Abstract
To improve the output characteristics of offshore wind power and to enhance the wind power accommodation, this paper analyzes its output characteristics along the southern coast in China, and then proposes an optimal sizing method of seawater pumped storage plant (SPSP) with variable-speed units in a connected mode on an islanded microgrid. Based on the constraints of variable-speed unit characteristics and power smoothness at the point of common coupling (PCC), the maximum static revenue as the objective function for the optimal sizing of SPSP is established. Notably, under an appropriate smoothness rate at PCC, the constraints that are mentioned above can adequately reflect the advantages of variable-speed units: fast power response and wide operating range. Additionally, they contain more concise models and variables than previously, which are friendly for optimizing the calculations. The results demonstrate that the proposed method is feasible and practical, by simulating and comparing in different scenarios.
Highlights
At the current stage, researches on wind power accommodation and fluctuations mainly focus on the onshore wind power rather than the offshore
Applying the seawater pumped storage plant (SPSP) with variable-speed units can solve the problems on both offshore wind power accommodation and power supply on islands at the same time [15]
Wind power plant, the SPSP is used to maximize the economic benefits of the islanded microgrid [24]
Summary
Researches on wind power accommodation and fluctuations mainly focus on the onshore wind power rather than the offshore. This paper proposes a solution to combine the power supply of the islanded microgrid with the offshore wind power accommodation [7] by taking advantage of variable-speed units. Taking the Canary Islands in Spain as an example, an optimal sizing method for SPSP is proposed when considering the maximum wind-solar power accommodation and the economic benefits, but fixed-speed units are still utilized [14]. Applying the SPSP with variable-speed units can solve the problems on both offshore wind power accommodation and power supply on islands at the same time [15]. The SPSP is a pure daily pumped storage facility that uses seawater as its lower reservoir It will be built near the seaside or on a remote island, which can reduce the cost of operation and transmission line construction. The contributing factors to the revenue of SPSP are discussed
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