TY - JOUR
T1 - Frequency Support From a DC-Grid Offshore Wind Farm Connected Through an HVDC Link
T2 - A Communication-Free Approach
AU - Kou, Peng
AU - Liang, Deliang
AU - Wu, Zihao
AU - Ze, Qiji
AU - Gao, Lin
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/9
Y1 - 2018/9
N2 - DC collection grid and high-voltage direct-current (HVDC) transmission lines provide promising solutions for an offshore wind farm (OWF). However, due to the decoupling effect of the dc collection grid and an HVDC link, an HVDC-connected dc-grid OWF cannot directly participate in the frequency regulation of the onshore ac grid. To address this issue, this paper presents a communication-free control scheme, which allows an HVDC-connected all-dc OWF to contribute to the onshore ac grid frequency regulation. This scheme consists of making the offshore dc collection grid voltage and onshore frequency deviations proportional. It relies on the HVDC voltage control at the onshore converter, together with the dc collection grid voltage control at the offshore converter. Furthermore, by continuously adjusting the droop of each wind generator in response to its local wind speed, this scheme takes into account the wind speed difference among wind generators, thereby improving the frequency nadir/peak and guaranteeing the wind generator stability. Simulation results verify the effectiveness of the proposed scheme.
AB - DC collection grid and high-voltage direct-current (HVDC) transmission lines provide promising solutions for an offshore wind farm (OWF). However, due to the decoupling effect of the dc collection grid and an HVDC link, an HVDC-connected dc-grid OWF cannot directly participate in the frequency regulation of the onshore ac grid. To address this issue, this paper presents a communication-free control scheme, which allows an HVDC-connected all-dc OWF to contribute to the onshore ac grid frequency regulation. This scheme consists of making the offshore dc collection grid voltage and onshore frequency deviations proportional. It relies on the HVDC voltage control at the onshore converter, together with the dc collection grid voltage control at the offshore converter. Furthermore, by continuously adjusting the droop of each wind generator in response to its local wind speed, this scheme takes into account the wind speed difference among wind generators, thereby improving the frequency nadir/peak and guaranteeing the wind generator stability. Simulation results verify the effectiveness of the proposed scheme.
KW - Frequency control
KW - HVDC transmission
KW - offshore wind farm
KW - permanent magnet synchronous generator
UR - https://www.scopus.com/pages/publications/85043477937
U2 - 10.1109/TEC.2018.2814604
DO - 10.1109/TEC.2018.2814604
M3 - 文章
AN - SCOPUS:85043477937
SN - 0885-8969
VL - 33
SP - 1297
EP - 1310
JO - IEEE Transactions on Energy Conversion
JF - IEEE Transactions on Energy Conversion
IS - 3
M1 - 8310966
ER -