which finally verifies its effectiveness and superiority.%针对具有不确定干扰的中间再热式汽轮发电机组的励磁与高、中压缸汽阀综合控制系统,运用多指标非线性鲁棒控制设计方法(MINRCA)建立其鲁棒综合控制模型.通过选取适当的非线性变换输出函数,配置系统的零、极点,保证中间再热式汽轮发电机的多个性能指标的实现.该输出函数还能把系统的干扰与零动态系统解耦,然后运用L2增益干扰抑制方法,将干扰对系统输出的不利影响抑制在给定水平.从而使系统具有良好的动静态性能的同时,还具有较好的干扰抑制鲁棒性能.在三机电力系统中,对基于MINRCA所得出的鲁棒综合控制律进行仿真分析与讨论,验证其有效性及优越性.