计 及 系 统 谐 振 稳 定 性 和 运 行 可 靠 性 的 海 上 风 电 分 频 送 出 规 划

Fractional frequency transmission provides a new option for large-scale, long-distance offshore wind power transmission by reducing the frequency and improving the line transmission capacity. Aiming at the impact of the high proportional renewable energy and power electronics equipment on the resonance stability and reliability of the system, and closing to the actual engineering needs, a fractional frequency transmission planning method for offshore wind power is proposed. Considering the economy, resonance stability, and reliability, the method makes fractional frequency grid connection scheme for offshore wind power. Firstly, the fractional frequency transmission system of offshore wind power and planning model of onshore industrial frequency power grid, resonance stability evaluation model, and operation reliability evaluation model are introduced. Secondly, taking the offshore wind power development in a coastal area of China as a case study, wind power transmission and onshore power grid expansion schemes are planed, and the engineering verification is carried out. Furthermore, the technical economy of three schemes of power frequency AC, flexible DC, and fractional frequency transmission are compared, and the optimal solution is selected. The results show that in the case scenario, the technical economy of fractional frequency transmission has certain advantages.