Step response test methods are generally used to evaluate synchronous generator excitation system performance, but this method can not be implemented online. A method for evaluating the excitation system performance of the minimum variance control benchmark is proposed. Performance of the system under the action of the minimum variance controller output is considered as the upper bound of performance. The ratio of this output performance and actual output performance of the system is defined as the performance index. To avoid expanding the Diophantine equation, filtering and correlation analysis (FCOR) algorithm is introduced. The analysis results show that this method only requires synchronous generator output voltage data and a priori knowledge of the system dead time. Simulation results show that this method simplifies the calculation process, and evaluates the performance of excitation control system timely and accurately.%对同步发电机励磁系统性能评价一般通过阶跃响应方法，但该方法无法在线进行，为此提出了最小方差控制基准的性能评估方法。对系统设计最小方差控制器并作为系统控制性能上限，与系统实际性能进行比较而得到性能指标，并对该方法进行系统滤波和相关性分析 FCOR(Filtering and Correlation Analysis)算法的改进，避免了 Diophantine 方程的展开运算。分析表明该评估方法只需利用同步发电机输出端电压数据，结合系统时滞d就可以得到励磁系统的性能指标。仿真结果表明该方法简化了计算过程，能够及时准确地在线评估励磁系统的控制性能。
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