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Accurate oscillatory current-sharing in DC microgrids using distributed cooperative control method

机译：使用分布式协作控制方法在DC微电网中精确振荡电流共享

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摘要

In DC microgrids, if the oscillatory current is not shared among DGs, it may cause unallowable voltage distortion and overcurrent. In this paper, a distributed cooperative control scheme is introduced for DC microgrids in order to effectively share both the DC and the oscillatory components of current among DC sources. The hierarchical control method comprises four primary controllers namely voltage controller, conventional droop, oscillatory current droop and virtual conductance units, and three secondary controller units based on cooperative control principles. The primary controllers on each DG unit only use DGs' local information, while secondary controllers also require information of other DG units. In the secondary control part, firstly, via using the cooperative control, the DC current-sharing becomes accurate. Then, a novel droopbased oscillatory current-sharing controller unit is proposed in which by using the consensus method the error of oscillatory current-sharing is significantly reduced. A voltage observer, based on cooperative control is employed to compensate the inevitable voltage drop in DC microgrid, caused by droop controller. The voltage oscillation caused by oscillatory current-sharing unit is decreased through implementation of a virtual conductance signal applied to the inner current controller. The presented method is validated by a simulation with several cases.
机译：在DC MicroGrids中，如果在DGS之间不共享振荡电流，则可能导致不允许的电压失真和过电流。在本文中，引入了DC微电网的分布式协作控制方案，以有效地共享DC源之间的DC和振荡组件。分层控制方法包括四个主要控制器，即电压控制器，传统的下垂，振荡电流下垂和虚拟电导单元，以及基于协作控制原理的三个二级控制器单元。每个DG单元上的主要控制器仅使用DGS的本地信息，而辅助控制器还需要其他DG单元的信息。在二次控制部分中，首先，通过使用协作控制，DC电流共享变得准确。然后，提出了一种新颖的DRoop基于振荡电流共享控制器单元，通过使用共识方法，振荡电流共享的误差显着降低。采用基于协作控制的电压观测器来补偿由Droop控制器引起的DC微电网中的不可避免的电压降。通过施加到内部电流控制器的虚拟电导信号的实施方式降低由振荡电流共享单元引起的电压振荡。通过多种情况进行模拟验证所提出的方法。

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