基于阻抗源变换器的光伏直流升压汇集系统

发布时间：2018-06-29 02:44

本文选题：直流光伏电站 + 直流升压汇集　；参考：《电力系统自动化》2017年15期

【摘要】：针对大型光伏电站直流升压汇集技术挑战,提出一种计及阻抗网络概念的新型光伏直流升压汇集系统解决方案。该方案以一种阻抗型多模块串联式直流升压变换器为核心,具备多路最大功率点跟踪(MPPT)与高增益升压变流一体化功能,从而无需低压直流母线与专用MPPT装置,结构清晰可靠,便于内部故障隔离与整站动态控制。阻抗网络的引入,一方面具备灵活调压能力,可有效地解决输入光伏阵列间功率不均衡问题,具备良好运行适应性;另一方面具备抵御直通短路故障能力,可以大幅度提升电力电子系统运行可靠性。详述了系统架构、核心直流升压变流器拓扑、工作原理与控制方法。针对光伏阵列输出功率均衡与不均衡两种典型工况,对该系统进行仿真验证。仿真结果表明所述理论分析正确可靠,该系统对于未来直流光伏电站的推广应用具备潜在应用价值。
[Abstract]:In view of the technical challenge of DC boost collection in large-scale photovoltaic power plants, a new type of PV DC boost collection system is proposed, which takes into account the concept of impedance network. This scheme is based on an impedance multi-module series DC boost converter, and has the function of multi-channel maximum power point tracking (MPPT) and high gain boost converter, so that there is no need for low-voltage DC bus and special MPPT device, and the structure is clear and reliable. It is convenient for internal fault isolation and whole station dynamic control. With the introduction of impedance network, on the one hand, it has the ability of flexible voltage regulation, which can effectively solve the problem of power imbalance between input photovoltaic arrays, and has good operational adaptability; on the other hand, it has the ability to resist through short circuit fault. The reliability of power electronic system can be greatly improved. The structure of the system, the topology of the core DC boost converter, the working principle and the control method are described in detail. The system is verified by simulation aiming at two typical conditions: balanced and unbalanced output power of photovoltaic array. The simulation results show that the theoretical analysis is correct and reliable, and the system has potential application value for the future application of DC photovoltaic power station.
【作者单位】：上海交通大学电子信息与电气工程学院;中国电力科学研究院;
【基金】：国家自然科学基金资助项目(51477102) 国家电网公司科技项目“大型光伏电站直流升压汇集接入关键技术及设备研制”~~
【分类号】：TM46;TM615

【参考文献】