基于潮流、可靠性线性化分析的海上风电场集电系统集中式拓扑优化

海上风电是新型电力系统的重要支撑,其集电系统需要大量昂贵海缆,占总成本比重较高,优化规划较为困难。为此,提出适宜集电系统的含网损线性潮流模型,基于决策变量构建潮流约束。考虑开关的优化配置,将可靠性综合成本引入模型,并对场景进行解耦,基于网络流模型构建故障功率流变量实现具有可靠性的数学约束化建模分析。综合多方面成本建立集电系统规划模型,将风机聚类后,进行集中式优化得到最优的拓扑设计。同时,提出标准成本的概念以综合评判设计方案与求解模型的优劣。最后,通过该方法与现有方法的算例对比,说明该方法得到的方案具有更低的标准成本,该模型具有更好的计算精度。综上,所提出的模型及方法更适宜于集电系统的规划分析问题。

Centralized topology optimization of offshore wind farm collector system based on linearization analysis of power flow and reliability

Offshore wind power is an important support for the new power system. Its collector system requires a large number of expensive submarine cables, accounting for a higher proportion of the total cost, and it is more difficult to be optimal planned. For this reason, a loss-contained linear power flow model suitable for collector system is proposed, and the power flow constraints are constructed based on decision variables. Considering the optimization of switch configuration, the reliability comprehensive cost is introduced into the model, and the scene is decoupled, the outage power flow variable is constructed based on the network flow model to achieve the modeling and analysis of mathematical constraint form of reliability. The planning model of collector system is built by integrating the costs of various aspects. After clustering the wind turbines, the centralized optimization is performed to obtain the optimal grid topology. At the same time, the concept of standard cost is put forward to comprehensively judge the planning scheme and solution model. Finally, the comparison of the case study between the existing method and the proposed method shows that the solution obtained by the proposed method has a lower standard cost and the proposed model has better calculation accuracy. In summary, the proposed model and method are more suitable for the planning analysis problem of the collector system.