Stability Improvement for Three-Phase Grid-Connected Converters Through Impedance Reshaping in Quadrature-Axis

Three-phase AC-DC and DC-AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power...

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Published inIEEE transactions on power electronics Vol. 33; no. 10; pp. 8365 - 8375
Main Authors Fang, Jingyang, Li, Xiaoqiang, Li, Hongchang, Tang, Yi
Format Journal Article
LanguageEnglish
Published New York IEEE 01.10.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Control stability
Distributed generation
Electric converters
Energy conversion
Energy storage
Frequency conversion
Impedance
Phase locked loops
phase-locked-loop (PLL)
power converter
Power converters
Power system stability
Reactive power
Stability
Stability analysis
stability improvement
Storage systems
Synchronism
synchronous frame
Time-frequency analysis
Voltage control
Waveforms
Online AccessGet full text
ISSN0885-8993
1941-0107
1941-0107
DOI10.1109/TPEL.2017.2777972

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Abstract Three-phase AC-DC and DC-AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power can properly be regulated while maintaining desired waveforms of grid currents. Grid synchronization necessitates accurate information of grid voltages, which is normally obtained through phase-locked-loops (PLLs). However, the employment of PLLs may bring in stability concerns. Previous research revealed that the inclusion of PLLs shapes the impedance of power converters into a negative resistance in the quadrature-axis (q-axis), and this should be responsible for instability. To resolve the instability issue caused by PLLs, this paper proposes an impedance controller for reshaping the q-axis impedance into a positive resistance in the low-frequency band. Without any extra burden on system hardware, the proposed controller can easily be implemented by directly relating the q -axis voltage to the q-axis current reference. As a result, the presented three-phase power conversion system can operate stably even under a severely weak grid condition, which are verified by simulation and experimental results.
AbstractList Three-phase AC-DC and DC-AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power can properly be regulated while maintaining desired waveforms of grid currents. Grid synchronization necessitates accurate information of grid voltages, which is normally obtained through phase-locked-loops (PLLs). However, the employment of PLLs may bring in stability concerns. Previous research revealed that the inclusion of PLLs shapes the impedance of power converters into a negative resistance in the quadrature-axis (q-axis), and this should be responsible for instability. To resolve the instability issue caused by PLLs, this paper proposes an impedance controller for reshaping the q-axis impedance into a positive resistance in the low-frequency band. Without any extra burden on system hardware, the proposed controller can easily be implemented by directly relating the q -axis voltage to the q-axis current reference. As a result, the presented three-phase power conversion system can operate stably even under a severely weak grid condition, which are verified by simulation and experimental results.
Author Li, Hongchang
Li, Xiaoqiang
Fang, Jingyang
Tang, Yi
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StartPage 8365
SubjectTerms Control stability
Distributed generation
Electric converters
Energy conversion
Energy storage
Frequency conversion
Impedance
Phase locked loops
phase-locked-loop (PLL)
power converter
Power converters
Power system stability
Reactive power
Stability
Stability analysis
stability improvement
Storage systems
Synchronism
synchronous frame
Time-frequency analysis
Voltage control
Waveforms
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Title Stability Improvement for Three-Phase Grid-Connected Converters Through Impedance Reshaping in Quadrature-Axis
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