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Design and Implementation of Single-phase LC Grid-connected Inverter Parallel Operation System based on Second-order Generalized Integrator

Published: 07 March 2024 Publication History

Abstract

The inverter is an important device for connecting the photovoltaic power generation system to the power grid. With the gradual development of new energy, the capacity requirements of grid-connected inverters have gradually increased, and it is difficult for a single inverter to meet the requirements of the grid-connected system. In order to solve the above problems, this paper designs a single-phase inverter parallel system that can be used for grid-connected power generation systems. The system uses TMS320F28379D as the control core, adopts DC-AC conversion strategy, and the main inverter topology is a full-bridge inverter circuit. The control strategy adopts double closed-loop control of voltage and current under the dq coordinate system, and uses a PI controller to achieve synchronous tracking of the inner loop current without static error and stable voltage output of the outer loop voltage. Phase locking and automatic grid connection functions are realized through software zero-crossing detection, second-order generalized integrator and double closed-loop control. The parallel inverter adopts master-slave control mode to achieve the purpose of current sharing and realize fixed power distribution of the parallel inverter. This system has the characteristics of high conversion efficiency and strong stability. In addition, it is designed with buttons and display functions for real-time display of system parameters and setting related parameters, and has good human-computer interaction.

References

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Liu Shukui, Han Ying, Li Qi, Fuel cell grid-connected system based on dual second order generalized integrator phase locked loop[J]. Power System Protection and Control, 2014, 42(5): 122-128.
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Hu Yingzhan, Guo Suna. Design of generalized integrator phase locked loop for unbalanced grid[J]. Power System Protection and Control, 2014, 42(11): 148-154.
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Zhao Xin, Jin Xinmin, Yang Jie, Novel unbalanced control scheme of grid-connected inverter[J]. Transactions of China Electrotechnical Society, 2014, 29(1): 257-265.
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S. TOLAMNI, V. GAUTAM, P. SENSARMA. Improved Selective Frequency Active Damping for Voltage Source Inverter with Output LC Filter. IEEE Transactions on Industry Applications, 2020, 56(5): 5194-5201
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J. W. HE, Q. LI, C. H. Zhang, Quasi-Selective Harmonic Elimination (Q-SHE) Modulation-Based DC Current Balancing Method for Parallel Current Source Converters. IEEE Transactions on Power Electronics, 2019, 34(8): 7422-7436
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K. LI, X. D. WANG, Z. H. DONG, Elimination of Zero Sequence Circulating Current Between Parallel Operating Three-Level Inverters. IECON 2016 - 42nd Annual Conference of the IEEE Industrial Electronics Society. Florence, Italy: IEEE, 2016: 2277-2282

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  1. Design and Implementation of Single-phase LC Grid-connected Inverter Parallel Operation System based on Second-order Generalized Integrator

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    ICNCC '23: Proceedings of the 2023 12th International Conference on Networks, Communication and Computing
    December 2023
    310 pages
    ISBN:9798400709265
    DOI:10.1145/3638837
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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    Association for Computing Machinery

    New York, NY, United States

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    Published: 07 March 2024

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