Abstract
To support doubly fed wind turbine (DFWT) groups in offshore wind farms, this paper proposes a distributed coordinated control based on the Hamiltonian energy theory. This strategy provides global stability to closed-loop systems and facilitates output synchronization. First, a model of a DFWT is realized as a port-controlled Hamiltonian system with dissipation (PCH-D), and the single-machine model is expanded into a multi-machine model of a wind turbine group. Then, by using the design methodology of distributed Hamiltonian systems, a distributed coordinated control is presented for a multi-machine PCH-D system. Furthermore, to investigate failures in wind turbine groups, they are divided into two cases: the separation of failed machines from the system, and the grid-connected operation of failed machines after a fault. These cases correspond to undirected and directed graphs, respectively. Finally, simulations prove that distributed coordinated control enhances the reliability and autonomy of wind turbine groups in offshore wind farms.
Highlights
Over the last decade, the development of wind-power generation systems has progressed rapidly, and significant advancements have been achieved
A distributed coordination control mechanism has been proposed to solve the problems of wind turbine groups in offshore wind farms
Based on the Hamiltonian energy theory, the single-machine model of a doubly fed wind turbine (DFWT) is expanded to a multi-machine model with network structure information
Summary
The development of wind-power generation systems has progressed rapidly, and significant advancements have been achieved. Wind-power control technology has gained increasing research interest [1,2,3,4]. Offshore wind power has many advantages, such as abundant reserves, steady wind speed, and no land occupation. Numerous offshore wind farms have been built and more are planned; in addition, the amount of research related to offshore wind farms has increased steadily [7,8,9]. Offshore wind farms must have higher reliability and flexibility compared to onshore wind farms. The centralized control methods used in land-based wind power systems are not suitable for offshore wind power systems. To improve the reliability of offshore wind farms, we adopt distributed control instead of centralized control; this strategy can distribute the risk and increase the flexibility of the entire system
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