| As an important way of energy storage,electrochemical energy storage has more extensive application and broader prospects in power system.As a hot point of current research,electrochemical energy storage is still not perfect in the detection of in/off the grid operation,and there is a gap in the evaluation method of integrated performance of energy storage system.In response to these deficiencies,this paper studies in/off grid detection methods and evaluation methods.of the electrochemical energy storage.First,the composition and structure of electrochemical energy storage system are researched and analyzed.Taking Z energy storage system as an example,the parameters,topological structure,control strategy and implementation of converter in energy storage system are analyzed to be the foundation of getting the energy storage system operating parameters.Then based on the structure and operation requirements of electrochemical energy storage system,referring to the existing technical regulations,a total of thirteen indicators were extracted to form a comprehensive evaluation system of energy storage system,and then the correlation between each indicator was analyzed.Using the cone analytic network process finally obtained the weight of each evaluation index and then the rationality of the calculation results was analyzed.After removing the index of weight 0,taking a 500kW/600kWh energy storage unit of a lithium iron phosphate battery energy storage system as an example,based on the existing test methods,the energy storage system comprehensive performance evaluation system was studied and summarized Including specific measures such as the capacity of the energy storage system and charging and discharging efficiency,charging and discharging conversion time of the energy storage system,power control capability of the energy storage system,adaptive capacity of the power grid,low voltage ride through and anti-islanding effect and protection features.Finally came to the conclusion. |
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