Grid-Connected Shunt Active <i>LCL</i> Control via Continuous Sliding Modes

Alali, Mohamad Alaa Eddin; Shtessel, Yuri B.; Barbot, Jean–Pierre

doi:10.1109/tmech.2019.2896140

Cited by 25 publications

(27 citation statements)

References 18 publications

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“…where i * inva , u * ca and i * sha is the A-phase reference for inverter output current, the reference for filter capacitor voltage, and the reference for the SAPF grid-connected current (that is, harmonic command current), respectively. Those satisfy (5), and i * inva and u * ca can be written as…”

Section: Of 21mentioning

confidence: 99%

“…, u is the control law. From (5) to (8), the following can be derived (assuming the grid voltage is constant):…”

Section: Of 21mentioning

confidence: 99%

“…The sliding mode control (SMC) strategy has been applied in SAPF due to its good dynamic response, strong robustness, and good regulation performance in a wide operating condition. Various SMC methods for SAPF have been proposed [4,5]. Their robustness is always enhanced, and the steady-state accuracy is also highlighted.…”

Section: Introductionmentioning

confidence: 99%

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A Sliding Mode Control Strategy with Repetitive Sliding Surface for Shunt Active Power Filter with an LCLCL Filter

Gao

Zhang

et al. 2020

Energies

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This paper proposes a novel sliding mode control (SMC) scheme with a repetitive sliding surface for shunt active power filters (SAPF) to enhance the system robustness and eliminate harmonic current tracking errors. Traditional control schemes, such as PI control, repetitive control (RC), proportional resonance control (PR), improve the stability of the SAPF in the stable grid to a certain extent. However, the robustness of the SAPF control system has not been improved. In this paper, the SMC is applied to SAPF, and a sliding mode controller is constructed by using a linear sliding mode surface composed of the system state variables and a fast exponential power-reaching law, which can effectively enhance the system robustness. When the grid parameters change or external disturbances exist, sliding surface drift and sliding mode chattering will occur. Although fast-tracking of the harmonic current can still be achieved, it is difficult to accurately compensate AC harmonic current. Moreover, this may cause the harmonic current compensation error to be amplified. RC can achieve infinite gain at multiples of the fundamental frequency and can track inputs without static errors. In order to fully eliminate the harmonic current tracking error and effectively suppress the total harmonic distortion (THD) of the grid, the sliding mode surface was modified. An RC term of harmonic current error is introduced to the sliding mode surface, and a novel plugin-repetitive sliding mode control strategy (RCSMC) for SAPF is proposed. Finally, simulation and experiment results on the LCLCL-filter based SAPF show the effectiveness of the proposed control strategy.

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Section: Of 21mentioning

confidence: 99%

“…, u is the control law. From (5) to (8), the following can be derived (assuming the grid voltage is constant):…”

Section: Of 21mentioning

confidence: 99%

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A Sliding Mode Control Strategy with Repetitive Sliding Surface for Shunt Active Power Filter with an LCLCL Filter

Gao

Zhang

et al. 2020

Energies

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“…In the literature, the sliding mode controller is mostly applied to dc–dc converters like buck converter [26], boost converter [27], Luo converter [28] etc. Some researchers proposed the hysteresis and signum methods of sliding mode controller for the shunt active filter which controls only the reactive power [29, 30]. Here, the real power is also controlled using the hysteresis, relay and signum method and equivalent control method.…”

Section: Introductionmentioning

confidence: 99%

Sliding mode controller‐based voltage source inverter for power quality improvement in microgrid

Rajakumar

Kavitha

2020

IET Renewable Power Generation

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Development of control technologies facilitates the integration of renewable energy sources to the grid through power electronic converters. In this study, the inverter acts as shunt active power filter along with the power conversion operation. Various sliding mode control (SMC) techniques namely relay and signum method, hysteresis method and equivalent control method are implemented to control the real, and reactive power flow between Renewable Energy System (RES), load and grid using an inverter. To reduce the complexity, the control law (u eq) for equivalent control method is derived using a simple singlephase equivalent circuit of a three-phase voltage source inverter. In this study, the robustness is enhanced by choosing the integral sliding surface. These controllers are used to reduce the total harmonic distortion (THD) and to ensure unity power factor (PF) in the grid during balanced and unbalanced grid voltage conditions even in the existence of nonlinear loads. The SMC using equivalent control function outperforms the other methods in terms of chattering, THD and PF. To illustrate the effectiveness, three different modes are considered: (i) no RES power, (ii) insufficient RES power and (iii) excess RES power. The performance of controllers is validated by the simulation and experimental results.

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“…The sliding-mode tracking controller with the constant switching-frequency method has been recommended to control the output of the DC-to-AC inverter. In this situation, the consequent output-voltage makes a trade-off between linear and nonlinear loading [12]. The variable structure scheme combined with a Lyapunov candidate methodology is designed for gaining a robust response of an island microgrid.…”

Section: Introductionmentioning

confidence: 99%

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

Chang¹

2020

Sustainability

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This paper describes a robust feedback technique involving novel fixed-time-convergent sliding mode technology (NFTCSMT) using improved quantum particle swarm optimization (QPSO) to obtain high-performance renewable energy inverters. Customary SMT encounters long time convergence towards the origin and the influence of the dithering. The NFTCSMT can rapidly impel system-following movement to approach the sliding manifold and effectively accelerate the convergence speed to equilibrium states. However, the NFTCSMT cannot easily select the global optimum of the controller parameters subject to large parameter changes and nonlinear interventions, leading to the dither phenomenon/steady-state error still being caused. The dither inflicts decreased control accuracy, high voltage harmonics, major harm in relation to switching components, and great thermal losses in power electronic converters. The improved QPSO including the unique property of a random compression/expansion factor is used to find optimal parameters of the NFTCSMT in practical applications, for the reason that it importantly mitigates the dither and amends convergent speed as well as guaranteeing global convergence. The presented alliance amid NFTCSMT and improved QPSO achieves faster response time and singularityless, and also yields high-accuracy tracking and dither attenuation. The robust stability using Lyapunov theorem of the suggested system has provided precise mathematical derivations. Simulations show that the suggested controller offers less than 0.1% voltage THD (total harmonic distortion) which exceeds IEEE standard 519 under heavily distorted rectifier loads, and less than 10% voltage dip which surpasses IEEE standard 1159 during step load transients. Experimental tests of an algorithmically controlled laboratory prototype (1 kW, 110 Vrms/60 Hz) of a renewable energy inverter (REI) based on digital signal processing manifest less than 0.05% voltage THD in the face of great inductor-capacitor alterations, and less than 10% voltage dip in the face of transient load scenarios.

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Grid-Connected Shunt Active LCL Control via Continuous Sliding Modes

Cited by 25 publications

References 18 publications

A Sliding Mode Control Strategy with Repetitive Sliding Surface for Shunt Active Power Filter with an LCLCL Filter

A Sliding Mode Control Strategy with Repetitive Sliding Surface for Shunt Active Power Filter with an LCLCL Filter

Sliding mode controller‐based voltage source inverter for power quality improvement in microgrid

A Novel Fixed-Time-Convergent Sliding Mode Technology Using Improved Quantum Particle Swarm Optimization for Renewable Energy Inverters

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