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Modeling and Control Parameters Design for Grid-connected Inverter System Considering the Effect of PLL and Grid Impedance
2019
IEEE Access
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Therefore, the loop composed of the grid impedance and PLL can easily lead to the oscillation of the grid-connected inverter system under weak grid condition. ...
To suppress the oscillation, a control parameters design method of the grid-connected inverter is proposed. ...
loop on the stability of grid-connected inverter system is analyzed; and the control parameters design method of the grid-connected inverter considering interaction between PLL and current control loop ...
doi:10.1109/access.2019.2950933
fatcat:tfxt2amj3vbzjcwki6yvl4kssy
Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid
2019
Energies
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And the total harmonic distortion of steady-state grid-connected current is reduced to less than 2%. Furthermore, a specific design method of control parameters is depicted. ...
And the qq channel impedance of the inverter presents as a negative incremental resistance with the PLL effect. ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/en12132457
fatcat:3uu2ccmttfg2bnoojuspia3ksu
New analysis on two‐variable converter impedance model in grid‐connected systems
2021
IET Renewable Power Generation
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This paper presents an in-depth analysis for the two-variable impedance model of a gridconnected system. ...
The proposed method not only analyzes the system stability at different operating points, but also enables the controller design to ensure system stability. ...
ACKNOWLEDGEMENTS This work was supported in part by the National Nature Science Foundation Key Project of China under Grant 51937001 and in by the Nature Science Foundation Key Project of Chongqing in ...
doi:10.1049/rpg2.12265
fatcat:qypm7oj5vjfvna7f7oxwoc3f2e
Practical Implementation of Adaptive SRF-PLL for Three-Phase Inverters Based on Sensitivity Function and Real-Time Grid-Impedance Measurements
2020
Energies
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High control bandwidth of the PLL makes the system sensitive to impedance-based stability issues when the inverter is connected to a weak grid that has high impedance. ...
The present work proposes method for adaptive control of the PLL based on the real-time measurements of the grid impedance, applying pseudo-random binary sequence (PRBS) injections. ...
The multivariable small-signal model of such a three-phase grid-connected inverter in the dq domain has already been introduced in [35] , so the present paper only considers the PLL and its optimal control ...
doi:10.3390/en13051173
fatcat:74hgtencurc4fajinjmj5i7hyi
Modeling and Analysis of Resonance in LCL-Type Grid-Connected Inverters under Different Control Schemes
2017
Energies
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To analyze the existing resonance phenomena due to the variation of grid impedances, the sequence impedance models of LCL-type grid-connected three-phase inverters under different control schemes are presented ...
As a basic building block in power systems, the three-phase voltage-source inverter (VSI) connects the distributed energy to the grid. ...
Acknowledgments: This work was from the project Research on Integrated Evaluation of the Impact of Connected Distributed Generation on Heilongjiang Distributed Networks, supported by State Grid. ...
doi:10.3390/en10010104
fatcat:ikc6y52uyjgd3bjbdwmobm4lhy
Phase-Locked Loop Research of Grid-Connected Inverter Based on Impedance Analysis
2018
Energies
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The paper establishes the impedance model considering the DSOGI-PLL structure of the inductor-capacitor-inductor-type (LCL-type) inverter grid-connected system adopting current control measured from the ...
Meanwhile, analyzing the influence of parameters on impedance according to the impedance model established preferable design parameters. ...
Conflicts of Interest: The authors declare no conflict of interest. ...
doi:10.3390/en11113077
fatcat:35hbfqqz4jdc7cif73mxrk5txi
Robustness Improvement of Single-Phase Inverters under Weak Grid Cases by Adding Grid Current Feedforward in Delay-Based Phase-Locked Loop
2020
IEEE Access
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At first, by modeling the inverter output impedance and considering the frequency coupling effect, the stability of the typical delay-based PLL has been analyzed and the reason for the performance degradation ...
The selection of control parameters has been emphasized for maintaining the high robustness. ...
(a) LCL filter; (b) delay-based PLL; (c) current control.
FIGURE 2 . 2 Impedance modelings of the grid-connected system. (a) typical model; (b) revised model considering the PLL. ...
doi:10.1109/access.2020.2995624
fatcat:3nbgsvv3c5d5nehay2smu4zjsy
Impedance modeling and stability analysis of the IMAF-PLL-based NPC three-level LCL gridconnected inverter
2020
IEEE Access
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In the grid-connected system, grid-connected power inverters are viable for use as a phase-locked loop to detect the phase and frequency of the grid voltage to effectively control the energy transmission ...
Moreover, the positive and negative sequence output impedance models was developed by considering the effect of filter parameters and phase-locked loop parameters. ...
doi:10.1109/access.2020.3038879
fatcat:ydrb7x6krrcmfluu3ig6lt7nhm
Grid Synchronization Enhancement of Distributed Generators Using an Adaptive Phase-Locked Loop Tuning System
2022
Electronics
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PLL controllers to reduce problems related to renewable energy sources and connect to the point of common coupling (PCC). ...
This paper proposes an effective algorithm; this algorithm is updating the phase-locked loop (PLL) gains according to the value of the short circuit ratio that will decrease the weak grid effect in the ...
Conflicts of Interest: The authors declare no conflicts of interest. ...
doi:10.3390/electronics11050702
fatcat:mrgsuuczu5brzcyaknflbckonq
Analysis of phase-locked loop influence on the stability of single-phase grid-connected inverter
2015
2015 IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
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PARAMETERS OF A SINGLE-PHASE GRID-CONNECTED INVERTER. ...
In these cases, harmonic emissions of inverters are likely induced by the interaction between the inverter control system, e.g. PLL and current control, and grid impedance [2] . ...
doi:10.1109/pedg.2015.7223089
fatcat:ex74xwvpeveqfhobkgrd7qdadm
Impedance Reshaping Control Strategy for Improving Resonance Suppression Performance of a Series-Compensated Grid-Connected System
2021
Energies
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In this paper, firstly, considering the effects of the phase-locked loop (PLL), current-loop, and frequency coupling, the broadband impedance model of the SCGCS is established. ...
In the series-compensated grid-connected system (SCGCS), there is an impedance interaction between the inverter impedance and the grid impedance that is prone to cause resonance in the SCGCS. ...
Effect of Parameters on Stability According to Figure 1 , in an interconnected system of inverters and power grids, the grid-connected inverter can be regarded as the Norton equivalent circuit of the ...
doi:10.3390/en14102844
fatcat:24u2fj3z4ne4fkj4xljdja7rcy
Improved Grid Impedance Compensation for Phase-Locked Loop to Stabilize the Very-Weak-Grid Connection of VSIs
2022
IEEE Transactions on Power Delivery
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A comprehensive small-signal model of the VSI using the proposed PLL's grid impedance compensation is derived for stability analysis and parameter design. ...
Therefore, in this paper, an improved grid impedance compensation for the PLL is proposed to achieve the same stabilization for very-weak-grid connection and possess a good tolerance of grid impedance ...
After the timedomain test for VSI system, this small-signal impedance model can effectively involve the parameter design for VSI connecting to a very weak grid. Fig. 1 . 1 Fig. 1. ...
doi:10.1109/tpwrd.2021.3140024
fatcat:g65kgspefrcz5apkdflgj3e37y
An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids
2022
Frontiers in Energy Research
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Although the stability of the grid-connected photovoltaics (PV) and energy storage systems under weak grids has been widely researched, the classical improvement methods focus more on suppressing the harmonics ...
Finally, the output impedance frequency characteristic analysis and the hardware-in-the-loop (HIL) simulation results show that the proposed control method can effectively improve the stability of the ...
For the grid-connected inverter, the small-signal analysis and impedance method are used to analyze the stability of the system, including the influence of the PLL and the voltage loop controller. ...
doi:10.3389/fenrg.2022.939376
fatcat:6sxfswug2rgvnffhr3mhpt3nra
Coupling Effect Analysis and Control for Grid-Connected Multi-Microgrid Clusters
2020
IET Power Electronics
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Hence, considering the coupling effect among inverters and achieving a solution for resonance damping is necessary for designing the control system. ...
Also, the control system design for inverters considering the coupling effect among parallel inverters inside a microgrid and coupling effect of other microgrid is clarified, elaborately. ...
Therefore, the coupling effect of parallel inverters in microgrid 2, as well as the coupling effect of microgrid 1 is considered in control system design for inverters in microgrid 2. ...
doi:10.1049/iet-pel.2019.0632
fatcat:chp75ko7vbbthg4ldcrge2pose
Passivity Enhancement Strategy of Grid-Connected Inverter System Based on the Adaptive Active Damper
2022
Frontiers in Energy Research
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The grid-connected inverter system may be unstable when connected to a weak grid, and installing an active damper as a virtual resistor at the PCC is convenient for stabilizing the system. ...
Furthermore, the admittances of the grid-connected inverter system with the active damper are derived, and the real parts of the admittances of the whole system have been calculated. ...
ACKNOWLEDGMENTS The authors gratefully acknowledge the support of the National Natural Science Foundation of China (51877042). ...
doi:10.3389/fenrg.2022.878450
fatcat:ogqmm6wayrfczfitjiccnb2umy
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