The optimal planning of the electrical collector and transmission grid-connected system has a significant impact on the investment economy and operational reliability of the offshore wind farms(OWFs).For the AC electrical collector and the voltage source converter-based multi-terminal DC(VSC-MTDC)transmission grid-connected mode in the OWF,a multi-objective optimal planning model with topology and power flow coupling considering the economy and reliability is established.The proposed model uses the topological redundancy to directly approximate the electric energy loss caused by the wind turbine outage.It considers the topology of the AC electrical collector system with the new double-sided ring structure and the one of the VSC-MTDC transmission system based on the connectivity constraints,and realizes the optimal planning for the topology connection of the electrical collector and transmission system,the types of AC and DC submarine cables,the number,capacity and location of offshore step-up converter substations,and the number of feeders connected to offshore step-up converter substations.Moreover,a method for directly solving the compromise optimal solution(COS)of the multi-objective problems is proposed.The original mixed integer nonlinear programming(MINLP)model is transformed into a mixed integer convex quadratic programming(MICQP)model by convexity,which is solved efficiently to obtain the optimal planning scheme.Finally,two actual OWFs with 36 wind turbines and 78 wind turbines respectively are analyzed to verify the correctness and effectiveness of the proposed model and method.
关键词
海上风电场/交流集电系统/多端柔直输电系统/拓扑优化/多目标优化规划
Key words
offshore wind farm/AC electrical collector system/voltage source converter-based multi terminal DC transmission system/topology optimization/multi-objective optimal planning
维普
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