直流微电网一致性简捷均功控制

Concise Power-sharing Control of DC Microgrid Based on Consistency Algorithm

多源均功、电池荷电状态均衡和直流母线电压稳定是直流微电网多源并联控制的3个重要研究问题,相互间存在紧密联系和多重约束。利用稀疏通信在相邻变换器间仅共享电流信息,以局部变量信息观测出全局平均电流和电压,降低通讯量和计算量。将观测均值作为反馈分别增设电流和电压二次调节器,并在下垂环节和电流二次调节中增加荷电状态收敛函数,使负荷电流随着荷电状态的动态均衡而实现合理分配。最后,实验表明该策略在仅通信电流信息情况下实现了直流微电网的荷电状态均衡、功率分配及直流母线电压稳定的三大控制目标。

Multi-source power-sharing,state-of-charge(SOC)equalization of battery and DC bus voltage stability are three important research topics in the field of multi-source parallel control of DC microgrid,which are closely related to each other and constrained by multiple factors.In this paper,only the current information is shared between adjacent converters through the sparse communication,and the global average current and voltage are observed based on the local variable information,thus reducing the communication and calculation loads.The current and voltage secondary regulators are added respectively with the observed mean value as feedback.In addition,the SOC convergence function is added to the droop link and current secondary regulation,so that the load current can be reasonably distributed with the dynamic equilibrium of SOC.Finally,experimental results show that under the condition of only communicating the current information,the proposed strategy realizes three control objectives for DC microgrid,i.e.,equilibrium of SOC,reasonable power distribution and DC bus voltage stability.