Research On Improving Wind Power Consumption Capacity By Combined Thermal Storage And Electricity Storage Control

With the increasing attention paid by the international community to energy security,ecological environment,abnormal climate and other issues,reducing fossil energy consumption and accelerating the development and utilization of renewable energy have become the general consensus and concerted action of all countries.Based on the high environmental friendliness and moderate cost of wind power,wind power has become one of the fastest growing green energy sources in the world in recent years.However,with the continuous expansion of wind power plant construction scale and the continuous increase of wind power generation on the grid,the penetration of wind power in the grid is getting higher and higher,and the impact on the grid is also growing.The operation of power supply side becomes more complex and changeable,which greatly challenges the safe and stable operation of the power grid,and seriously affects the reliable utilization and absorption of wind power.The use of energy storage technology provides an important means for power grid to enhance wind power absorption.Wind power heating and heat storage can reduce both the rate of wind abandonment and the emission of polluted gases.Battery energy storage has the characteristics of rapid response and energy bidirectional flow,which makes it of great significance for the safety and stability of future high wind power penetration power grid.Therefore,it is the focus of current research to analyze the situation of wind abandonment in power grid and explore the combined operation control strategy of multi-type energy storage for improving wind power absorption capacity.Firstly,the current research status of wind power absorption using energy storage technology at home and abroad is summarized.Based on the analysis of the output characteristics of wind power in northern China,the discarded wind power law and calculation model of discarded wind power during winter heating period in northern China are explored,and the mathematical models of heat storage tank and storage battery are established,which lays a foundation for formulating the optimal control strategy of combined control of heat storage and power storage to enhance wind power absorption capacity.Then,the application mode and control strategy of combined heat storage and power storage control to enhance wind power absorption capacity are studied.Based on the study of abandoned wind control strategy using thermal energy storage system or electric energy storage system,the effects and limitations of the abandoned wind absorption of the regenerative electric boiler and lithium battery energy storage system are analyzed,the system structure of the combined wind power absorption system with thermal storage and electric storage is explored,and the mathematical model of the combined system and the control strategy of the combined wind abandonment with thermal storage and electric storage are put forward.Finally,the optimal dispatching model of wind power absorption in the combined system is studied,the optimal control strategy of wind power absorption by combined control of heat storage and power storage is proposed.The objective function of optimal dispatching is to minimize the abandoned wind power of the system.According to the component model of the combined system,the equilibrium constraints of electric power and thermal power are established,and the inequality constraints of each components are given.A complete optimal dispatching model is established.On this basis,the genetic algorithm model is chosen to solve the problem.The effectiveness and feasibility of the proposed method are verified by comparing and analyzing the abandoned wind power and system operation cost under four scenarios,which are not considering the thermal storage-electricity storage system,only considering the thermal storage system,only considering the electricity storage system and both considering the thermal storage-electricity storage system.