直流微电网多储能并联电压和功率共享控制方法研究

Research on voltage and power sharing control method of multi-energy storage parallel connection in DC microgrid

针对多储能单元并联的孤岛直流微电网功率分配精度和电压降落问题,本文提出了一种包括电压偏移和下垂斜率调整的分层分布式控制方法。该方法可以实现储能单元精确功率共享和直流母线电压自恢复,弥补了下垂控制均流精度差、电压偏差大的缺点。通过增加偏移电压和调节下垂增益,可以有效地补偿下垂控制器引起的电压降落。无论负载如何变化,直流母线电压始终可以自动调整。此外,本文还详细介绍了控制器的设计过程,并证明了系统的稳定性。最后,通过仿真和实验验证了该控制方法的有效性和优越性。

Aiming at the power distribution accuracy and voltage drop problems of islanded DC microgrids with multiple energy storage units in parallel,a hierarchical distributed control method including voltage offset and droop slope adjustment is proposed in this paper.The method can realize accurate power sharing of energy storage units and self-recovery of DC bus voltage,and make up for the shortcomings of poor droop control current sharing accuracy and large voltage deviation.The voltage drop caused by the droop controller can be effectively compensated by increasing the offset voltage and adjusting the droop gain.Regardless of load changes,the DC bus voltage can always be adjusted automatically.In addition,the paper also introduces the design process of the controller in detail and proves the stability of the system.Finally,the effectiveness and superiority of the control method are verified by simulation and experiment.