Research On Cost Analysis And Value Evaluation Method Of Electrochemical Energy Storage

Under the background of the "dual carbon" goal,the construction of a renewable energy system with renewable energy sources such as wind and solar as the main body has become the top priority for energy and power development,and a high share of renewable energy generation will become a typical operating scenario for renewable power systems.Due to the uncertainty and volatility of wind power and photovoltaic,the high proportion of renewable energy access leads to increased difficulty in balancing power system electricity.As an important flexible ramping resource,energy storage has the utility of peak shaving,capacity supplement,frequency regulation backup,and delaying transmission investment,which is considered to be an essential element of the renewable power system.However,due to the high cost of energy storage,the market participation and development of energy storage is still relatively limited.On the one hand,the existing cost analysis of energy storage does not consider the impact of its charging and discharging behavior on the aging performance,making it difficult to accurately assess its cost;on the other hand,the existing capacity compensation mechanism is difficult to fully pay for the capacity support role of energy storage.As a limited capacity resource,it is also difficult to account for the capacity value of energy storage.In addition,the value of energy storage should not be measured at a single level,but should be assessed and measured comprehensively from a "system value" scale in all aspects of the power system.In this paper,the cost analysis and value assessment methods of electrochemical energy storage are studied.and a cost analysis method is established to consider the dynamic aging degradation of electrochemical energy storage,and the capacity credit is used to evaluate the capacity support role of electrochemical energy storage.On this basis,based on the system value theory,the system value of electrochemical energy storage is studied.aiming to accurately assess the contribution value of electrochemical energy storage to the system.Firstly,by introducing the parameters such as the state of health of electrochemical energy storage,the mathematical relationship between the performance parameters of electrochemical energy storage and its charge and discharge capacity is obtained,and then a refined model considering the dynamic aging degradation characteristics of electrochemical energy storage is established through the update and change of performance parameters,and the aging process of the electrochemical energy storage device is revealed and the dynamic aging degradation cost is calculated by simulating the parameter change update of the electrochemical energy storage device.Secondly,based on the cost analysis of electrochemical energy storage,capacity credit is proposed to measure the contribution of electrochemical energy storage to system adequacy,and the impact of low-carbon policies such as carbon market and renewable energy quota system on the capacity credit of electrochemical energy storage is studied.Finally,on the basis of capacity value,based on the system value theory,the all-round value of electrochemical energy storage is considered at the system level,and the system production cost model is established,and the system value of electrochemical energy storage itself is measured by the reduction of the system cost by introducing electrochemical energy storage through the difference method path of system value theory,and the impact of electrochemical energy storage on the system cost reduction is analyzed by example.