考虑混合储能荷电状态的微网功率控制研究

Research on Microgrid Power Control Considering Hybrid Energy Storage State of Charge

因可再生能源极易受环境影响,所以在微电网中加入混合储能系统来解决微电网的稳定运行问题。在同时考虑蓄电池和超级电容荷电状态的情况下,针对混合储能系统提出了基于荷电状态(stateofcharge,SOC)和可变滤波时间常数的控制策略。首先,根据蓄电池荷电状态,对系统多模态的运行进行分析;然后,把蓄电池组的荷电状态和系统输出功率作为参考,对输出功率不足的时段进行蓄电池输出补偿,同时根据混合储能系统的荷电状态值,对滤波时间常数进行调整,使其稳定工作在合理区间。最后,仿真结果表明,所提策略能对混合储能系统的功率进行合理分配,并实现了直流母线电压的稳定。

Because renewable energy is highly susceptible to environmental impact,hybrid energy storage is added to the microgrid to solve the problem of stable operation of the microgrid.A control strategy based on the state of charge and variable filter time constant is proposed for the hybrid energy storage system considering both the state of charge of the battery and the supercapacitor.Firstly,the method analyzes the multi-modal operation of the system according to the state of charge of the battery.Then,by dividing the state of charge of the battery pack and the output power of the system as a reference,the battery output compensation is performed for the period when the output power is insufficient.According to the state of charge value,the filter time constant is adjusted to make it work stably in a reasonable range.Finally,the simulation results show that the proposed strategy can reasonably distribute the power of the hybrid energy storage system and stabilize the DC bus voltage.