孤岛直流微电网稳定控制策略研究

Research on Stability Contronl Strategy of Islanded DC Microgrid

直流微电网因其控制目标较单一、便于可再生能源接入以及满足用户直流用电需求等特点而受到越来越多的关注。本文针对直流微电网的电压稳定与功率平衡问题,设计了一种基于残差的扰动抑制策略,并在此基础上设计孤岛直流微电网上层能量管理策略。首先搭建孤岛直流微电网架构,设计底层控制结构,基于全维状态观测器以及残差信息设计扰动补偿控制器。其次根据蓄电池的SOC设计上层能量管理策略,保证系统的功率平衡。最后在PSCAD/EMTDC中搭建仿真模型对仿真结构与能量管理策略进行验证,结果表明本文设计的上层能量管理策略能够有效保证直流微电网电压的稳定与功率平衡。

DC microgrid has attracted more and more attention due to its simple control target, easy access to renewable energy sources and meeting the DC power demand of users.Aiming at the voltage stability and power balance of DC microgrid, this paper designs a disturbance suppression strategy based on residual error, and then designs an upper layer energy management strategy of islanded DC microgrid on this basis.Firstly, the architecture of islanded DC microgrid is built, the underlying control structure is designed, and then the disturbance compensation controller is designed based on the full-dimensional state observer and residual information.Then the upper level energy management strategy is designed according to the SOC of the battery to ensure the power balance of the system.Finally, the simulation model is built in PSCAD/EMTDC to verify the simulation structure and energy management strategy.The verification results show that the upper layer energy management strategy designed in this paper can effectively ensure the voltage stability and power balance of DC microgrid.