低压微网孤岛模式下改进的下垂控制策略

Improved droop control strategy for island low-voltage microgrid

针对多台分布式电源并联孤岛运行时,使用传统的下垂控制策略存在功率振荡以及受负荷波动影响较大等问题,提出了一种基于简化情感智能控制器的低压微网P-V下垂控制策略,功率控制中引入自调节下垂系数环节,电压外环控制中引入具有参数自学习能力的简化情感控制器。结果表明,与传统下垂控制方式相比,基于简化情感智能控制器的低压微网P-V下垂控制策略可以更好地实现系统功率的准确均分,抑制功率振荡和减少负荷变化带来的电压波动,提高系统的动稳态性能。

When parallel-connected DGs run in islanding mode the problems of power oscillation and voltage fluctuation arise by using the traditional droop control strategy. A P-V droop control strategy based on the simplified emotional intelligent controller which used in the low-voltage microgrid is proposed. The simplified emotional intelligent controller which had the ability of parameter self- learning is applied in outer voltage loop while droop coefficient self-regulating section is introduced into the part of power control. In the simulation, comparing with the traditional droop control strategy, the proposed control strategy can make load distribution more accurate and can restrain power oscillation and voltage fluctuation which give a better dynamic and static performance of system.