Two-Tier Combined Active and Reactive Power Control for VSC–HVDC Connected Large-Scale Wind Farm Cluster based on ADMM

Sheng Huang, Yusheng Gong, Qiuwei Wu, Fei Rong

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To reduce the voltage fluctuations inside the wind farm cluster (WFC), a combined active and reactive power
control scheme based on model predictive control (MPC) is proposed. The aims of the proposed control scheme are to
maintain the collector bus and WT terminal voltages within the feasible range. With the size of WFC increasing,
conventional centralized optimal control may no longer suitable for a large‐scale WFC due to the high computation burden
of the WFC central controller. To improve the calculation efficiency and protect information privacy, a two‐tier control
structure with alternating direction method of multipliers (ADMM) algorithm is used to solve the large‐scale optimization
problem in distributed/hierarchical manner. In the upper tier distributed control, the active and reactive power outputs of
the wind farms (WFs) are coordinated to enhance the voltage control performance. In the lower‐tier control, an ADMM
based hierarchical control is developed to minimize the voltage deviation of the wind turbine (WT) terminals. Case studies
demonstrate the efficacy of the proposed two‐tier combined active and reactive power control (TCARPC).
Original languageEnglish
JournalI E T Renewable Power Generation
Number of pages10
Publication statusAccepted/In press - 2020

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