New Control Strategy for Three-Phase Grid-Connected LCL Inverters without a Phase-Locked Loop

Zhou, Lin; Yang, Ming; Liu, Qiang; Guo, Ke

doi:10.6113/jpe.2013.13.3.487

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…For comparison, a grid-connected inverter with LCL filter and active damping as proposed in [64] was adopted. The control loop of the inverter adopting the grid-side current control with a feedback of the capacitor current for the active damping LCL filter is shown in Figure 9, where 𝑃 𝐿 represents the third-order filter and 𝐾 𝑝𝑤𝑚 represents the gain of the fullbridge three-phase inverter [65], which can be approximated by Equation 29:…”

Section: Comparison Of Some Control Strategiesmentioning

confidence: 99%

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: Comparison Of Some Control Strategiesmentioning

confidence: 99%

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

et al. 2022

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“…However, active damping is more well known than passive damping because no additional power loss occurs [3]- [10]. Among the various active damping solutions, capacitor-current-feedback active damping is selected in this study because of its effectiveness, simple implementation, and extensive application [6]- [10]. Capacitor-current-feedback active damping is equivalent to a virtual resistor connected in parallel with the filter capacitor [5].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the selection and design of the current controller is crucial. The stationary α-β frame is selected in this study to prevent the inconvenient decoupling in the synchronous d-q frame [6]. To track the sinusoidal current reference and suppress the selected low-order current harmonics, the proportional plus multifrequency resonant (multi-resonant proportional plus resonant [PR]) controller has been used extensively [14]- [19].…”

Section: Introductionmentioning

confidence: 99%

Simplified Controller Design Method for Digitally Controlled LCL-Type PWM Converter with Multi-resonant Quasi-PR Controller and Capacitor-Current-Feedback Active Damping

Lyu¹,

Lin²

2014

Journal of Power Electronics

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To track the sinusoidal current under stationary frame and suppress the effects of low-order grid harmonics, the multi-resonant quasi-proportional plus resonant (PR) controller has been extensively used for digitally controlled LCL-type pulse-width modulation (PWM) converters with capacitor-current-feedback active damping. However, designing the controller is difficult because of its high order and large number of parameters. Moreover, the computation and PWM delays of the digitally controlled system significantly affect damping performance. In this study, the delay effect is analyzed by using the Nyquist diagrams and the system stability constraint condition can be obtained based on the Nyquist stability criterion. Moreover, impact analysis of the control parameters on the current loop performance, that is, steady-state error and stability margin, identifies that different control parameters play different decisive roles in current loop performance. Based on the analysis, a simplified controller design method based on the system specifications is proposed. Following the method, two design examples are given, and the experimental results verify the practicability and feasibility of the proposed design method.

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“…Photovoltaic power generation system usually adopts the mode that multiple inverters operate in parallel to conduct grid connection [1], so as to ensure the power generation efficiency of the photovoltaic power station. However, connecting a large number of inverter clusters to the power grid will cause the system to resonate, and then affecting the stability of the power system and the power quality of the power grid.…”

Section: Introductionmentioning

confidence: 99%

Research on Resonance Mechanism and Suppression Technology of Photovoltaic Cluster Inverter

Wan

Zhang

2018

Energies

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Photovoltaic cluster power generation can improve the power generation efficiency of photovoltaic power plants, but the photovoltaic cluster inverter will produce resonance after the grid, affecting the safe and stable operation of power systems. In order to ensure the reliability of power supply, the resonant generation mechanism of photovoltaic cluster system is studied in this paper, and the resonant characteristics are analyzed, the control strategy of RC-type global resonance suppression and Thyristor Switching RC (TSRC) circuit are proposed, to suppress the resonance of the photovoltaic cluster system. The effectiveness of the control method is verified through simulation and experiment. The experimental results show that the resonance can be effectively suppressed, and the photovoltaic cluster system can be safely and stably connected to the power grid to ensure the reliability of power supply.

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New Control Strategy for Three-Phase Grid-Connected LCL Inverters without a Phase-Locked Loop

Cited by 18 publications

References 19 publications

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

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

Simplified Controller Design Method for Digitally Controlled LCL-Type PWM Converter with Multi-resonant Quasi-PR Controller and Capacitor-Current-Feedback Active Damping

Research on Resonance Mechanism and Suppression Technology of Photovoltaic Cluster Inverter

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