TY - JOUR
T1 - Effect of reactive power characteristic of offshore wind power plant on low-frequency stability
AU - Zhou, Weihua
AU - Wang, Yanbo
AU - Torres-Olguin, Raymundo E.
AU - Chen, Zhe
N1 - Funding Information:
Manuscript received July 19, 2019; revised October 19, 2019 and December 10, 2019; accepted December 31, 2019. Date of publication January 10, 2020; date of current version May 20, 2020. This work was supported by the ForskEL and EUDP project “Voltage Control and Protection for a Grid towards 100% Power Electronics and Cable Network” under Project 880063. Paper no. TEC-00757-2019. (Corresponding author: Yanbo Wang.) W. Zhou, Y. Wang, and Z. Chen are with the Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 1986-2012 IEEE.
PY - 2020/6
Y1 - 2020/6
N2 - Oscillation phenomena of offshore wind power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer power control loop, inner current control loop and phase-locked loop is first established in dq reference frame. The correctness is validated by frequency scanning method. Then, the effects of active and reactive power/current references on dq impedance characteristics of GCI with/without consideration of power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under power control mode may occur if active power reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reactive power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reactive power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reactive power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reactive power injection.
AB - Oscillation phenomena of offshore wind power plant (OWPP) in a wide frequency range can be caused due to impedance interactions between grid-connected inverters (GCIs) and transmission cables. In this article, impedance model of GCI with outer power control loop, inner current control loop and phase-locked loop is first established in dq reference frame. The correctness is validated by frequency scanning method. Then, the effects of active and reactive power/current references on dq impedance characteristics of GCI with/without consideration of power control loop are investigated using complex space vectors and complex transfer functions. Furthermore, RLC circuit model of transmission cable considering frequency-dependent characteristics is also established for dq-domain IBSC. On the basis of them, it's found that low-frequency oscillation phenomena of OWPP under power control mode may occur if active power reference exceeds a certain threshold value, which can be mitigated by injecting a certain amount of negative reactive power. Impacts of PLL parameters, length of transmission cable and number of paralleled GCIs on required negative reactive power for low-frequency stabilization are further investigated. Both Matlab/Simulink-based simulation and OPAL-RT-based real-time verification are implemented in an OWPP with four permanent magnet synchronous generators to validate the correctness of the reactive power characteristic analysis results and the feasibility of mitigating low-frequency oscillation phenomena by negative reactive power injection.
KW - Frequency scanning
KW - grid-connected inverter (GCI)
KW - low-frequency stability
KW - offshore wind power plant (OWPP)
KW - reactive power
KW - transmission cable
UR - http://www.scopus.com/inward/record.url?scp=85085375915&partnerID=8YFLogxK
U2 - 10.1109/TEC.2020.2965017
DO - 10.1109/TEC.2020.2965017
M3 - Article
AN - SCOPUS:85085375915
SN - 0885-8969
VL - 35
SP - 837
EP - 853
JO - IEEE Transactions on Energy Conversion
JF - IEEE Transactions on Energy Conversion
IS - 2
ER -