Optimization Of Coal Inventory Management Of Power Plants Under Large-scale Wind Power Integration

In recent years,China’s wind power installed scale continues to expand,and the grid-connected capacity continues to grow,showing a large-scale grid-connected situation.At the same time,in order to promote the consumption of wind power,many places have implemented the preferential power generation and purchase system,which means that the living space of coal-fired power plant has decreased.But for a long time to arrive,coal-fired power generation will remain indispensable in China.Based on this,coal-fired power plant will face the dilemma of repositioning and planning development on the one hand;on the other hand,they will deal with the problems of thermal power unit upgrading and transformation and break through the technical problems of clean and efficient.Therefore,in the face of external living space compression and internal energy transformation requirements,it has become an inevitable trend for coal-fired power plant to strengthen production and operation management,reduce costs and increase efficiency.However,when the existing literature studies the operation and management of coal-fired power plant,it does not take into consideration the impact of external changes such as wind power integration on plant operation.Based on this background,this paper studies the optimization of coal inventory management of power plant under large-scale wind power integration,aiming to provide the optimal economic benefit scheme for the production management of coal-fired power plant.Firstly,the theoretical knowledge of wind power integration and coal inventory management is sorted out in this paper.Secondly,according to the output fluctuation characteristics in wind power integration,and the uncertain output model of wind power based on light robust optimization is constructed.Based on this,comprehensively considering the current situation of the implementation of power transfer in the electricity market,a coal inventory management model for power plant under uncertain wind power integration is established.Inventory deviation and bullwhip effect are used to measure inventory changes.Finally,coal-fired power plant A is taken as an example to verify the effectiveness of the model through an actual calculation example,and the following conclusions are drawn:(1)In the production and operation of coal-fired power plant,decision-makers should fully consider the interaction among generation cost,electricity purchase cost,and electricity lack penalty cost,and make the optimal trade-off.(2)After the large-scale wind power integration,because of the wind power output uncertainty,there are errors in output forecasts,which further biases the power demand information of coal-fired power plant.The plant usually produces more power to deal with the uncertainty,this made the bullwhip effect strengthen in the coal supply chain.At the same time,the total operation cost of coal-fired power plant has increased.(3)The participation of coal-fired power plant in the "power transfer" mechanism can not only effectively reduce the inventory level of plant,save inventory management costs and wastage costs,but also contribute to the orderly operation of the coal-fired power plant and alleviate the impact caused by the bullwhip effect.This paper mainly realizes the innovation of related theories and methods from two aspects of research background and model construction.Firstly,from the perspective of problem background,this paper expands the literature on coal inventory management of traditional thermal power plants and considers the optimization of coal inventory management of coal-fired power plants under the large-scale wind power integration.At the same time,a"power transfer" strategy is introduced to reduce the operating cost of coal-fired power plants.The influence of external wind power grid integration and power supply strategy on the production and operation of coal-fired power plants is studied.Secondly,from the perspective of model construction,the impact of the uncertainty of wind power output on the inventory level of the coal-fired power plant is considered for the first time.The optimization model of inventory management of coal-fired power plants under the uncertain wind power integration is constructed.The model overcomes the problem of traditional conservative wind power output and allows the existence of some wind abandonment phenomenon,which makes the model more suitable for the actual decision-making environment.