考虑容量差异的多储能SOC均衡控制策略

Multi-energy SOC balancing control strategy considering capacity difference

孤岛式直流微电网系统需要配置多组DESUs,以应对不同的负荷需求和能源波动。考虑DESUs具有不同容量时,由于线路中阻抗不匹配,SOC均衡效果受到严重影响,为此,提出一种考虑不同容量的多储能SOC均衡控制策略。首先,通过含加速因子的指数函数建立SOC与下垂系数之间的关系,提升下垂系数对SOC均衡后期变化的灵敏性,实现下垂系数的自适应调节。各DESU仅通过稀疏通信网络与邻居节点交换状态信息,并采用动态一致性算法获取全局平均状态信息。设计一种多目标控制器,其能够在补偿母线电压跌落的同时实现负荷功率的准确分配,消除不匹配线阻的影响,减少控制流程,减轻系统通信负担。最后,基于MATLAB/Simulink软件搭建了仿真模型,并在各种复杂工况下证实了所提控制策略的有效性。

Islanded DC microgrid systems need to be configured with multiple DESUs to cope with different load demands and energy fluctuations.Considering DESUs with different capacities,the SOC balancing effect is seriously affected due to the impedance mismatch in the line;for this reason,a multi-storage SOC balancing control strategy considering different capacities is proposed.Firstly,the relationship between SOC and the droop coefficient is established by an exponential function containing an acceleration factor,which improves the sensitivity of the droop coefficient to the late change of SOC balancing and realizes the adaptive adjustment of the droop coefficient.Each DESU only exchanges state information with neighboring nodes through a sparse communication network and adopts a dynamic consistency algorithm to obtain the global average state information.A multi-objective controller is designed,capable of compensating bus voltage dips while achieving accurate distribution of load power,eliminating the effect of mismatched line resistance,reducing the control process,and alleviating the system communication burden.Finally,a simulation model is built based on MATLAB/Simulink software,and the effectiveness of the proposed control strategy is confirmed under various complex operating conditions.