A Min-communication Control for Grid-connected Cascaded PV Inverters

Hongyi Liu, Hua Han, Yao Liu, M. Su, Xiaochao Hou, Xin Zhang
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Abstract

A minimize communication control method is proposed for photovoltaic (PV) grid-connected systems with cascaded H-bridge inverters. In the system used in this paper, PV panel in each unit is directly connected to the input port of the local H-bridge, then the output ports of these H-bridge inverters are cascaded with each other, each PV unit works at its maximum power point (MPP) to guarantee system’s maximum power generation efficiency. With communication, the inverter that connect to the point of common coupling (PCC) is controlled as a current source to keep synchronous operation with the utility grid by regulating its output current in phase with the grid voltage. The other cascaded inverters are controlled as voltage resources and keeping self-synchronization with unity power factor (PF) by the proposed control method without any communication. Finally, the common link current drives all cascaded inverters keep self-synchronization with the grid and provide maximum power with high quality to the grid. Compare with other control methods, the proposed control method only requires one communication link, the communication cost is effectively reduced, the reliability and power quality of the system are greatly improved. Simulation test verifies the correctness and validity of the proposed control strategy.
并网级联光伏逆变器的最小通信控制
针对具有级联h桥逆变器的光伏并网系统,提出了一种最小化通信控制方法。在本文所采用的系统中,每个单元的光伏面板直接连接到本地h桥的输入端口,然后这些h桥逆变器的输出端口相互级联,每个光伏单元在其最大功率点(MPP)工作,以保证系统的最大发电效率。通过通信,连接到PCC的逆变器作为电流源,通过调节其输出电流与电网电压的相位,与电网保持同步运行。其他级联逆变器作为电压源控制,在不通信的情况下保持单位功率因数自同步。最后,共链电流驱动所有级联逆变器与电网保持自同步,并向电网提供高质量的最大功率。与其他控制方法相比,所提出的控制方法只需要一条通信链路,有效降低了通信成本,大大提高了系统的可靠性和电能质量。仿真试验验证了所提控制策略的正确性和有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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