基于寿命量化的混合储能系统协调控制参数优化

Optimization of Coordinated Control Parameters for Hybrid Energy Storage System Based on Life Quantization

混合储能系统控制策略中参数对控制效果具有一定影响,应量化分析其影响并进行参数优化。文中采用考虑自放电率和充放电效率等因素影响的储能系统数学模型;在基于锂电池充放电状态的混合储能系统控制策略基础上,提出超级电容储能荷电状态协调响应裕量指标;结合适用于实际不规则充放电应用的锂电池寿命量化模型,建立基于锂电池量化寿命的混合储能系统协调控制参数优化模型。算例分析表明,合理选择混合储能系统协调控制参数可延长锂电池使用寿命,进而提高混合储能系统的整体性能。

As the parameters in the control strategy for the hybrid energy storage system（HESS）have definite influence on control effect, it is advisable to make quantitative analysis and parameter optimization for this influence.A mathematical model for the energy storage system is presented with the influence of self-discharge rate and charge-discharge efficiency taken into account.A novel index named coordinated response margin of supercapacitor storage state of charge is proposed on the basis of the control strategy for HESS based on the charge-discharge state of lithium battery.A parameter optimization model for HESS coordinated control based on lithium battery quantized life is developed by referring to the lithium battery life quantization model applicable to the actually irregular charge-discharge application. An example demonstrates that rational choice of HESS coordinated control parameters can prolong the lithium battery useful life,thus improving the overall performance of HESS.