Observer-based nonlinear control of power system using sliding mode control strategy

Ouassaid, Mohammed; Maâroufi, Mohamed; Cherkaoui, Mohamed

doi:10.1016/j.epsr.2011.10.014

Cited by 68 publications

(47 citation statements)

References 17 publications

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“…where u eq (t) is an equivalent control-input that determines the system's behavior on the sliding surface and u n (t) is a non-linear switching input, which drives the state to the sliding surface and maintains the state on the sliding surface in the presence of the parameter variations and disturbances [31,40]. The equivalent control-input is obtained from the invariance condition and is given by the following condition S 1 = 0 and…”

Section: Control Of Generator Speedmentioning

confidence: 99%

Sliding Mode Control of Induction Generator Wind Turbine Connected to the Grid

Ouassaid

Elyaalaoui

Cherkaoui

2016

Advances and Applications in Nonlinear Control Systems

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Conventional fossil fuels such as coal, oil and natural gas are being reduced and become more and more a source of serious undesirable effects on the environment. Wind power is playing a major role in the effort to augment the share of renewable energy sources in the world energy mix with a continuously increasing penetration into the grid. Wind turbine generators can be divided into two basic categories: fixed speed and variable speed. Variable-speed wind energy systems are presently favored than fixed-speed wind turbines thanks to their higher wind power extraction, improved efficiency, reactive power support and voltage control. This study addresses the problem of control of Wind Energy Conversion System (WECS) in variable speed. To this end, two simultaneous control objectives, namely the maximization of the energy conversion efficiency based on Squirrel Cage Induction Generator (SCIG) wind turbine and the regulation of the active and reactive power feed to the grid, to guarantee Unit Power Factor (UPF), have been established. To deal with the complexity and nonlinearity of the system, the sliding mode control is adopted. Indeed, this technique provides an efficient tool for controller design and presents attractive features such as robustness to parametric uncertainties of the different components of the system. In this way, sliding-mode control laws are developed using Lyapunov stability analysis, to guarantee the reaching and sustaining of sliding mode and stability of the system control. Evaluation of the reliability and performance of the proposed sliding mode control approach has been established on a 3MW three-blade wind turbine. Simulation results demonstrate that the proposed control strategy is effective in terms of MPPT control strategy, active and reactive power tracking trajectories and robustness against system parameter variations.

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Section: Control Of Generator Speedmentioning

confidence: 99%

Sliding Mode Control of Induction Generator Wind Turbine Connected to the Grid

Ouassaid

Elyaalaoui

Cherkaoui

2016

Advances and Applications in Nonlinear Control Systems

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“…As a result, the estimation problem of damper currents of synchronous generator arises. For this purpose, a nonlinear observer for damper currents is developed, based on the sliding mode technique (Ouassaid et al 2012).…”

Section: Sliding Mode Controlmentioning

confidence: 99%

Transient Stability Enhancement of Power Systems Using Observer-Based Sliding Mode Control

Ouassaid

Maâroufi

Cherkaoui

2014

Advances and Applications in Sliding Mode Control Systems

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The high complexity and nonlinearity of power systems, together with their almost continuously time-varying nature, have presented a big challenge for control engineers, for decades. The disadvantages of the linear controllers/models, such as being dependent on the operating condition, sensibility to the disturbance such as parametric variations or faults can be overcome by using appropriate nonlinear control techniques. Sliding-mode control technique has been extensively used when a robust control scheme is required. This chapter presents the transient stabilization with voltage regulation analysis of a synchronous power generator driven by steam turbine and connected to an infinite bus. The aim is to obtain high performance for the terminal voltage and the rotor speed simultaneously under a large sudden fault and a wide range of operating conditions. The methodology adopted is based on sliding mode control technique. First, a nonlinear sliding mode observer for the synchronous machine damper currents is proposed. Next, the control laws of the complete ninth order model of a power system, which takes into account the stator dynamics as well as the damper effects, are developed. They are shown to be asymptotically stable in the context of Lyapunov theory. Finally, the effectiveness of the proposed combined observer-controller for the transient stabilization and voltage regulation is demonstrated. Nomenculture

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“…One of the most important examples of interconnected systems is the interconnected power system or multimachine power system which consists of multi power generators connected via a power distribution network [5]. Naturally, the model of the power system is inherently nonlinear containing disturbances and uncertainties [6,5]. As a consequence, the transient stability of power systems is a big challenge.…”

Section: Introductionmentioning

confidence: 99%

“…Transient stability is the ability of a power system to maintain the dynamic behaviour of the system at the steady state to meet different load demands or follow any significant unpredictable behaviour [7,6]. Therefore, large numbers of researchers have developed control techniques to enhance the reliability of the power supply [8,9].…”

Section: Introductionmentioning

confidence: 99%

Robust sliding‐mode observers for large‐scale systems with application to a multimachine power system

Mohamed

Yan

Spurgeon³

et al. 2017

IET Control Theory & Applications

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In this paper, a class of interconnected systems with structured and unstructured uncertainties is considered where the known interconnections and uncertain interconnections are nonlinear. The bounds on the uncertainties are employed in the observer design to enhance the robustness when the structure of the uncertainties is available for design. Under the condition that the structure distribution matrices of the uncertainties are known, a robust sliding mode observer is designed and a set of sufficient conditions is developed to guarantee that the error dynamics are asymptotically stable. In the case that the structure of uncertainties is unknown, an ultimately bounded approximate observer is developed to estimate the system states using sliding mode techniques. The results obtained are applied to a multimachine power system, and simulation for a two machine power system is presented to demonstrate the feasibility and effectiveness of the developed methods.

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Observer-based nonlinear control of power system using sliding mode control strategy

Cited by 68 publications

References 17 publications

Sliding Mode Control of Induction Generator Wind Turbine Connected to the Grid

Sliding Mode Control of Induction Generator Wind Turbine Connected to the Grid

Transient Stability Enhancement of Power Systems Using Observer-Based Sliding Mode Control

Robust sliding‐mode observers for large‐scale systems with application to a multimachine power system

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