Capacitor Voltage Damping Based on Parallel Feedforward Compensation Method for <i>LCL</i>-Filter Grid-Connected Inverter

Faiz, Muhammad Talib; Khan, Muhammad Mansoor; Xu, Jianping; Ali, Muhammad; Habib, Salman; Hashmi, Khurram Azeem; Tang, Houjun

doi:10.1109/tia.2019.2951115

Cited by 27 publications

(7 citation statements)

References 35 publications

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“…The

G_{d} false(s false) = e^{- T_{d} s}

is control delay function, where

T_{d}

is sampling and computational delay assumed one and half‐cycle time period of sampling frequency (i.e.

1.5 T_{s}

) [2].

G_{inv}

is conversion unit gain which is the ratio of input voltage

V_{DC}

and carrier signal magnitude

V_{tri}

, and assumed 1.…”

Section: Lcl ‐Filter Modelling and Robust Control Designmentioning

confidence: 99%

“…Current‐controlled voltage source inverters (VSIs) are commonly used to interface through LCL ‐filter due to their high power quality and cost‐effectiveness. However, the resonance issue in LCL ‐filter reduces control performance due to resonance frequency oscillations under drifting filter parameters [2]. It becomes even more challenging for the system to be robust and fulfil minimum stability margins under uncertain grid impedance due to weak grid conditions [3].…”

Section: Introductionmentioning

confidence: 99%

“…The injected current quality reduces due to low order harmonics induced by non‐ideal grid voltage conditions, distorted magnetising current of the transformer, dead‐time effect and on‐state voltage drop of converter switches [4]. In the literature, passive and active damping approaches have been extensively discussed [2, 3, 5, 6] to damp the resonance and improve control dynamics, where current controller plays a significant role in the injected current quality and system robustness.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

Faiz

Khan

Huawei³

et al. 2020

IET power electron.

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“…The

G_{d} false(s false) = e^{- T_{d} s}

is control delay function, where

T_{d}

is sampling and computational delay assumed one and half‐cycle time period of sampling frequency (i.e.

1.5 T_{s}

) [2].

G_{inv}

is conversion unit gain which is the ratio of input voltage

V_{DC}

and carrier signal magnitude

V_{tri}

, and assumed 1.…”

Section: Lcl ‐Filter Modelling and Robust Control Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

Faiz

Khan

Huawei³

et al. 2020

IET power electron.

Self Cite

View full text Add to dashboard Cite

“…However, their critical frequencies cannot approach f s /3 due to the small phase lag in the mid-and high-frequency domains. Accordingly, the damping limitation and stability challenge will occur at the critical frequency f s /3 [34]. Reference [35] introduces a new feedback link of capacitor-current based on the recursive infinite impulse response digital filter, which is equivalent to a high-order, high-pass filter with sufficient phase lead compensation.…”

Section: Introductionmentioning

confidence: 99%

An Improved Active Damping Method for Enhancing Robustness of LCL-Type, Grid-Tied Inverters under Weak Grid Conditions

Ke,

2023

Sensors

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The conventional proportional-gain-feedback link can only obtain the smallest effective damping region (EDR) due to the control delay among all the active damping methods regarding the capacitor current feedback. The digitally controlled system tends to be unstable when the system resonant frequency reaches the critical frequency caused by the grid impedance variation. To weaken the adverse effect on the system caused by the control delay, phase-lead feedback links are applied along the feedback path to provide phase compensation. By taking the simplicity and reliability of the feedback links into account, this paper proposes an alternative to an ideal differentiator, which consists of the Tustin discrete form of ‘s’ and a digital low-pass filter. This proposed method has an identical phase frequency characteristic as an ideal differentiator but a better magnitude frequency characteristic, and its EDR can reach [0, fs/3]. The system stability analysis is conducted under different resonant frequencies, and under the condition of a weak grid, the co-design approach of the active damper and digital controller is presented. Finally, the experimental results are shown to verify the proposed method.

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“…[43] introduces specific guidelines to design the parameters in the control loop of the capacitor-current-feedback active damping method. In [44], based on the limitation of the capacitor voltage(CV)…”

Section: Active Damping Methodsmentioning

confidence: 99%

Impedance shaping method to improve grid-connected inverter under weak grid condition

Zhao¹

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Primarily, I would like to pay my authentic thankfulness to Prof. Zhang Xin who is the supervisor of my research during the long phase in writing this research report. To my best appreciate, I gratefulness him for the considerable patience in every scanning during this project and provided me effect persuasion towards entire research procedure. My professor always brings me generous assistance when many hint errors and tackles about the entire process. If there is no help from my supervisor, it was impossible for me to finish a report on an appropriate standard. Furthermore, his consideration for students, in reality, entitles him to be a totally good supervisor. The understandings for students and the spiritual encouragements are always available in support. It is my honor to have Prof. Zhang supervise me on my work. Thanks a billion. Here I also want to thank those who have been encouraging me and supporting me all the time. Without their trust and help, I couldn't have the strong motivation to urge me working hard on this dissertation. Thank you all.

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Capacitor Voltage Damping Based on Parallel Feedforward Compensation Method for LCL-Filter Grid-Connected Inverter

Cited by 27 publications

References 35 publications

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

An Improved Active Damping Method for Enhancing Robustness of LCL-Type, Grid-Tied Inverters under Weak Grid Conditions

Impedance shaping method to improve grid-connected inverter under weak grid condition

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Capacitor Voltage Damping Based on Parallel Feedforward Compensation Method for LCL-Filter Grid-Connected Inverter

Cited by 27 publications

References 35 publications

H ∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

H ∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

An Improved Active Damping Method for Enhancing Robustness of LCL-Type, Grid-Tied Inverters under Weak Grid Conditions

Impedance shaping method to improve grid-connected inverter under weak grid condition

Contact Info

Product

Resources

About

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems

H _∞ robust control with improved harmonics suppression for inverter‐based distributed generation systems