TY - GEN
T1 - Impact of Synchronization Phase Dynamics on DQ Impedance Measurement
AU - Gong, Hong
AU - Yang, Dongsheng
AU - Wang, Xiongfei
PY - 2018/6
Y1 - 2018/6
N2 - Small-signal stability assessment of the three-phase system can be performed using the measured impedances of the load and source. To obtain the dc steady-state operation point, the impedances are measured in the rotating dq-frame, and the phase angle is needed for the coordinate transformation used in both the perturbation injection and the impedance calculation. However, the phase estimation may introduce additional dynamics, affecting the accuracy of impedance measurement. This paper investigates the impact of phase synchronization dynamics on the measured impedance results. It is revealed that the phase variations in the perturbation injection has little effect on the measured impedance, while the phase dynamics introduced in the impedance calculation may have a significant impact. Based on impedance transformation, a new impedance calculation method is proposed, which can reduce the errors caused by the phase dynamics. Finally, the simulation and experiment results verify the accuracy of the analytical results and the effectiveness of the proposed method.
AB - Small-signal stability assessment of the three-phase system can be performed using the measured impedances of the load and source. To obtain the dc steady-state operation point, the impedances are measured in the rotating dq-frame, and the phase angle is needed for the coordinate transformation used in both the perturbation injection and the impedance calculation. However, the phase estimation may introduce additional dynamics, affecting the accuracy of impedance measurement. This paper investigates the impact of phase synchronization dynamics on the measured impedance results. It is revealed that the phase variations in the perturbation injection has little effect on the measured impedance, while the phase dynamics introduced in the impedance calculation may have a significant impact. Based on impedance transformation, a new impedance calculation method is proposed, which can reduce the errors caused by the phase dynamics. Finally, the simulation and experiment results verify the accuracy of the analytical results and the effectiveness of the proposed method.
KW - dq-frame
KW - impedance measurement
KW - impedance transformation
KW - Small-signal model
KW - synchronization phase
UR - http://www.scopus.com/inward/record.url?scp=85054496614&partnerID=8YFLogxK
UR - https://ieeexplore.ieee.org/document/8458487
U2 - 10.1109/COMPEL.2018.8458487
DO - 10.1109/COMPEL.2018.8458487
M3 - Article in proceeding
AN - SCOPUS:85054496614
SN - 978-1-5386-5542-9
T3 - IEEE Workshop on Control and Modeling for Power Electronics (COMPEL)
SP - 1
EP - 7
BT - 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics, COMPEL 2018
PB - IEEE Press
T2 - 19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018
Y2 - 25 June 2018 through 28 June 2018
ER -