单区域负荷频率控制系统故障诊断研究

Fault Diagnosis of Single Area Load Frequency Control System

针对一类包含有干扰的负荷频率控制系统,提出一种利用未知输入观测器(UIO,unknown input observer)对单区域负荷频率控制系统执行机构进行故障诊断的方法。首先通过构建单区域负荷频率控制系统模型,给出系统的动态方程;其次,通过对系统中的加性未知干扰项进行解耦,构造一个使残差对未知输入具有鲁棒性,而对故障敏感的全阶未知输入观测器,以达到对执行器故障诊断的目的。最后通过Matlab仿真验证了所设计方法的正确性和可行性。

An UlO-based actuator fault diagnosis approach is proposed for single area load frequency control system in power system with load disturbance.Firstly,the dynamic equation of the load frequency control system is given by constructing a single area load frequency control system model.Secondly,in order to realize the purpose of actuator fault diagnosis,a full-order unknown input observer which can decouple the additive unknown disturbance is constructed such that the designed residual input is robust to unknown input and sensitive to actuator fault.Finally,the simulation results verify the correctness and feasibility of the proposed method.