CAJ | 학술논문

以稳定直流母线电压和优化蓄电池工作过程为目的，提出了一种基于电压下垂法的直流微电网混合储能控制策略。该控制策略根据直流母线电压信息，利用超级电容快速补偿母线功率缺额的高频部分；通过蓄电池对超级电容进行能量补充，间接补偿母线功率缺额的低频部分；利用超级电容电压不能突变的特点，实现对蓄电池电流的平滑控制。控制系统以直流母线电压、超级电容电压及蓄电池荷电状态为判断条件，自动切换工作模式。实验表明，该控制策略可自动调节蓄电池和超级电容出力，维持直流母线电压在额定值附近小范围波动，有效地减小了蓄电池充放电次数，延长其使用寿命。
이은정직류모선전압화우화축전지공작과정위목적，제출료일충기우전압하수법적직류미전망혼합저능공제책략。해공제책략근거직류모선전압신식，이용초급전용쾌속보상모선공솔결액적고빈부분；통과축전지대초급전용진행능량보충，간접보상모선공솔결액적저빈부분；이용초급전용전압불능돌변적특점，실현대축전지전류적평활공제。공제계통이직류모선전압、초급전용전압급축전지하전상태위판단조건，자동절환공작모식。실험표명，해공제책략가자동조절축전지화초급전용출력，유지직류모선전압재액정치부근소범위파동，유효지감소료축전지충방전차수，연장기사용수명。
Aiming at stabilizing the DC bus voltage and optimizing the working process of the batteries, this paper presents a control strategy of hybrid energy storage systems in DC microgrid based on voltage droop method. The control strategy makes use of the ultracapacitor compensating the high-frequency components of bus power according to the DC bus voltage, indirectly compensates low-frequency components of bus power through the energy supplement of the batteries on the ultracapacitor, and takes advantage of the unable mutation characteristics of ultracapacitor voltage to achieve the smooth control of battery current. The control system can automatically switch work mode according to the conditions of DC bus voltage, ultracapacitor voltage and the state of charge (SOC) of battery. The experiments show that the control strategy can automatically adjust the output of batteries and ultracapacitor, maintain light fluctuation of DC bus voltage around rating, effectively reduce the frequency of battery charging and discharging and extend its using life.