Abstract
The dual-feedback control combining inverter current control and capacitor-current active damping is widely applied for LCL-type grid-connected inverters. This paper investigates the operation cases of this dual-feedback control, paving a path for a robust design. Theoretical analysis is presented to provide a design guideline. A robust damping gain is derived which can ensure robustness against the grid inductance variation. However, it is found that this property is subjected to both filter parameter fluctuations and the lagging phase of the current regulator. To address these issues, extra phase-lead compensation is suggested to be embedded with the current regulator. On top of these, a robust single-feedback inverter current control is developed, where the capacitor current is extracted from the sensed inverter current for active damping, and the proportional-integral-resonant current regulator is used for avoiding the dc bias. The proposed strategy combines high robustness and cost-efficiency. Experimental results from a 6-kW prototype are finally provided to confirm the theoretical analysis and expectations.
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References
Blaabjerg F, Yang Y, Yang D, Wang X (2017) Distributed power-generation systems and protection. Proc IEEE 105(7):1311–1331
Peng Q, Jiang Q, Yang Y, Liu T, Wang H, Blaabjerg F (2019) On the stability of power electronics-dominated systems: challenges and potential solutions. IEEE Trans Ind Appl 55(6):7657–7670
Le J, Zhao L, Liao X, Zhou Q, Liang H (2021) Stability analysis of grid-connected inverter system containing virtual synchronous generator under time delay and parameter uncertainty. J Electr Eng Technol 16(4):1779–1792
Rocabert J, Luna A, Blaabjerg F, Rodríguez P (2012) Control of power converters in AC microgrids. IEEE Trans Power Electron 27(11):4734–4749
Dragičević T, Vazquez S, Wheeler P (2021) Advanced control methods for power converters in DG systems and microgrids. IEEE Trans Ind Electron 68(7):5847–5862
Zou C, Rao H, Xu S, Li Y, Li W, Chen J, Zhao X, Yang Y, Lei B (2018) Analysis of resonance between a VSC-HVDC converter and the AC grid. IEEE Trans Power Electron 33(12):10157–10168
Wang X, Blaabjerg F (2019) Harmonic stability in power electronic- based power systems: concept, modeling, and analysis. IEEE Trans Smart Grid 10(3):2858–2870
He J, Li YW (2012) Generalized closed-loop control schemes with embedded virtual impedances for voltage source converters with LC or LCL filters. IEEE Trans Power Electron 27(4):1850–1861
Zhao J, Li K, Wang X et al (2021) A novel passivity-based resonant instability suppression method for grid-connected VSC. J Electr Eng Technol 16:321–331
Faiz MT, Khan D, Khan MM, Ali A, Tang H (2021) Improved stability and damping characteristics of LCL-filter based distributed generation system. J Electr Eng Technol 16:1619–1635
Pan D, Ruan X, Bao C, Li W, Wang X (2015) Optimized controller design for LCL-type grid-connected inverter to achieve high robustness against grid-impedance variation. IEEE Trans Ind Electron 62(3):1537–1547
Wang X, Blaabjerg F, Loh PC (2015) Virtual RC damping of LCL-filtered voltage source converters with extended selective harmonic compensation. IEEE Trans Power Electron 30(9):4726–4737
Liu T, Liu J, Liu Z, Liu Z (2020) A study of virtual resistor-based active damping alternatives for LCL resonance in grid-connected voltage source inverters. IEEE Trans Power Electron 35(1):247–262
He Y, Wang X, Ruan X, Pan D, Qin K (2021) Hybrid active damping combining capacitor current feedback and point of common coupling voltage feedforward for LCL-type grid-connected inverter. IEEE Trans Power Electron 36(2):2373–2383
Dannehl J, Fuchs FW, Thøgersen PB (2010) PI state space current control of grid-connected PWM converters with LCL filters. IEEE Trans Power Electron 25(9):2320–2330
Wang X, Blaabjerg F, Loh PC (2017) Passivity-based stability analysis and damping injection for multi paralleled VSCs with LCL filters. IEEE Trans Power Electron 32(11):8922–8935
Xin Z, Mattavelli P, Yao W, Yang Y, Blaabjerg F, Loh PC (2018) Mitigation of grid-current distortion for LCL-filtered voltage-source inverter with inverter-current feedback control. IEEE Trans Power Electron 33(7):6248–6261
Dannehl J, Fuchs FW, Hansen S, Thøgersen PB (2010) Investigation of active damping approaches for PI-based current control of grid-connected pulse width modulation converters with LCL filters. IEEE Trans Ind Appl 46(4):1509–1517
Wang X, Li YW, Blaabjerg F, Loh PC (2015) Virtual-impedance- based control for voltage-source and current-source converters. IEEE Trans Power Electron 30(12):7019–7037
Pan D, Ruan X, Wang X, Yu H, Xing Z (2017) Analysis and design of current control schemes for LCL-type grid-connected inverter based on a general mathematical model. IEEE Trans Power Electron 32(6):4395–4410
Xie C, Li K, Zou J, Guerrero JM (2020) Passivity-based stabilization of LCL-type grid-connected inverters via a general admittance model. IEEE Trans Power Electron 35(6):6636–6648
Cai Y, He Y, Zhou H, Liu J (2020) Active damping disturbance rejection control strategy of LCL grid-connected inverter based on inverter-side current feedback. IEEE J Emerg Sel Topics Power Electron 9(6):7183–7198
Harnefors L, Yepes AG, Vidal A, Doval-Gandoy J (2015) Passivity-based controller design of grid-connected VSCs for prevention of electrical resonance instability. IEEE Trans Ind Electron 62(2):702–710
Miskovic V, Blasko V, Jahns TM, Smith AHC, Romenesko C (2014) Observer-based active damping of LCL resonance in grid-connected voltage source converters. IEEE Trans Ind Appl 50(6):3977–3985
Awal MA, Flora LD, Husain I (2022) Observer based generalized active damping for voltage source converters with LCL filters. IEEE Trans Power Electron 37(1):125–136
Zhao J, Xie C, Li K, Zou J, Guerrero JM (2021) Passivity-oriented design of LCL-type grid-connected inverters with Luenberger observer-based active damping. IEEE Trans Power Electron 37(3):2625–2635
Tang Y, Loh PC, Wang P, Choo FH, Gao F (2012) Exploring inherent damping characteristic of LCL-filters for three-phase grid- connected voltage source inverters. IEEE Trans Power Electron 27(3):1433–1443
Zhou L, Zhou X, Chen Y, Lv Z, He Z, Wu W, Yang L, Yan K, Luo A, Guerrero JM (2018) Inverter-current-feedback resonance-suppression method for LCL-type DG system to reduce resonance-frequency offset and grid-inductance effect. IEEE Trans Ind Electron 65(9):7036–7048
Buso S, Mattavelli P (2015) Digital control in power electronics, 2nd edn. Morgan & Claypool, San Rafael, CA, USA
Liserre M, Teodorescu R, Blaabjerg F (2006) Stability of photovoltaic and wind turbine grid-connected inverters for a large set of grid impedance values. IEEE Trans Power Electron 21(1):263–272
Holmes DG, Lipo TA, McGrath BP, Kong WY (2009) Optimized design of stationary frame three phase AC current regulators. IEEE Trans Power Electron 24(11):2417–2426
Yepes AG, Vidal A, Malvar J, Lopez O, Gandoy JD (2014) Tuning method aimed at optimized settling time and overshoot for synchronous proportional-integral current control in electric machines. IEEE Trans Power Electron 29(6):3041–3054
Harnefors L, Wang X, Yepes AG, Blaabjerg F (2016) Passivity-based stability assessment of grid-connected VSCs—an overview. IEEE J Emerg Sel Topics Power Electron 4(1):116–125
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Fan, Z., Yi, H., Xu, J. et al. Single-Feedback Based Inverter-Current-Controlled LCL-Type Grid-Connected Inverters with Capacitor-Current Active Damping: Robust Design and Single-Feedback Implementation. J. Electr. Eng. Technol. (2024). https://doi.org/10.1007/s42835-024-01914-8
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DOI: https://doi.org/10.1007/s42835-024-01914-8