Load Frequency Regulator in Interconnected Power System Using Second-Order Sliding Mode Control Combined with State Estimator

PhD.Phan Van DucAnh-Tuan TranBui Le Ngoc MinhVan Van HuynhPhong Thanh TranEmmanuel Nduka AmaefuleTam Minh Nguyen

Faculty of Automotive Engineering

Research output: Article


In multi-area interconnected power systems (MAIPS), the measurement of all system states is difficult due to the lack of a sensor or the fact that it is expensive to measure. In order to solve this limitation, a new load frequency controller based on the second-order sliding mode is designed for MAIPS where the estimated state variable is used fully in the sliding surface and controller. Firstly, a model of MAIPS integrated with disturbance is introduced. Secondly, an observer has been designed and used to estimate the unmeasured variables with disturbance. Thirdly, a new second-order sliding mode control (SOSMC) law is used to reduce the chattering in the system dynamics where slide surface and sliding mode controller are designed based on system states observer. The stability of the whole system is guaranteed via the Lyapunov theory. Even though state variables are not measured, the experimental simulation results show that the frequency remains in the nominal range under load disturbances, matched and mismatched uncertainties of the MAIPS. A comparison to other controllers illustrates the superiority of the highlighted controller designed in this paper.

Publication year
07 Feb 2021
Original language
Published Journal
Volume No
Vol. 14 No. 4
ISI/Scopus Indexed
ISSN index

Access Document Overview

To read the full-text of this publication, you can request a copy directly from the authors.