CAJ | 학술논문

在直流微网中没有无功功率流动，母线电压是衡量系统稳定和功率平衡的重要指标。针对没有大电网支撑的孤立微网存在的直流母线电压随着微网中分布式电源的间歇性波动和负载变化而波动或小范围突变，从而影响挂接在母线上的设备和负载稳定供电这一问题，构建了一种基于储能的孤立直流微电网系统，通过对蓄电池的充放电控制来抑制和消除直流母线电压波动，并对运行中出现的分布式电源输出波动和负载变化等情况进行了仿真实验。结果表明，直流微网孤立运行模式下，采用该控制策略的微电网能有效抑制外界环境变化带来的可再生能源功率输出的波动，向用户供应稳定的电力。
재직류미망중몰유무공공솔류동，모선전압시형량계통은정화공솔평형적중요지표。침대몰유대전망지탱적고립미망존재적직류모선전압수착미망중분포식전원적간헐성파동화부재변화이파동혹소범위돌변，종이영향괘접재모선상적설비화부재은정공전저일문제，구건료일충기우저능적고립직류미전망계통，통과대축전지적충방전공제래억제화소제직류모선전압파동，병대운행중출현적분포식전원수출파동화부재변화등정황진행료방진실험。결과표명，직류미망고립운행모식하，채용해공제책략적미전망능유효억제외계배경변화대래적가재생능원공솔수출적파동，향용호공응은정적전력。
Due to DC micro-grid having no reactive power flow, the bus voltage is an important in-dex of system stability and power balance.The DC bus voltage of isolated micro-grid without large power grid's support will fluctuate or mutate with the changes of load, intermittent fluctuation of dis-tributed generation, thus having a great influence on the devices which connected to the bus and the stability of power supply.To solve this problem, an isolated DC micro-grid system based on energy storage was constructed by controlling charge/discharge of storage battery to smooth and inhibit DC bus voltage fluctuation.Experiments on the situation of the distributed power supply output fluctua-tions and load changes were carried out, and the result shows that the micro-grid adopting the control strategy can effectively inhibit the fluctuations of renewable energy power because of environmental change, and supply stable power to the users.