The global demand for clean energy has fuelled research into ocean energy, but single systems such as tidal power and offshore wind show difficulties to provide stable power because of their intermittency and volatility. Pumped storage can help solve these problems, but it is too expensive to build individually. In this paper, a combined tidal power system with pumped storage function is proposed, where double reservoir tidal power and pumped storage share the upper and lower reservoirs without the need for new dams, and only a small increase in the construction cost with pumped storage units and pipelines is needed to make the tidal power plant obtaining a pumped storage function, and to realise synergistic operation of tidal power, pumped storage and offshore wind power. It can provide services such as peak shaving and valley filling and power fluctuation smoothing for the power grid, and further improve the power generation benefits through flat-tide pumping. Calculation and simulation results show that the proposed synergistic operation strategy can achieve effective suppression of wind power fluctuation power, and enable grid connection in compliance with the dispatchrequired power curve, which can increase the overall power generation and the capacity factor of the tidal power units, and improve the economic benefits and energy efficiency of the energy system.
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