A novel dual closed-loop control scheme based on repetitive control for grid-connected inverters with an LCL filter

Gao, Yunguang; Jiang, Fayang; Song, Jiancheng; Zheng, Ling; Tian, Fei-Yan; Geng, Pulong

doi:10.1016/j.isatra.2018.01.029

Cited by 41 publications

(16 citation statements)

References 24 publications

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“…The repetitive controller transfer function G RC (s) can achieve the best harmonic compensation by reasonably adding a compensator C(z) when the discrete implementation. According to [24], the compensator C(z) is composed of three parts: proportional gain k r , phase lead z k , and filter S(z). For the system parameters in this paper, the compensator is designed as [24]:…”

Section: Plug-in Repetitive Sliding Mode Controller Designmentioning

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: Plug-in Repetitive Sliding Mode Controller Designmentioning

confidence: 99%

“…According to [24], the compensator C(z) is composed of three parts: proportional gain k r , phase lead z k , and filter S(z). For the system parameters in this paper, the compensator is designed as [24]:…”

Section: Plug-in Repetitive Sliding Mode Controller Designmentioning

confidence: 99%

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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“…Although the influence of the grid voltage on the incoming current is eliminated, the complexity of the system is increased [3]. The work in [4] proposed a closed-loop control method for inner loop proportional control and external loop network side inductor current quasi-ratio resonance control. Although this method can effectively suppress static error, it lacks real-time performance; especially the network voltage is heavily distorted.…”

Section: Motivation and Incitementmentioning

confidence: 99%

Optimal Current Balance Control of Three-Level Inverter under Grid Voltage Unbalance: An Adaptive Dynamic Programming Approach

Wang

Wan

2019

Energies

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When the grid voltage is unbalanced, the positive and negative sequence components in the grid voltage cause grid current to be disordered. Under current balance control, proportional integral (PI) closed-loop control will increase the grid currents instantaneously, which affects the safety and reliability of the inverter operation, and PI parameters are difficult to select without the complete system mathematical model. This paper introduces an adaptive dynamic programming (ADP) approach to solve this problem. The best state feedback controller for the system is obtained by driving the ADP by the value iteration ( V I ) algorithm without the need for an accurate mathematical model. In the simulations, the ADP approach can improve the dynamic performance of the system, the current increase can be suppressed when the grid voltage is unbalanced, and the harmonic rate of output currents is reduced.

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“…Actually, there is a control delay in the digital control together with a zero-order hold (ZOH) characteristic [22]. If a discrete system has to be modelled as a continuous system, the sampler needs to be considered.…”

Section: Modelling Of the Single-phase Grid-tied H6 Invertermentioning

confidence: 99%

“…S e jw = N s e jw e [jθ s (e jw )] P 0 e jw = N p e jw e θ p (e jw ) (22) where N s e jw and N p e jw are the amplitude characteristics of S (z) and P 0 (z), respectively. θ s e jw and θ p e jw are their phase characteristics, respectively.…”

Section: Pmqr-type Rc Scheme Designmentioning

confidence: 99%

Analysis and Design of A PMQR-Type Repetitive Control Scheme for Grid-Connected H6 Inverters

Yang

Liu

et al. 2019

Applied Sciences

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There exist several challenges in the implementation of proportional multiple quasi-resonant (PMQR) control strategies in single-phase grid-connected H6 inverters, such as high computational costs and design complexity. To overcome these challenges, this paper proposes a proportional multiple quasi-resonant (PMQR)-type repetitive control (PMQR-type RC) scheme for single-phase grid-connected H6 inverters. In the control scheme, a repetitive controller and a proportional controller run in parallel. The repetitive controller is to improve the steady-state harmonics compensation ability, while the proportional controller can enhance the transient performance of the system. Both theoretical stability analysis and detailed design steps regarding the proposed control scheme are introduced. Finally, comparison results on a typical single-phase grid-connected H6 inverter with LC filter under a variety of control methods verify the capability of suppressing harmonics and the robust performance of the proposed control strategy against grid disturbances.

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A novel dual closed-loop control scheme based on repetitive control for grid-connected inverters with an LCL filter

Cited by 41 publications

References 24 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

Optimal Current Balance Control of Three-Level Inverter under Grid Voltage Unbalance: An Adaptive Dynamic Programming Approach

Analysis and Design of A PMQR-Type Repetitive Control Scheme for Grid-Connected H6 Inverters

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