摘要
针对分布式电源出力间歇性与负载多变性的问题,储能成为直流微电网电压支撑与改善电能质量的重要途径.为了充分利用混合储能系统的优势,实现功率的合理分配,提出了一种适用于混合储能系统的功率自主分频控制方法,该方法通过在各储能单元下垂控制环中引入虚拟阻感或虚拟电容,重塑各变换器的等效输出阻抗值,从而实现了超级电容和蓄电池的优势互补.在负荷突变时,超级电容能快速吸收系统功率波动的高频部分,提高系统的动态响应;蓄电池则主要用来平衡系统功率波动的低频部分,延长蓄电池的使用寿命,从而保证系统稳定可靠运行.仿真验证了所提方法的正确性.
In view of the intermittent distributed power output and load variability,energy storage becomes an important way to support DC microgrid voltage and improve power quality. In order to make full use of the advantages of hybrid energy storage to achieve reasonable power distribution,an autonomous-frequency-split power control strategy for hybrid energy storage is proposed. In this method,the equivalent output impedance of converters is reshaped by introducing the virtual impedance or virtual capacitor in the droop control. By this way,the advantages of supercapacitor and battery can be integrated. At the load mutation,supercapacitor rapidly absorbs the high-frequency component of power fluctuation to improve the dynamic respond speed. Meanwhile,battery is mainly used to balance the low-frequency power in order to extend the service life and ensure the reliable operation of system. The simulation verifies the correctness of the proposed method.
引文
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