Robust Feedback Linearizing Control With Sliding Mode Compensation for a Grid-Connected Photovoltaic Inverter System Under Unbalanced Grid Voltages

Merabet, Adel; Labib, Labib; Ghias, Amer M. Y. M.; Ghenaï, Chaouki; Salameh, Tareq

doi:10.1109/jphotov.2017.2667724

Cited by 73 publications

(33 citation statements)

References 15 publications

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“…In [11], a feedback linearizing control (FLC) with sliding mode LVRT scheme for a PV system is suggested. The proposed control scheme contains normal and abnormal conditions.…”

Section: Lvrt Control Strategies For Pv Systemsmentioning

confidence: 99%

“…Therefore, power and energy engineers everywhere are pondering the challenges of operation of PV power station under abnormal conditions, as it is the most way to improve the power quality, stability and reliability of utility grid with the high penetration of the PV systems [10]. To achieve the stable operation and appropriate integration, it is required for PV systems to provide a low-voltage ride-through (LVRT) capability and maintain grid functionality during fault conditions [11]. Even though many studies have been done to handle the challenging problems of supporting utility grid during abnormal conditions, there appears to be an absence of a comprehensive study on LVRT methods in PV systems.…”

Section: Introductionmentioning

confidence: 99%

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Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

Kamil¹,

Said²,

Mustafa³

et al. 2019

IJECE

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With the innovative progresses in power electronics in recent years, photovoltaic (PV) systems emerged as one of the promising sources for electricity generation at the distribution network. Nonetheless, connection of PV power plants to the utility grid under abnormal conditions has become a significant issue and novel grid codes should be recommend. The low-voltage ride-through (LVRT) capability is one of the challenges faced by the integration of PV power stations into electrical grid under abnormal conditions. This work firstly provides a discussion on recent control schemes for PV power plants to enhance the LVRT capabilities. Next, a control scheme for a three-phase four-leg grid-connected PV inverter under unbalanced grid fault conditions using synchronous reference frame proportional integral (SRFPI) controller is proposed. Simulation studies are performed to investigate the influence of the control strategy on the PV inverter.

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“…In [11], a feedback linearizing control (FLC) with sliding mode LVRT scheme for a PV system is suggested. The proposed control scheme contains normal and abnormal conditions.…”

Section: Lvrt Control Strategies For Pv Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

Kamil¹,

Said²,

Mustafa³

et al. 2019

IJECE

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“…Under normal operation, the EMS gets the real and reactive power demands P ∗ ( t ) and Q ∗ ( t ) from the grid operator (GO). If a voltage sag is detected, P ∗ ( t ) is obtained from the GO, while Q ∗ ( t ) is set equal to the fault reactive power Q f a u l t ( t ), which is calculated locally by the EMS as follows:

Q_{f a u l t} false(t false) = ({, \begin{matrix} array 0, & array if V_{s a g} (t) \leq 0.1 \\ array 2 V_{s a g} (t) Q^{m a x}, & array if 0.1 < V_{s a g} (t) \leq 0.5 \\ array Q^{m a x}, & array if V_{s a g} (t) > 0.5 . \end{matrix}),

where Q m a x is the maximum reactive power set to be delivered by the hybrid PV‐FC source and V s a g ( t ) is defined as

V_{s a g} false(t false) = true[1 - \frac{m i n false(V_{g r i d, a}^{r m s} false(t false), V_{g r i d, b}^{r m s} false(t false), V_{g r i d, c}^{r m s} false(t false) false)}{V_{b a s e}} true] .

At the same time, the EMS also calculates a scaling factor k s c to curtail the active power delivered to the grid and avoid overcurrents due to voltage sag as

k_{s c} = ({, \begin{matrix} array 1 - \frac{k_{s c 1}}{m a x (i_{a} (t), i_{b} (t), i_{c} (t))}, \end{matrix})

…”

Section: Energy Management Schemementioning

confidence: 99%

“…where Q max is the maximum reactive power set to be delivered by the hybrid PV-FC source and V sag (t) is defined as 21,25 V sag (t) =…”

Section: Energy Management Schemementioning

confidence: 99%

“…Performance and convergence rate constraints are imposed on the design to enhance transient responses and dynamic behavior. Parameter selection guidelines are also given. During asymmetrical voltage sags, real power delivered to the grid is kept constant, and the injected currents are kept sinusoidal without requiring a PLL or the PN sequence components of unbalanced voltages or currents that are generally employed under unbalanced conditions and to keep real power injection constant during grid support . This leads to a significant reduction in computational complexity and design requirements of the control strategy.…”

Section: Introductionmentioning

confidence: 99%

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A novel low-voltage ride-through capable energy management scheme for a grid-connected hybrid photovoltaic-fuel cell power source

Sabir

2018

Int Trans Electr Energ Syst

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Summary A novel low‐voltage ride‐through capable energy management control system is proposed for a grid‐connected hybrid photovoltaic‐fuel cell power source. The scheme is designed to enable the hybrid power source to follow a power demand from the grid operator. Additionally, the system is able to ride through both symmetrical and asymmetrical voltage sags while providing active and reactive power support to the grid. The injected active power is kept constant during asymmetrical voltage sags without requiring a phase locked loop or positive‐negative sequence extraction, thus lowering the computational complexity and design requirements of the control system. Several test cases are simulated using the SimPowerSystems toolbox of MATLAB/Simulink computing environment to demonstrate effectiveness of the proposed strategy both under normal and voltage sag conditions. Results of the control algorithm's digital implementation on a low‐cost microcontroller are also presented.

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Active disturbance rejection controller design for harmonic suppression in MPC optimal control based on harmonic state space modeling

Jican

Liu

Wang

2023

Circuit Theory & Apps

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SummaryThis paper proposes a harmonic suppression strategy for photovoltaic‐voltage source converters (PV‐VSC). The proposed method utilizes a harmonic state space (HSS) model‐combine model predictive control (MPC) algorithm, which provides a comprehensive representation of the global characteristics of AC/DC harmonic coupling impedance in photovoltaic systems. The HSS‐based converter model operates as a linear time‐varying periodic system, which allows for the implementation of MPC to optimize the HSS equation. This optimization yields voltage increments across various harmonic orders, providing feedforward compensation for the current controller. By incorporating feedback signals into the current control, harmonic compensation is achieved, resulting in improved power quality. Furthermore, a decoupled proportional resonance‐linear adaptive disturbance rejection control (PR‐LADRC) is employed to effectively mitigate steady‐state errors and decrease total harmonic distortion in the presence of DC‐side disturbances. This is accomplished by decoupling the disturbance observer from the controller and integrating the increment feedback signal derived from the MPC‐HSS. Finally, the efficacy of the proposed method and the analysis results are corroborated through numerical simulations.

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Robust Feedback Linearizing Control With Sliding Mode Compensation for a Grid-Connected Photovoltaic Inverter System Under Unbalanced Grid Voltages

Cited by 73 publications

References 15 publications

Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

Low-voltage ride-through for a three-phase four-leg photovoltaic system using SRFPI control strategy

A novel low-voltage ride-through capable energy management scheme for a grid-connected hybrid photovoltaic-fuel cell power source

Active disturbance rejection controller design for harmonic suppression in MPC optimal control based on harmonic state space modeling

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