This paper presents a novel robust current droop controller (RCDC) using a single droop loop. This scheme is unified supporting dual mode of operation for micro-grids (MGs), including grid connected mode (GCM) and islanded mode (ISM) while ensuring seamless transition between the two modes with proportional power sharing maintained. The proposed controller is further incorporated with an improved maximum power point tracking (MPPT) technique presented for the parallel operation of single-stage inverters fed by multi-string PV array topology. In addition, an improved phase-locked-loop-less (PLL-less) method is presented supporting self-synchronization strategy of the parallel operation of PV-inverters with the main grid while maintaining the full capabilities of the unified control architecture. This obviates the usage of conventional PLLs, which are widely used with active synchronization techniques. The performance of the proposed control scheme is validated using real time simulations (RTS) developed by dSPACE MicroLabBox.

中文翻译：

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一种新型光伏单级逆变器并网孤岛运行统一控制器


本文提出了一种使用单下垂环路的新型鲁棒电流下垂控制器 (RCDC)。该方案统一支持微电网（MG）的双运行模式，包括并网模式（GCM）和孤岛模式（ISM），同时确保两种模式之间的无缝过渡，并保持比例功率共享。所提出的控制器进一步与改进的最大功率点跟踪（MPPT）技术相结合，该技术用于由多串光伏阵列拓扑供电的单级逆变器的并行操作。此外，提出了一种改进的无锁相环（PLL-less）方法，支持光伏逆变器与主电网并行运行的自同步策略，同时保持统一控制架构的全部功能。这就避免了使用传统 PLL，而传统 PLL 广泛用于主动同步技术。使用 dSPACE MicroLabBox 开发的实时仿真 (RTS) 验证了所提出的控制方案的性能。