*Article* **Robust LFC Strategy for Wind Integrated Time-Delay Power System Using EID Compensation**

#### **Fang Liu \*, Kailiang Zhang and Runmin Zou**

School of Automation, Central South University, Changsha 410083, China **\***Correspondence:csuliufang@csu.edu.cn;Tel.:+86-731-88876750

Received: 5 June 2019; Accepted: 7 August 2019; Published: 21 August 2019

**Abstract:** This paper presents an active disturbance rejection control (ADRC) technique for load frequency control of a wind integrated power system when communication delays are considered. To improve the stability of frequency control, equivalent input disturbances (EID) compensation is used to eliminate the influence of the load variation. In wind integrated power systems, two area controllers are designed to guarantee the stability of the overall closed-loop system. First, a simplified frequency response model of the wind integrated time-delay power system was established. Then the state-space model of the closed-loop system was built by employing state observers. The system stability conditions and controller parameters can be solved by some linear matrix inequalities (LMIs) forms. Finally, the case studies were tested using MATLAB/SIMULINK software and the simulation results show its robustness and e ffectiveness to maintain power-system stability.

**Keywords:** load frequency control (LFC); equivalent input disturbance (EID); active disturbance rejection control (ADRC); wind; linear matrix inequalities (LMI)
