Two-Stage Control for Small-Signal Modeling and Power Conditioning of Grid-‎Connected Quasi-Z-Source Inverter with LCL Filter for Photovoltaic ‎Generation ‎

Document Type : Research paper

Authors

1 Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

2 Energy Management Research Center, University of Mohaghegh Ardabili, Ardabil, Iran.‎

3 ‎Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.‎

4 Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.‎

Abstract

Grid-connected inverter-based photovoltaic (PV) systems play an important role in Distributed Power Generation (DPG). For this application, quasi impedance source inverter is very suitable due to its ability to increase or decrease the output voltage of the inverter in a single-stage and high reliable condition. Conventionally, to remove the harmonics, which are yielded by switching the grid-connected inverter, LCL filters are utilized at the inverter output. These filters can cause some problems at the Point of Common Coupling (PCC). The aim of this paper is to improve the quality of the injected power of the photovoltaic array, which is connected to the low voltage grid by quasi-Z-source inverter (QZSI). For this purpose, a two-stage control procedure containing DC and AC stages is performed. In the DC stage, the dynamic characteristics of the quasi-Z-source network are investigated by small-signal analysis. Using the transfer functions obtained from the dynamic model, the capacitor voltage of the quasi-Z-source network is suitably controlled to generate the appropriate voltage to the grid interface inverter. In the AC stage, in order to inject high-quality current into the grid as well as eliminating the resonance peak caused by the LCL filter, a systematic procedure is used to design the PR controller parameters and active damping coefficient. Simulation of the overall system includes solar panels, maximum power point tracking algorithm, quasi-Z-source inverter, and LCL filter to model the grid-tied PV system with the possible details. Simulations are carried out in MATLAB/Simulink environment, and results depict suitable performance of the studied power conditioning system with designed parameters.

Keywords

References

[1]    H. Yousefi, S. Gholamian and A. Zakariazadeh, “Distributed voltage control in distribution networks with high penetration of photovoltaic systems”, J. Oper. Autom. Power Eng., vol. 8, pp. 164-71, 2020.
[2]    R. Aghaie and M. Farshad, “Maximum power point tracker for photovoltaic systems based on moth-flame optimization considering partial shading conditions”, J. Oper. Autom. Power Eng., vol. 7, pp. 176-186, 2019.
[3]    H. Abu-Rub et al., “Quasi-Z-source inverter-based photovoltaic generation system with maximum power tracking control using ANFIS”, IEEE Trans. Sustain. Energy, vol. 4, pp. 11-20, 2013.
[4]    M. Shahparasti et al., “Quasi Z-source inverter for photovoltaic system connected to single phase AC grid”, 1st Power Electron. Drive Syst. Technol. Conf., pp. 456-460, 2010.
[5]    M. Hosseinpour and N. Rasekh, “A Single-Phase Grid-tied PV based Trans-Z-Source Inverter Utilizing LCL filter and Grid Side Current Active Damping”, J. Energy Manage. Technol., vol. 3, pp. 67-77, 2019.
[6]    M. Farhadi Kangarlu, E. Babaei and F. Blaabjerg, “An LCL-filtered single-phase multilevel inverter for grid integration of PV systems”, J. Oper. Autom. Power Eng., vol. 4, pp. 54-65, 2016.
[7]    P. Alemi, C. Bae and D. Lee, “Resonance suppression based on PR control for single-phase grid-connected inverters with LLCL filters”, IEEE J. Emerg. Selected Top. Power Electron., vol. 4, pp. 459-467, 2015.
[8]    S. Jayalath and M. Hanif, “An LCL-filter design with optimum total inductance and capacitance”, IEEE Trans. Power Electron., vol. 33, pp. 6687-98, 2017.
[9]    W. Wu et al., “Damping methods for resonances caused by LCL-filter-based current-controlled grid-tied power inverters: an overview”, IEEE Trans. Ind. Electron., vol. 64, pp. 7402-13, 2017.
[10]    R. Alzola et al., “Analysis of the passive damping losses in LCL-filter-based grid converters”, IEEE Trans. Power Electron., vol. 28, pp. 2642-46, 2012.
[11]    B, Bahrani, M. Vasiladiotis and A. Rufer, “High-order vector control of grid-connected voltage-source converters with LCL-filters”, IEEE Trans. Ind. Electron., vol. 61, pp. 2767-75, 2013.
[12]    X. Wang, F. Blaabjerg and P. Loh, “Grid-current-feedback active damping for LCL resonance in grid-connected voltage-source converters”, IEEE Trans. Power Electron., vol. 31, pp. 213-23, 2015.
[13]    N. Rasekh et al., “A step by step design procedure of PR controller and capacitor current feedback active damping for a LCL-type grid-tied T-type inverter”, Int. Power Electron. Drive Syst. Technol. Conf., pp. 612-617, 2019.
[14]    Z. Xin et al., “Highly accurate derivatives for LCL-filtered grid converter with capacitor voltage active damping”, IEEE Trans. Power Electron., vol. 31, pp. 3612-25, 2015.
[15]    X. Wang, F. Blaabjerg and P. Loh, “Grid-current-feedback active damping for LCL resonance in grid-connected voltage-source converters”, IEEE Trans. Power Electron., vol. 31, pp. 213-23, 2015.
[16]    Y. Guan et al., “The dual-current control strategy of grid-connected inverter with LCL filter”, IEEE Trans. Power Electron., vol. 34, pp. 5940-52, 2018.
[17]    M. Forouzesh et al., “Small-signal modeling and comprehensive analysis of magnetically coupled impedance-source converters”, IEEE Trans. Power Electron., vol. 31, pp. 7621-7641, 2016.
[18]    Y. Li et al., “Modeling and control of quasi-Z-source inverter for distributed generation applications”, IEEE Trans. Ind. Electron., vol. 60, pp. 1532-54, 2012.
[19]    A. Ayad and R. Kennel, “A comparison of quasi-Z-source inverters and conventional two-stage inverters for PV applications”, EPEJ, vol. 27, pp. 43-59, 2017.
[20]    Y. Liu et al., “Modelling and controller design of quasi-Z-source inverter with battery-based photovoltaic power system”, IET Power Electron., vol. 7, pp. 1665-74, 2014.
[21]    N. Rasekh et al., “Robust power conditioning system based on LCL-type quasi-Y-source inverter for grid connection of photovoltaic arrays”, Int. J. Autom. Control, 2021.
[22]    N. Rasekh and M. Hosseinpour, “Adequate tuning of LCL filter for robust performance of converter side current feedback control of grid connected modified–y-source inverter”, Int. J. Ind. Electron. Control Optimiz., vol. 3, pp. 365-378, 2020.
[23]    M. Sanatkar-Chayjani and M. Monfared, “Stability analysis and robust design of LCL with multituned traps filter for grid-connected converters”, IEEE Trans. Ind. Electron., vol. 63, pp. 6823-34, 2016.
[24]    A. Rajabi, M. Simab and J. Aghaei, “Design of a power-conditioning system for trans-z-source inverter to connect photovoltaic arrays to single-phase household electrical grid”, Iran. J. Sci. Technol. Trans. Electr. Eng., vol. 42, pp. 393-402, 2018.
[25]    N. Noroozi and H. Gholizade Narm, “Direct power control of an under-damped grid connected boost inverter”, Int. J. Ind. Electron. Control Optimiz., vol. 2, pp. 17-24, 2019.
[26]    M. Hosseinpour and A. Dejamkhooy, “Control and power sharing among parallel three‐phase three‐wire and three‐phase four‐wire inverters in the presence of unbalanced and harmonic loads”, IEEJ Trans. Electr. Electron. Eng., vol. 13, pp. 1027-33, 2018.
[27]    C. Bao et al., “Step-by-step controller design for LCL-type grid-connected inverter with capacitor–current-feedback active-damping”, IEEE Trans. Power Electron., vol. 29, pp. 1239-53, 2013.
Journal of Operation and Automation in Power Engineering
Volume 9, Issue 3
December 2021
Pages 242-255

Files

History

  • Receive Date: 29 August 2020
  • Revise Date: 14 January 2021
  • Accept Date: 26 February 2021
  • First Publish Date: 24 March 2021

Share

How to cite

Statistics