An active damping method to reduce output impedance of converters in voltage source cascaded system

Pengyu Jia, Yan Li, Trillion Q. Zheng

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In a cascaded power system, the system stability can be affected by the impedance interaction of the source converter and the load converter. Many literatures analyzed the effects on the impedance characteristics of the converter from different control methods and circuit parameters. Besides, different passive damping methods and control methods to improve the impedance characteristics of the converter are proposed to ensure the cascaded system stable. On the basis of the small signal model, an active damping method to emulate a virtual resistor, which is connected in parallel with the output of the converter's small signal model, is presented in this paper. By this means, the output impedance of the converter can be decreased and the damping characteristics can be improved. The AC component of the output voltage needs to be sampled by the active damping controller so the steady-state operating point is not affected. Therefore, the effects caused by the impedance interaction between the source converter and load converter can be weakened. The effectiveness of this method is verified by the simulation and experiment results.

Original languageEnglish (US)
Pages (from-to)71-82
Number of pages12
JournalDiangong Jishu Xuebao/Transactions of China Electrotechnical Society
Volume30
Issue number8
StatePublished - Apr 25 2015

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Damping
Electric potential
System stability
Resistors
Controllers
Networks (circuits)
Experiments

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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abstract = "In a cascaded power system, the system stability can be affected by the impedance interaction of the source converter and the load converter. Many literatures analyzed the effects on the impedance characteristics of the converter from different control methods and circuit parameters. Besides, different passive damping methods and control methods to improve the impedance characteristics of the converter are proposed to ensure the cascaded system stable. On the basis of the small signal model, an active damping method to emulate a virtual resistor, which is connected in parallel with the output of the converter's small signal model, is presented in this paper. By this means, the output impedance of the converter can be decreased and the damping characteristics can be improved. The AC component of the output voltage needs to be sampled by the active damping controller so the steady-state operating point is not affected. Therefore, the effects caused by the impedance interaction between the source converter and load converter can be weakened. The effectiveness of this method is verified by the simulation and experiment results.",
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An active damping method to reduce output impedance of converters in voltage source cascaded system. / Jia, Pengyu; Li, Yan; Zheng, Trillion Q.

In: Diangong Jishu Xuebao/Transactions of China Electrotechnical Society, Vol. 30, No. 8, 25.04.2015, p. 71-82.

Research output: Contribution to journalArticle

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AU - Zheng, Trillion Q.

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