标题：A virtual impedance based coordinated control strategy for distributed supercapacitors in DC microgrid
作者：Gao, Min ;Du, Chunshui ;Chen, Jie ;Chen, Alian ;Zhang, Chenghui
作者机构：[Gao, Min ;Du, Chunshui ;Chen, Jie ;Chen, Alian ;Zhang, Chenghui ] School of Control Science and Engineering, Shandong University, Jinan, Shandong; 25 更多
会议名称：36th Chinese Control Conference, CCC 2017
会议日期：26 July 2017 through 28 July 2017
来源：Chinese Control Conference, CCC
关键词：DC microgrid; low-bandwidth-communication (LBC); power distribution; Supercapacitor (SC); virtual impedance
摘要：Supercapacitors (SCs) are widely utilized as energy storage units (ESUs) to compensate the transient power fluctuations. In this paper, an improved virtual impedance based coordinated control strategy for distributed SCs is proposed to achieve accurate power distribution. Unlike the existed strategy which can hardly adjust the output power of each SC if the energy storage system contains several distributed SCs, the proposed control scheme can allocate the output power of each SC according to the state-of-charge (SOC) without causing current oscillations. The power distribution among each SC is realized based on low-bandwidth-communication (LBC). And power distribution coefficients which are proportional to the SOC of each SC are introduced. By appropriate tuning the coefficients, the accurate power distribution of SCs is achieved. This method can not only supply energy instantly under transient conditions caused by loads or sources, but also realize precise power distribution between SCs. Meanwhile, this coordinated control strategy which has improved reliability is simple to implement, since it only uses local controllers and LBC network to exchange information between SCs. The effectiveness of the proposed control strategy is verified by simulation results. © 2017 Technical Committee on Control Theory, CAA.