Investigation of reducing the influence of digital control delay to LCL-type grid-connected inverter

Zhao, Guoshu; Ma, Junyang; Huang, Liuliu; Tang, Yuting

doi:10.1109/ecce.2016.7855219

Cited by 5 publications

(7 citation statements)

References 5 publications

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“…An adaptive uncertainty observer was employed to compensate for time delay as well as parameter mismatch. However, the observer employed was sensitive to changes in system parameters, in addition to having inherent modeling error and a large prediction error [23].In [24], the authors adopted the DB controller designed in [25] and proposed a control method to mitigate fast voltage disturbances. The study employed a PI voltage control in the outer loop.…”

Section: ) State-variable Derivation (Pole Placement Technique)mentioning

confidence: 99%

“…In [39], the authors extended the previous work presented in [38] by using an LCL filter instead of the L filter and modeled the system with an arbitrary control delay. However, the observer employed had inherent modeling error and large prediction error [23].…”

Section: ) Hybrid Dbc Design Approachmentioning

confidence: 99%

“…This study reported good controller tracking with a deadbeat response. However, an observer may be sensitive to changes in the system parameters in addition to having inherent modeling error and a large prediction error [23]. In [48], the authors proposed a robust line-voltage sensorless control and the synchronization of the DB controller using the two-stepsahead approach.…”

Section: ) Hybrid Dbc Design Approachmentioning

confidence: 99%

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Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

et al. 2022

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Discrete-time dynamic systems demonstrate quite exciting possibilities from the perspective of control as compared with the continuous-time counterpart. Interesting properties of discrete-time dynamic systems include the possibility to algebraically determine previously unknown system parameters by simply measuring the present inputs and outputs of the system. Additionally, achieving a finite settling time with zero steady-state error is only achievable in discrete-time dynamic systems. Deadbeat current control (DBCC) has been used to achieve a finite settling time, especially in grid-connected inverter applications. However, there is no comprehensive study on reviewing or evaluating existing control approaches, to the authors' best knowledge. This paper systematically examined the existing methods by paying attention to four key research issues: 1) research evidences indicating the adoption of DBCC in grid-connected inverter applications (GCIAs), 2) the types of deadbeat control approaches adopted in GCIAs, 3) the best approach in terms of stability especially regarding grid-impedance variation, and 4) the barriers that might prevent the wide adoption of DBCC in GCIAs. Finally, this paper presents a hypothesis based on the simulated results on which approach is superior at present to give readers a direction for further research classification on deadbeat control.INDEX TERMS Deadbeat control, grid-connected inverter, current control, renewable energy sources.

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Section: ) State-variable Derivation (Pole Placement Technique)mentioning

confidence: 99%

Section: ) Hybrid Dbc Design Approachmentioning

confidence: 99%

Section: ) Hybrid Dbc Design Approachmentioning

confidence: 99%

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Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

et al. 2022

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“…Moreover, adding more delays will further impose more bandwidth limitation on the current controller. Widening the stable region with delay reduction has been adopted using additional active damping terms to the current control loop (multi-loop) using a capacitor current feedback [12,15,32], capacitor voltage feedforward [26,33], and grid voltage feed-forward [13,[34][35][36][37]. Different from what the other of the research employed, the authors in [37] employed a multi-resonant component-based weighted feed-forward scheme, where multi-quasi resonant components are added to extract the fundamental and the objective harmonics.…”

Section: Issues With the Model-free Time-delay Compensation Techniquesmentioning

confidence: 99%

“…This technique is divided further into two: the inverter-side active damping and the grid-side active damping techniques. In the inverter-side active damping technique, single, double or multi-loop feedback or feed-forward current or voltage state variables are used to achieve excellent damping and mitigate time-delay in the control loop, as reported in [12][13][14][15]. State variable measurements are carried out on the filter capacitor or inductor at the Inverter-side, as shown in Figure 2.…”

Section: Damping Techniquesmentioning

confidence: 99%

A comprehensive review on time‐delay compensation techniques for grid‐connected inverters

Elhassan

Zulkifli

Pathan

et al. 2021

IET Renewable Power Gen

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The control of grid‐connected inverters is recently executed with digital microprocessors due to the advances in digital signal processing technology. However, the digital realisation has a drawback of the phase lag induced by the time‐delay. This phase lag challenges the stability and robustness of the controller of the inverters. In view of the challenge, this paper presents a comprehensive review of time‐delay compensation techniques employed in both model‐free (MF), and model‐based (MB) controls of an inverter in grid connection. MF techniques mainly use proportional‐integral, and proportional resonance controllers with some techniques to reduce time‐delay. Meanwhile, for MB, this paper discusses the commonly used control techniques, which are the Smith predictor, modified Smith predictor, deadbeat controller and model predictive controller. Several related techniques from the literature that have been adopted to mitigate the delays are tabulated comprehensively, and critical issues regarding the MF and MB techniques are also discussed. Finally, this paper presents a hypothesis on which technique is superior at present and suggests a hybrid technique from the MF and MB techniques to give readers a direction for further research.

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Stability Analysis and Controller Design of MMC Considering Control Delay

Kong

Wang

Praisuwanna

et al. 2020

2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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Investigation of reducing the influence of digital control delay to LCL-type grid-connected inverter

Cited by 5 publications

References 5 publications

Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

Deadbeat Current Control in Grid-Connected Inverters: A Comprehensive Discussion

A comprehensive review on time‐delay compensation techniques for grid‐connected inverters

Stability Analysis and Controller Design of MMC Considering Control Delay

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