直流微电网自适应两阶段下垂控制方法

Adaptive Two-Stage Droop Control Method for Islanded DC Micro-grids

提出了一种适用于孤岛直流微电网的自适应两阶段下垂控制方法。在下垂方程中增加时滞前馈环节,能够使直流微电网中各分布式电源满足等微增率运行,同时实现自适应的直流母线电压恢复,从而保障系统的安全经济运行。通过小干扰稳定分析不同控制参数对系统稳定性的影响,并针对无通信和分布式通信两种运行状态,提出了不同的即插即用策略,进一步提高系统的鲁棒性和可靠性。最后,仿真验证了自适应下垂控制方法的有效性。

An adaptive two-stage droop control method is proposed for islanded DC micro-grids.A time-delay feedforward path is deployed in the droop relation,through which the system can maintain economic operation by meeting the equal incremental cost principle while restoring the DC bus voltage adaptively at the same time.Detailed small-signal analysis is conducted to illustrate the impacts of different control parameters on system stability.In addition,two plug-and-play strategies are presented to enhance the system robustness and reliability,one with full autonomy and one with distributed communication.Finally,the simulation results verify the effectiveness of the proposed control method.