基于预定时间一致性的直流微电网分布式协同控制

Distributed Prescribed-Time Consensus Based Cooperative Control for DC Microgrids

为解决直流微电网中分布式电源的协同控制问题,提出了一种基于预定时间一致性的微电网控制方法.首先提出一种基于预定时间控制的电流控制方法,能够实现在预先设定的时间内各分布式电源按比例输出功率,同时可以调节各分布式电源出口电压,将其恢复至额定值附近.然后通过MATLAB/Simulink建立微电网仿真系统,在不同工况下验证了所提出控制策略的有效性.最后在仿真系统中建立有限时间控制策略,并与预定时间控制策略下系统电流的电能质量与系统收敛预估时间的保守性进行比较,说明与验证了所提出的控制策略的优点.

A microgrid control method based on prescribed time control is proposed to solve the cooperative control problem of distributed energy resources(DER)in DC microgrid.First,a current control method based on prescribed time control is proposed,which can allocate the power output of each DER proportionally within a pre-defined time.Meanwhile,the outlet voltage of each distributed power supply can be adjusted to be near the rated value and the observation value can be kept at the rated value.Then,the microgrid system is simulated through MATLAB/Simulink and the effectiveness of the proposed control strategy is verified in different working conditions.Afterward,the finite-time control strategy is established in the simulated system.A comparison of the conservative power quality of the system current with the estimated time of system convergence in the scheduled-time control strategy verifies the advantages of the proposed strategy.