In this paper, a self-adjusting nominal voltage based modification in the $Q-V$ droop control has been proposed to improve the reactive power sharing amongst distributed generation sources in an islanded microgrid. This is achieved by coupling the nominal voltage calculation with the system frequency, which has an effect of driving the voltage references of all the distributed generators in such a manner so as to improve the network-wide reactive power sharing. An appreciable improvement in reactive power sharing is achieved by using adaptive nominal voltage as compared to fixed nominal voltage. The proposed method neither depends on data exchange among sources nor does it need feeder impedance information. In addition, it is able to improve the sharing in cases of loads located locally or at a distance. The improvement in reactive power sharing does not compromise on voltage magnitude. The viability of the controller has been confirmed from detailed simulation studies and experimental validation on a laboratory prototype.

中文翻译：

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一种自我调节的下垂控制策略，可改善孤岛微电网的无功功率共享

本文基于自调整标称电压的修改 $ QV $已经提出了下垂控制以改善孤岛微电网中的分布式发电源之间的无功功率共享。这是通过将标称电压计算与系统频率耦合来实现的，这具有驱动所有分布式发电机的参考电压的方式，从而改善了整个网络范围内的无功功率共享。通过使用自适应标称电压与固定标称电压相比，可实现无功功率共享的明显改善。所提出的方法既不依赖于源之间的数据交换，也不需要馈线阻抗信息。此外，如果负载位于局部或远处，则可以改善共享。无功功率共享的改善不会影响电压幅度。