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首页> 外文会议>International Conference on Ecological Vehicles and Renewable Energies >Virtual impedance adaptation in a load emulator device for laboratory PV inverter testbed
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Virtual impedance adaptation in a load emulator device for laboratory PV inverter testbed

机译：实验室光伏逆变器测试台的负载仿真器设备中的虚拟阻抗适配

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摘要

The paper presents an adaptive virtual impedance for load emulator control to be used in an emulator-based laboratory testbed. The target platform aims to investigate the impact of nonlinear local loads on PV systems and local storage systems as solution for higher integration of PV systems into existing low-voltage networks. The platform is equipped with PV inverter with unknown LCL filter parameters and industrial grid emulator. These devises as well as the load emulator are connected to a Point of Common Coupling (PCC) via LCL filters. Their parallel operation can lead to some instability. In this paper, authors propose a simple and fast method for instability detection by defining a residual giving a low value under normal operation and higher values when instability occurs. Virtual impedance is then introduced in the load emulator control to suppress these instabilities. Its value is tuned gradually till the residual value returns lower than the threshold defined in normal conditions. This method can be applied to any LCL type inverter with proportional resonant controller. A PSIM software platform model is established and simulation results are carried out to demonstrate the effectiveness of the method.
机译：本文提出了一种用于负载仿真器控制的自适应虚拟阻抗，该阻抗将在基于仿真器的实验室测试平台中使用。目标平台旨在研究非线性局部负载对光伏系统和本地存储系统的影响，以此作为将光伏系统更高程度集成到现有低压网络中的解决方案。该平台配备了具有未知LCL滤波器参数的PV逆变器和工业电网仿真器。这些设计以及负载仿真器通过LCL滤波器连接到公共耦合点（PCC）。它们的并行操作可能会导致一些不稳定。在本文中，作者提出了一种简单快速的方法来进行不稳定性检测，方法是定义一个残差，该残差在正常操作下给出一个较低的值，而在发生不稳定性时给出一个较高的值。然后，将虚拟阻抗引入负载仿真器控制中，以抑制这些不稳定性。逐步调整其值，直到残值恢复到低于正常条件下定义的阈值为止。该方法可应用于任何具有比例谐振控制器的LCL型逆变器。建立了PSIM软件平台模型，并通过仿真结果证明了该方法的有效性。

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