For the power system interconnected with the large-scale offshore wind power through VSC-HVDC, such as SZ power grid, it may be engaged with transient frequency stability and lack of related control due to the randomness, fluctuation and intermittence of the wind. This paper proposes a transient frequency control strategy for the power system interconnected with offshore wind power through VSC-HVDC based on sensitivity. Firstly, the structure of SZ power grid and the calculation method of transient frequency stability index are introduced, and the transient frequency problems existing in SZ power grid are explored. Secondly, the mathematical formulation for the transient frequency control is described, including the objective function and the constraints. Furthermore, a transient frequency emergency control strategy based on special sequence and the sensitivities is proposed, which includes thermal units regulation, wind power regulation, DC modulation and load shedding. Finally, the effectiveness of the proposed control strategy is verified by simulation in SZ power grid.

中文翻译：

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VSC-HVDC与海上风电并网电力系统暂态稳频应急控制

对于通过VSC-HVDC与大型海上风电互联的电力系统，如SZ电网，由于风的随机性、波动性和间歇性，可能存在暂态频率稳定和缺乏相关控制的问题。本文提出了一种基于灵敏度的 VSC-HVDC 与海上风电互联电力系统的暂态频率控制策略。首先介绍了SZ电网的结构和暂态频率稳定指标的计算方法，探讨了SZ电网存在的暂态频率问题。其次，描述了瞬态频率控制的数学公式，包括目标函数和约束条件。此外，提出了一种基于特殊时序和灵敏度的暂态频率应急控制策略，包括火力机组调节、风电功率调节、直流调制和减载。最后，通过在深圳电网中的仿真验证了所提出的控制策略的有效性。