Research On The Coordinated Planning Methods Considering The Infeasible Area In Tidal Current Farm

Tidal current generation(TCG),as a clean and great potential marine energy,has been paid great attention by all over the world in order to cope with the global energy crisis and environmental pollution problem.It is of great significance to establish tidal current farm(TCF)in order to make full use of tidal current energy resources and realize the industrialization and commercialization of TCG.The United States and some countries in Europe have established MW-level TCF,and put into commercial operation.The generation array with capacity of 6MW was built by Atlantis Company and put into commercial operation.The planning of TCF is the key issue in the construction of TCF,which is directly related to power generation efficiency,investment cost and long-term profitability of TCF.Supported by “Research on integrated probabilistic planning method of TCTs and collector system”,subsidized by the National Natural Science Foundation of China,No.51607014,the coordinated planning for TCTs micro-layout and collector system planning of TCF is studied and the details are as follows:(1)The coupling mechanism between TCTs micro-siting and collector system planning and the operation of power system are not taken into account in the existing research for the planning method of TCF.A coordinated planning method of TCF is proposed in this paper.The micro-siting strategy of TCTs and collector system planning scheme are coordinated to achieve better tradeoff between energy yields,capital investment of TCF and economical operation of power system by the proposed method.The power output of TCF is modeled considering the characteristics of tidal current velocity and wake effects.A coordinated planning model is proposed to account for the investment costs of TCF and the operating costs of power system and TCF.The effectiveness of the proposed method is demonstrated using the measured data of tidal current velocity with different characteristics,IEEE 30-bus and 118-bus test systems.The results show that reasonable planning scheme of TCF is determined by the method presented in this paper,which is beneficial to coordinate the coupling mechanism between TCTs micro-siting and collector system planning scheme,reduce the investment cost of the collector system and improve the comprehensive benefit of TCF.The investment of the collector system is reduced by more than 20% and the comprehensive benefit of TCF improves 5%~10% in this paper.(2)Aiming at the problem that it is difficult to consider the impacts of infeasible area on TCTs micro-siting and collector system planning.A planning method for TCF is presented by considering the effects of infeasible area.A mixed model of wake effects and TCF power output model with infeasible area are modeled considering the wake effects and the effects of the infeasible area.Based on bi-level programming theory,an optimization model is proposed considering the influences of infeasible area on TCTs micro-siting and the collector system.The infeasible area is avoided by using the methods of infeasible constraints.An improved radiation grouping method is introduced to reduce the number of optimization variables in the optimization of collector system.The effectiveness of the proposed method is demonstrated using the simulation examples.The results show that the potential of tidal current energy generation can be fully excavated to improve the utilization ratio of TCF funds by quantifying the influences of the infeasible area on the tidal velocity.The case studies show that the planning scheme of TCF can evade the infeasible area and reduce the influence of the infeasible area on TCF planning.