考虑电压降落的虚拟阻抗在下垂控制中的应用

Consideration of the Bus Voltage of Virtual Impedance on Droop Control Study

在传统下垂控制的基础上,阐述了采用虚拟阻抗对母线电压水平的影响,提出了采用电压幅值反馈PI控制对无功功率控制环节进行改进的方法,使得逆变器出口电压先合理抬高再加入虚拟阻抗,从而很好地解决了虚拟阻抗加入后母线电压的降落问题,并通过仿真验证了所提出控制策略的有效性.

On the basis of the traditional droop control, the influence on the voltage of connected bus after introducing virtual impedance is elaborated. To solve this problem, the improvement of voltage amplitude feedback PI control strategy is proposed in the Q/V regulation part. Increasing the export voltage of inverter firstly and then introducing virtual impedance to cancel some voltage drop caused by the increase of virtual inductance can thus solve the problem of connected bus voltage drop after introducing virtual impedance. Finally, verification of the effectiveness of this strategy is brought out by Matlab simulation.