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access icon free Two-tier combined active and reactive power controls for VSC–HVDC-connected large-scale wind farm cluster based on ADMM

© The Institution of Engineering and Technology
Received 30/09/2019, Accepted 26/02/2020, Revised 17/01/2020, Published 27/02/2020

To reduce the voltage fluctuations inside the wind farm cluster (WFC), a combined active and reactive power control schemes based on model predictive control is proposed. The aims of the proposed control scheme are to maintain the collector bus and wind turbine (WT) terminal voltages within the feasible range. With the size of WFC increasing, conventional centralised optimal control may no longer be 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 (ADMMs) algorithm is used to solve the large-scale optimisation problem in distributed/hierarchical manner. In the upper-tier distributed control, the active and reactive power outputs of the WFs are coordinated to enhance the voltage control performance. In the lower-tier control, an ADMM-based hierarchical control is developed to minimise the voltage deviation of the WT terminals. Case studies demonstrate the efficacy of the proposed two-tier combined active and reactive power controls.

Inspec keywords: reactive power control; wind turbines; HVDC power convertors; HVDC power transmission; distributed control; optimisation; predictive control; voltage control; optimal control; wind power plants; power generation control; power control

Other keywords: model predictive control; WFC central controller; large-scale WFC; lower-tier control; multipliers algorithm; voltage fluctuations; VSC–HVDC-connected large-scale wind farm cluster; collector bus; reactive power outputs; conventional centralised optimal control; control scheme; active power outputs; two-tier control structure; reactive power control schemes; high computation burden; voltage deviation; upper-tier distributed control; voltage control performance; combined active power control schemes; reactive power controls; large-scale optimisation problem; ADMM-based hierarchical control

Subjects: Voltage control; Optimisation techniques; Wind power plants; Power and energy control; Control of electric power systems; Power system control; Optimal control; Optimisation techniques; Multivariable control systems; d.c. transmission

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