Studies On Optimized Deployment And Advanced Control Strategies On Hybrid Energy Storage System Equipped For Large And Medium-sized Wind Farm

Compared with other available new energy resources,wind power generation has many advantages:mature techniques,wide application,low cost,and so on.Therefore,its penetration in power is increasing gradually.As the installation of wind farms escalating,frequency stability of the power system is increasingly being threaten resulting from out-of-limit of active power output by the integrated wind farm,of which power output fluctuates frequently and appears as randomly.On the other side,wind power curtailment is very common among existing wind farms due to the reverse-regulating-peak-load characteristic of wind power,which also increases the pressure of power dispatching.In recent years,many researchers have focused on this area and many effective strategies have been proposed.However,in the following aspects,such as mining the regulating ability of the battery-hydrogen combined storage system of wind farm,designing effective utilization model of resources and corresponding economic dispatching strategy in each link from the perspective of global view,there still exist lots of work to accomplish.Therefore,taking the grid-connected wind farms of large-scale as the object to be studied,the problems how to smooth the fluctuation of wind power output,and how to improve the comprehensive benefit of wind power generation by means of integration control and dispatching,are studied in depth.Furthermore,corresponding strategies and schemes are proposed,of which effectiveness and feasibility are verified through strict theoretical deduction and extensive simulation tests.In the aspect of wind farm participating regional power grid regulations,the following work has been accomplished in this dissertation:Aiming at solving the problem of fluctuation out-of-limit of wind power,a look-ahead predictive control strategy based onbattery-hydrogen hybrid storage system is proposed.On the basis of the anticipated significant fluctuation scenario of wind power in near future,adopting Model Predictive Control(MPC)and based on the objective of minimizing the gird-connected power fluctuation and energy loss and achieving the smoothest wind power output curve,a staged charge-discharge control strategy of battery-hydrogen hybrid storage system is proposed;On the basis of hybrid storage system structure adaptive to the look-ahead predictive strategy to minimize wind power fluctuation,the peak-load-regulation mechanism coming from power grid is introduced to the cost model of wind farms,and a peaking authority trading mechanism to adapt to wind farms' output uncertainty is designed.On this basis,an advanced strategy of battery-hydrogen hybrid storage system is proposed to achieve the best benefit of the wind power-battery-hydrogen integrated power generation system.Then,by means of iteration,the optimized capacity and proportion between battery and hydrogen is determined.Aiming at solving the problem that the availability of hydrogen producing units with high investment and operating cost is usually very low,a novel investment and operation mode for large-scale hydrogen producing unit is designed to realize production capacity shared among multiple sides by means of multi-investor joint venture,the methodologies regarding the accounting of operation cost,together with sharing investment cost and profit are put forward.Then,a Pareto-modified oriented optimal daily scheduling strategy of the power system containing multi-investor hydrogen producing units is proposed.In the aspect of high efficient utilization of resources during the process of wind power generation,the following work is accomplished:Aiming at the scenario that power demand and heat demand simultaneously exist,a comprehensive energy scheduling strategy taking fuel cells of combined heat and power generation into account.A novel water-electrolytic hydrogen making production model for the purpose of transferable wind power utilization is established.Based on its efficiency-power characteristics at various operation conditions,an optimal daily energy scheduling strategy of regional girds is proposed,with the benefit of the composite energy network achieving maximal.The researches above make progresses on exploring the potential of wind farms in participating the regulation of power grid side,improving the operation level of wind farm integration,and implementing the coordinated operation between wind farm and power grid.Furthermore,the achievement of this dissertation provides a novel perspective of the construction and operation mode for large-scale new energy resources utilization apparatus of public welfare nature.