光储直流微网混合储能控制策略研究

混合储能相较于单一储能可以更好地解决微电网电压、频率波动等问题。为了充分利用混合储能系统的优势，使各储能电池优势互补，并考虑到储能变换器弱阻尼、低惯性的特点，提出了基于虚拟直流发电机控制的混合储能单元分频控制策略。该控制策略在混合储能单元分频控制的基础上，对功率密度电池储能变换器采用虚拟直流发电机控制，以增大功率密度型储能的阻尼和惯性，提升直流母线电压的动态稳定性。为验证其有效性，在微源变化和负荷波动2种工况下与传统下垂控制进行仿真对比分析，结果表明所提策略可使母线电压的波动范围限制在±0.75%以内，增强了系统的鲁棒性和稳定性并优化了储能单元的充放电性能。

Hybrid Energy Storage Control Strategy of Optical Storage DC Microgrid

Compared with single energy storage， hybrid energy storage can solve the voltage and frequency fluctuation of microgrid better. In order to make full use of the advantages of hybrid energy storage system and make each battery complementary， the paper proposes a frequency division control strategy of hybrid energy storage unit based on virtual DC generator control by considering the characteristics of the weak damping and low inertia of energy storage converter. Based on the frequency division control of the hybrid energy storage unit， the virtual DC generator is used to control power density battery energy storage converter， increasing the damping and inertia of the power density battery energy storage and improving the dynamic stability of DC bus voltage. Finally， the proposed strategy is compared with the traditional droop control under both micro source change and load fluctuation conditions， and the simulation results show that the fluctuation range of the bus voltage is limited within ±0.75% by using the proposed strategy， enhancing the robustness and stability of the system and optimizing the charge-discharge performance of the energy storage unit.