Robust Nonlinear Adaptive Feedback Linearizing Decentralized Controller Design for Islanded DC Microgrids

Mahmud, M. A.; Roy, T. K.; Saha, Sajeeb; Haque, M. E.; Pota, H. R.

doi:10.1109/tia.2019.2921028

Cited by 81 publications

(38 citation statements)

References 27 publications

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“…Obviously, V is positive definite andV is negative definite, satisfying the Lyapunov stability theorem, so the desired equilibrium point x id is asymptotically stable [50][51][52][53].…”

Section: Asymptotic Stability Analysismentioning

confidence: 98%

Disturbance Observer and L2-Gain-Based State Error Feedback Linearization Control for the Quadruple-Tank Liquid-Level System

Meng

et al. 2020

Energies

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This paper proposes a fresh state error feedback linearization control method with disturbance observer (DOB) and L2 gain for a quadruple-tank liquid-level system. Firstly, in terms of the highly nonlinear and strong coupling characteristics of the quadruple-tank system, a state error feedback linearization technique is employed to design the controller to achieve liquid-level position control and tracking control. Secondly, DOB is purposed to estimate uncertain exogenous disturbances and applied to compensation control. Moreover, an L2-gain disturbance attenuation technology is designed to resolve one class of disturbance problem by uncertain parameter perturbation existing in the quadruple-tank liquid-level system. Finally, compared with the classical proportion integration differentiation (PID) and sliding mode control (SMC) methods, the extensive experimental results validate that the proposed strategy has good position control, tracking control, and disturbance rejection performances.

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“…Obviously, V is positive definite andV is negative definite, satisfying the Lyapunov stability theorem, so the desired equilibrium point x id is asymptotically stable [50][51][52][53].…”

Section: Asymptotic Stability Analysismentioning

confidence: 98%

Disturbance Observer and L2-Gain-Based State Error Feedback Linearization Control for the Quadruple-Tank Liquid-Level System

Meng

et al. 2020

Energies

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“…Unlike the fixed set-point of the conventional AC limiter of LL, the set-point of the modified LL strategy for DC microgrids is dynamically changed based on. 3 It should be noted that to prevent the windup of the voltage PI controller, the CIA scheme is used where the integration process of PI voltage controller is stopped when i L ref > I max . When the fault is cleared, the integrator is reset with a falling-edge signal.…”

Section: Proposed Fault Current Limitermentioning

confidence: 99%

“…However, many industrial applications such as aircraft, railway, irrigation, and telecommunication employ DC sources to supply DC loads. 3,4 DC microgrid as an important block of the future smart grid is an effective solution to alleviate the technical problems associated with conventional AC microgrid including need for frequency control, harmonic and reactive power issues, multiple stages of power conversion, and complicated synchronization. 5,6 Commonly, DC microgrids are managed using the hierarchical control structure (HCS) which provides the possibility of working in both grid-connected and islanded modes of operation.…”

Section: Introductionmentioning

confidence: 99%

Smooth reference modulation based protection of fault current limiting DC/DC converters

Noroozi

Sadeghkhani

2020

Measurement and Control

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Low voltage DC microgrids have been gaining great attention for the integration of renewable energy source and energy storage units, and electronic loads. DC microgrids are commonly controlled using the hierarchical control strategy (HCS) to provide flexible operation in both grid-connected and islanded modes. The HCS relies on proportional-integral (PI) controllers and employs the droop control strategy. To improve the fault ride-through of HCS based extra low voltage DC microgrids, this paper proposes a simple, accurate, and cost-effective current limiting strategy. The proposed control system based scheme modulates the current reference of the primary control level of HCS during an overcurrent condition using the smooth set point automatic adjustment with correction enabled technique. It properly protects the semiconductor switches of interface voltage-sourced DC-DC converters by accurate limiting their inductor currents. The main advantage of the proposed scheme is that it is implemented in the available PI controller based primary control level of the HCS. Also, it does not require the converter and load data. Several case studies performed in MATLAB/Simulink environment are presented to demonstrate the superior ability of this scheme for limiting fault current in different scenarios compared to conventional current limiters.

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“…Many nonlinear control techniques furthermore were applied to power electronic converters as well as microgrids such as sliding mode control, 20,21 passivity theory, 22,23 and feedback linearization 24,25 . In this paper, a Lyapunov‐based control technique is proposed to make stable responses for a hybrid DC/AC microgrid.…”

Section: Introductionmentioning

confidence: 99%

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

Souraki

Radmehr

Rezanejad

2020

Int Trans Electr Energ Syst

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Summary This paper proposes a new control strategy for enforcing a AC‐DC hybrid microgrid to attain stable responses in both steady state and dynamic operating conditions. The proposed controller is designed based on combining direct Lyapunov method and small signal linearization (SSL). The dynamic parts of converter control functions are achieved through providing the global asymptotical stability of the hybrid microgrid by using its total saved energy function. Then, the steady‐state components of the controller, unlike other existing Lyapunov‐based methods, are obtained according to SSL‐based mathematical terms as the main novelty of this paper. This novelty simultaneously provides several contributions within the proposed control technique structure as (a) the direct control of the PCC voltage frequency and DC‐link voltage errors, (b) the enhanced decoupling feature for DC/AC converter current, and (c) the direct control of the input voltage error for bidirectional DC/DC converter. Finally, comparative simulation results in MATLAB/Simulink software are presented to verify the superiority of proposed controller combined with SSL under AC and DC load variations, discharging/charging of storage unit, different grid power factors and AC loads shared among grid side and DC sources.

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Robust Nonlinear Adaptive Feedback Linearizing Decentralized Controller Design for Islanded DC Microgrids

Cited by 81 publications

References 27 publications

Disturbance Observer and L2-Gain-Based State Error Feedback Linearization Control for the Quadruple-Tank Liquid-Level System

Disturbance Observer and L2-Gain-Based State Error Feedback Linearization Control for the Quadruple-Tank Liquid-Level System

Smooth reference modulation based protection of fault current limiting DC/DC converters

Lypunov theory combined with small signal linearization for regulated operation of a hybridDC/ACmicrogrid

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