Journal Articles - Engineering Technology - 2021

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Browsing Journal Articles - Engineering Technology - 2021 by Author "Anh-Tuan Tran"
  • Publication
    Adaptive Integral Second-Order Sliding Mode Control Design for Load Frequency Control of Large-Scale Power System with Communication Delays
    ( 2021)
    Anh-Tuan Tran
    ;
    Bui Le Ngoc Minh
    ;
    Phong Thanh Tran
    ;
    Van Van Huynh
    ;
    Van-Duc Phan
    ;
    Viet-Thanh Pham
    ;
    Tam Minh Nguyen
    ;
    Rui Wang
    Nowadays, the power systems are getting more and more complicated because of the delays introduced by the communication networks. The existence of the delays usually leads to the degradation and/or instability of power system performance. On account of this point, the traditional load frequency control (LFC) approach for power system sketches a destabilizing impact and an unacceptable system performance. Therefore, this paper proposes a new LFC based on adaptive integral second-order sliding mode control (AISOSMC) approach for the large-scale power system with communication delays (LSPSwCD). First, a new linear matrix inequality is derived to ensure the stability of whole power systems using Lyapunov stability theory. Second, an AISOSMC law is designed to ensure the finite time reachability of the system states. To the best of our knowledge, this is the first time the AISOSMC is designed for LFC of the LSPSwCD. In addition, the report of testing results presents that the suggested LFC based on AISOSMC can not only decrease effectively the frequency variation but also make successfully less in mount of power oscillation/fluctuation in tie-line exchange.
  • Publication
    Load Frequency Control for Multi-Area Power Plants with Integrated Wind Resources
    ( 2021)
    Van Van Huynh
    ;
    Bui Le Ngoc Minh
    ;
    Emmanuel Nduka Amaefule
    ;
    Anh-Tuan Tran
    ;
    Phong Thanh Tran
    ;
    Van-Duc Phan
    ;
    Viet-Thanh Pham
    ;
    Tam Minh Nguyen
    To provide a more practical method of controlling the frequency and tie-line power flow of a multi-area interconnected power system (MAIPS), a state observer based on sliding mode control (SOboSMC) acting under a second-order time derivative is proposed. The proposed design is used to study load frequency control against load disturbance, matched and mismatched uncertainty and parameter measurement difficulties of power systems that exist in the modern power plant, such as multi-area systems integrated with wind plants. Firstly, the state observer is designed to optimally estimate system state variables. The estimated states are applied to construct the model of the MAIPS. Secondly, a SOboSMC is designed with an integral switching surface acting on the second-order time derivative to forcefully drive the dynamic errors to zero and eliminate chattering, which can occur in the first-order approach to sliding mode control. In addition, the stability of the total power system is demonstrated with the Lyapunov stability theory based on a new linear matrix inequality (LMI) technique. To extend the validation of the proposed design control for practical purposes, it was tested in a New England system with 39 bus power against random load disturbances. The simulation results confirm the superiority of the proposed SOboSMC over other recent controllers with respect to overshoot and settling time.
  • Publication
    Load Frequency Regulator in Interconnected Power System Using Second-Order Sliding Mode Control Combined with State Estimator
    ( 2021)
    Anh-Tuan Tran
    ;
    Bui Le Ngoc Minh
    ;
    Van Van Huynh
    ;
    Phong Thanh Tran
    ;
    Emmanuel Nduka Amaefule
    ;
    Van-Duc Phan
    ;
    Tam Minh Nguyen
    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.