A coordinated control strategy of reactive power compensation for offshore wind power system with AC transmission

In recent years, offshore wind power has been vigorously developed. High voltage AC transmission is one of the main grid connection technologies for offshore wind power. Submarine cable has more charging power causing the problem of overvoltage more prominent. To solve the problem of line overvoltage in the AC transmission system of the offshore wind power, this paper proposes a coordinated reactive power control strategy. First, the reactive power generated by wind turbine is considered to reduce the configuration capacity of the reactive power compensation devices. Second, the reactive power compensation is divided into two parts: the land side and the wind power collecting side. Then, with the objective function of minimizing the power loss and the voltage offset, the assignment of the optimal amount of reactive power on both sides is solved. Finally, simulation results prove that the line overvoltage suppression effect of dual-terminal coordinated control strategy proposed in this paper is both economical and effective.