Model Predictive Control of Wind Energy Conversion Systems

Yaramasu, Venkata; Wu, Bin

doi:10.1002/9781119082989

Cited by 216 publications

(217 citation statements)

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“…Because the sampling time is sufficiently small, and the sampling frequency is much higher than the fundamental frequency, no extrapolation is considered for this study [38]. Instead, the simple one step method was used, which selects the switching state that minimizes the error at the (k + 1) instant and applies it at the kth instant.…”

Section: Bidirectional Dc-dc Converter In Discrete Time Domainmentioning

confidence: 99%

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

et al. 2018

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This paper applies model predictive control (MPC) for the power processing of an oscillating water column (OWC) wave energy conversion (WEC) system to achieve smooth power delivery to the grid. The particular air turbine design adopted in this study produces large power pulses ranging from 0 to 1 MW in magnitude, and thus, direct connection to the grid is practically impossible, especially in weak grid conditions. Therefore, energy storage is an essential element that should be integrated into this particular WEC system in order to absorb power pulses and thereby ensure smooth delivery of power to the grid. Taking into account the repetitive nature, duration, and magnitude of the power pulses, this study has chosen "supercapacitor" as the suitable energy storage technology. The supercapacitor energy storage (SCES) is integrated into the dc-link of the back-to-back power converter of the WEC system through a bidirectional dc-dc converter. In order to achieve the desired operation of this complex power converter arrangement, a finite control set MPC strategy is proposed in this paper. Performance of the proposed energy storage system (ESS) and control strategy are evaluated through computer simulations. Simulation results show that the proposed SCES system and the control strategy are able to achieve smooth power delivery to the grid amidst power pulses coming from the generator. exhale and inhale air streams through the open end of the chamber. Energy of the air stream is then converted into electricity with the aid of a turbine coupled generator. The commonly used turbines are bidirectional which extract energy from both the inhale and exhale streams.The Australian maritime college, in collaboration with the Wave Swell Energy Ltd., has developed a new OWC air turbine technology, which has been recognized as an efficient and simple design compared with many other OWC technologies [6,7]. This particular configuration has passive, non-return air flow valves built into its chamber, which activate during the exhale stage and equalize the pressure inside the chamber to the atmosphere, which allows the rising water column to reach its maximum height. This creates a higher differential pressure during the inhale stage resulting in high velocity air stream through the turbine. Since this particular air turbine extracts energy only during the inhale stage, the output power inherently becomes discrete pulses. These large and discrete power pulses create major operational issues, such as frequency deviations, voltage sags/swells, and instabilities if delivered to the grid without smoothing. Therefore, energy storage is an essential feature that should be incorporated into the power converter of the WEC system. Nevertheless, in contrast to wind energy or tidal energy turbines, where the rotational speed should be changed according to the wind speed or tidal flow speed, the unidirectional air-turbine used in this study does not necessarily require variable speed operation. Therefore, according to [8], the turbine speed can be ...

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Section: Bidirectional Dc-dc Converter In Discrete Time Domainmentioning

confidence: 99%

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

et al. 2018

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“…Thus the predictive control can be achieved. Yaramasu et al discussed about the Model predictive control of wind energy conversion systems [23]. Experimental validation of a robust continuous nonlinear model predictive control based gridinterlinked photovoltaic inverter was reported by Errouissi et al [24].…”

Section: Introductionmentioning

confidence: 99%

A Computational Analysis of Interfacing Converters with Advanced Control Methodologies for Microgrid Application

Panda

Ghosh

2020

Technol Econ Smart Grids Sustain Energy

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Power electronics converter and inverter systems for microgrid operations are always stochastic. When the system is operating in grid-tied mode, the attached load is not constant, so the current which drawn from the DC grid also varies leads to a voltage drop and that causes steady-state error in between the actual and desired output voltage in microgrid. DC-DC bidirectional converters are widely used in microgrid application that facilitates bidirectional energy convertion which having boost mode operation in one direction and bucking mode in other operation. The Interfacing converter is controlled by using the Maximum Power Point Tracking (MPPT) control technique for obtaining maximum power during different atmospheric conditions. In this work, a Model Predictive Control (MPC) strategy is proposed which having an improved cost function, single prediction horizon, and an observer to keep tracking the output voltage. Here, MPC is proposed for cumulative control in between the DC grid side converters and AC grid side inverter, and for improving the power quality and reliability of the utility grid. Both continuous time and discrete time domain models are formed for the whole system for applying different control strategies. Along with MPC, the system has been controlled by using other controllers like as PI controller, Sliding Mode Controller (SMC). Luenberger observer is used to check the DC grid voltage when disturbances are implemented. Here, all the computational results are compared for justifying and validate a better controlling method for microgrid application. These kind of work is first time reported in this manuscript.

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“…Script principal para simulação no tempo a partir das funções fsolve e ode15i *** Parte 3 *** Comportamento dinâmico do SCIG 0.75 MW. Os parâmetros deste aerogerador podem ser encontrados em Yaramasu e Wu (2017). Perturbação: perda de duas linhas de transmissão durante 500 ms.…”

Section: D3 Implementação Em Matlab ®unclassified

“…Os parâmetros referentes a cada tipo de máquina são típicos de aerogeradores comerciais. Mais detalhes podem ser encontrados em Yaramasu e Wu (2017). Para o cálculo da constante de inércia e dos valores por unidade, foi adotada a potência aparente base de 3 MVA.…”

Section: Comentários Finaisunclassified

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Avaliação da estabilidade de aerogeradores via método direto

Sohn¹

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Palavras-chave: Aerogerador. Estabilidade de velocidade. Fonte alternativa. Função energia. Limite operacional. LVRT. Método direto. PEBS. xiv xv Abstract A. P. Sohn. Stability assessment of wind turbines via direct method. 138 f. Tese de doutorado, Universidade de São Paulo, São Carlos, 2019.This thesis gives a step forward in the direction of reviewing the problem of transient stability and the theory of PEBS method to include models of renewable power plants and their operational limits. The formulation of direct methods with constraint is accomplished by exploring the theory of constrained dynamic systems and the concept of constrained stability region. In particular, the speed stability of the main wind turbine configurations equipped with an induction generator is analyzed, considering the low voltage ride-through requirement, or LVRT curve, as a constraint to the model. An augmented auxiliary dynamical system is developed to represent the time-dependent LVRT constraint as an equivalent time invariant constraint written in terms of an auxiliary state variable. This auxiliary system has its unconstrained stability region equals to the constrained stability region of the constrained dynamic system. The models are described in the form of algebraic and differential equations. The problem of speed stability and the problem of disconnection of wind turbines due to voltage limits violation are investigated via analysis of stability region of the post-fault equilibrium point and critical clearing times obtained for several perturbations. The results show that: i) for different operational limits and for different parameters of the induction machine, the stability regions for a given operating point can be significantly different, ii) in most cases, the violation of the LVRT curve occurs before the speed instability, which reveals the importance of include operational limits in transient stability analysis and in the formulation of direct methods and iii) in most cases, the developed energy functions to evaluate the problem of speed stability and the problem of voltage limits violation, are generally capable of making good estimates of critical clearing times. The developed studies about the transient stability assessment of different models of wind turbines via direct method contribute with applications that can be used in real-time security assessments of power systems that contemplate renewable power plants and their operational limits.

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Model Predictive Control of Wind Energy Conversion Systems

Cited by 216 publications

References 0 publications

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

Grid Integration and Power Smoothing of an Oscillating Water Column Wave Energy Converter

A Computational Analysis of Interfacing Converters with Advanced Control Methodologies for Microgrid Application

Avaliação da estabilidade de aerogeradores via método direto

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