针对下垂控制会导致母线电压出现跌落现象这一问题,提出基于蓄电池荷电状态（SOC）的n次幂的自适应下垂控制（ADC）策略,设计充放电时的下垂系数,在下垂系数中引入蓄电池Sn及基于母线电压的下垂系数调整律,并加入超级电容功率补偿。在系统的协调运行控制策略上,以母线电压Udc和蓄电池SOC值作为控制元,设计上层协调控制模块。与传统自适应下垂控制相比,所提控制策略可升高跌落的母线电压,且当外界环境因素变化或负载变化时,蓄电池-超级电容混合储能系统能更好地维持母线电压的稳定,提高系统的抗干扰能力;且系统可在各工作模式之间平滑切换,维持母线电压的稳定。最后,在基于TMS320F28335的光储直流微网实验台上验证该控制策略的有效性。
Abstract
The introduction of droop control often leads to a drop in bus voltage. In response to this problem, an adaptive droop control （ADC） strategy based on n-th power of batteries state of charge（SOC） is proposed, in which designs the droop coefficient during charging and discharging is designed. In the droop coefficient, the batteries Sn and the droop coefficient adjustment law based on bus voltage are introduced, and supercapacitor power compensation is added. In terms of the coordinated operation control strategy of the system, the upper level coordinated control module is designed with the bus voltageUdc and batteries SOC as control elements.Compared with traditional adaptive droop control, the proposed control strategy can elevte the dropped bus voltage, and when external environmental factor or load changes, the battery-supercapacitor hybrid energy storage system can better maintain the stability of bus voltage and improve the system's anti-interference ability. Moreover, the system can smoothly switch between various working modes to maintain the stability of bus voltage. Finally, the effectiveness of this control strategy is verified on an PV storage DC microgrid experimental platform based on TMS320F28335.
关键词
直流微网 /
储能系统 /
自适应下垂控制 /
荷电状态 /
电压跌落 /
协调运行
Key words
DC microgrid /
energy storage system /
adaptive droop control /
state of charge /
voltage drop /
coordinated operation
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基金
国家自然科学基金（52167004）; 北方民族大学创新项目（YCX22119）
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