中文摘要：

推导了前馈-反馈控制系统性能评价的理论过程,将此评价方法应用到火电厂锅炉给水控制系统中,并对评价结果进行了分析.分析结果表明：前馈控制器的加入可抑制可测噪声的影响,从而减小输出方差,提高系统的性能.但是,前馈控制器必须设计合理,否则会降低系统的性能.此外,控制系统性能评价可以指导控制器参数的选择.

英文摘要：

In this paper,we make an assessment of the typical thermal power plant boiler water supply system. Since water supply system is a feedback/feedforward control system, so we should assess it using the method based on the feedback/feedforward control system. In this paper,firstly,we deduce the theoretical process of the performance assessment of the feedback/feedforward control system based on the minimum variance. Then we assess the performance of the boiler water supply system,and make an analysis of the assessment results. The analysis results show that：the feedforward control can reduce the variance of the output by improving the performance of the system; the assessment results can guide tuning the parameters of the controller; the feedforward controller is a ＂special＂ controller based on the characteristics of the objects. So, it should be designed reasonably. If it is designed unreasonably ,the performance of the system will become worse.