A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

Resumé

Resonance phenomenon of grid-connected inverter may happen due to dynamic variation of grid impedance. Terminal output impedance of inverter can be reshaped by retuning internal parameters of inverter to mitigate resonance issue and stabilize grid-connected inverter system. However, it’s not easy to obtain internal parameters of grid-connected inverter in practical operation due to industrial secrecy. This paper presents a grey-box parameters identification method to extract the internal parameters of LCL filter, the proportional coefficient of current controller and capacitor-current feedback coefficient from the measured terminal impedance frequency responses by using vector fitting algorithm. When instability phenomenon of multiple-parallel inverters system occurs, the internal parameters of each inverter are first identified by using the proposed method. Then, the capacitor-current-feedback coefficients are re-tuned to stabilize the studied power system according to the impedance-based stability criterion. The re-designed parameters for the specific grid condition can be delivered to the manufacturer for further parameters modification. Simulation results are given to validate the proposed grey-box parameter identification and corresponding impedance reshaping method.
OriginalsprogEngelsk
Titel10th International Conference on Power Electronics - ECCE Asia
Publikationsdato30 jan. 2019
StatusAccepteret/In press - 30 jan. 2019

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Identification (control systems)
Capacitors
Damping
Feedback
Stability criteria
Frequency response
Controllers

Citer dette

Zhou, W., Wang, Y., & Chen, Z. (Accepteret/In press). A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping. I 10th International Conference on Power Electronics - ECCE Asia
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title = "A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping",
abstract = "Resonance phenomenon of grid-connected inverter may happen due to dynamic variation of grid impedance. Terminal output impedance of inverter can be reshaped by retuning internal parameters of inverter to mitigate resonance issue and stabilize grid-connected inverter system. However, it’s not easy to obtain internal parameters of grid-connected inverter in practical operation due to industrial secrecy. This paper presents a grey-box parameters identification method to extract the internal parameters of LCL filter, the proportional coefficient of current controller and capacitor-current feedback coefficient from the measured terminal impedance frequency responses by using vector fitting algorithm. When instability phenomenon of multiple-parallel inverters system occurs, the internal parameters of each inverter are first identified by using the proposed method. Then, the capacitor-current-feedback coefficients are re-tuned to stabilize the studied power system according to the impedance-based stability criterion. The re-designed parameters for the specific grid condition can be delivered to the manufacturer for further parameters modification. Simulation results are given to validate the proposed grey-box parameter identification and corresponding impedance reshaping method.",
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A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping. / Zhou, Weihua; Wang, Yanbo; Chen, Zhe.

10th International Conference on Power Electronics - ECCE Asia. 2019.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

TY - GEN

T1 - A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping

AU - Zhou, Weihua

AU - Wang, Yanbo

AU - Chen, Zhe

PY - 2019/1/30

Y1 - 2019/1/30

N2 - Resonance phenomenon of grid-connected inverter may happen due to dynamic variation of grid impedance. Terminal output impedance of inverter can be reshaped by retuning internal parameters of inverter to mitigate resonance issue and stabilize grid-connected inverter system. However, it’s not easy to obtain internal parameters of grid-connected inverter in practical operation due to industrial secrecy. This paper presents a grey-box parameters identification method to extract the internal parameters of LCL filter, the proportional coefficient of current controller and capacitor-current feedback coefficient from the measured terminal impedance frequency responses by using vector fitting algorithm. When instability phenomenon of multiple-parallel inverters system occurs, the internal parameters of each inverter are first identified by using the proposed method. Then, the capacitor-current-feedback coefficients are re-tuned to stabilize the studied power system according to the impedance-based stability criterion. The re-designed parameters for the specific grid condition can be delivered to the manufacturer for further parameters modification. Simulation results are given to validate the proposed grey-box parameter identification and corresponding impedance reshaping method.

AB - Resonance phenomenon of grid-connected inverter may happen due to dynamic variation of grid impedance. Terminal output impedance of inverter can be reshaped by retuning internal parameters of inverter to mitigate resonance issue and stabilize grid-connected inverter system. However, it’s not easy to obtain internal parameters of grid-connected inverter in practical operation due to industrial secrecy. This paper presents a grey-box parameters identification method to extract the internal parameters of LCL filter, the proportional coefficient of current controller and capacitor-current feedback coefficient from the measured terminal impedance frequency responses by using vector fitting algorithm. When instability phenomenon of multiple-parallel inverters system occurs, the internal parameters of each inverter are first identified by using the proposed method. Then, the capacitor-current-feedback coefficients are re-tuned to stabilize the studied power system according to the impedance-based stability criterion. The re-designed parameters for the specific grid condition can be delivered to the manufacturer for further parameters modification. Simulation results are given to validate the proposed grey-box parameter identification and corresponding impedance reshaping method.

M3 - Article in proceeding

BT - 10th International Conference on Power Electronics - ECCE Asia

ER -

Zhou W, Wang Y, Chen Z. A Grey-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping. I 10th International Conference on Power Electronics - ECCE Asia. 2019