SMES/BESS储能变流器在微电网中的控制策略研究  

Research on Control Strategy of SMES/BESS Energy Storage Converters in Microgrid

作　　者：林晓冬 雷勇[1] LIN Xiaodong;LEI Yong(School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, Sichuan Province, China)

机构地区：[1]四川大学电气信息学院

出　　处：《电网技术》2018年第5期1458-1466,共9页Power System Technology

摘　　要：储能系统在微电网的运行控制中起到了重要的作用,研究了超导磁储能和蓄电池储能系统的储能变流器在微电网中的控制策略。基于比例积分（proportional-integral,PI）控制的储能变流器已广泛应用于微电网中,以实现双向的功率传输。然而,由于储能变流器具有高度的非线性和耦合性,PI控制器无法实现令人满意的鲁棒性。因此提出了一种基于互联和阻尼配置方法的能量成型控制策略,用于改善微电网中混合储能系统储能变流器的鲁棒性。具体设计过程包括3个步骤：端口受控哈密尔顿模型的建立、期望平衡点的设定和能量匹配方程的求解。最后,为验证所提出方法的正确性和有效性,建立了微电网模型进行并网、孤岛运行的仿真。仿真结果表明,所提出的HESS储能变流器的能量成型控制策略在微电网各运行状态下均能有效维持微电网稳定运行,并较传统的PI控制有更强的鲁棒性。Energy storage system plays an important role in operation and control of microgrid. Control strategies of converters of superconducting magnetic energy storage（SMES） system/battery hybrid energy storage system（HESS） in microgrid are studied in this paper. Energy storage converters are widely used in microgrid for achieving bidirectional power transmission based on proportional-integral（PI） method. However, PI controllers are not satisfactory in robustness due to high nonlinearity and coupling characteristics. Thus, this paper proposes an energy shaping（ES） control based on interconnection and damping assignment（IDA） to improve robustness of HESS converters in microgrid. Design process includes three steps： construction of port-controlled Hamiltonian（PCH） model, setting of desirable equilibrium and solution of energy matching equation. Finally, to verify effectiveness of the proposed method, a microgrid model is built for simulation of grid-connected and islanded operation. Simulation results show that the proposed ES control can effectively achieve stable operation of microgrid in all operating states and stronger robustness than conventional PI control.

关 键 词：微电网 储能变流器 超导磁储能 蓄电池储能 端口受控哈密尔顿 能量成型控制 

分 类 号：TM74[电气工程—电力系统及自动化]