Distributed control of offshore wind turbine group with input delay

With the large-scale development of offshore wind power and the increasing scale of power grid interconnection, time delay mainly occurs in the signal measurement and transmission of wide area measurement system of wind farm, which leads to the performance degradation or even instability of the wind turbine system, and seriously affects the normal operation of the wind farm. Therefore, based on Hamilton energy theory, the distributed time delay control of doubly fed wind turbine group is studied in this paper. Firstly, the doubly fed wind power system is implemented to PCH-D model. Then, Casimir function is introduced into the PCH-D model of the single wind power system to make the wind power system stable under time delay. Then, the wind turbine group is networked and the distributed time delay control strategy is proposed to maintain the wind turbine group system stable in the time delay range of 30_300 ms. Finally, the simulation results show that the control strategy proposed in this paper, can effectively solve the input time delay problem, and reduce the system error caused by time delay, also improve the stability and control accuracy of the wind turbine group. © 2020, Editorial Department of Control Theory & Applications South China University of Technology. All right reserved.