Grid Forming Inverter: Laboratory-Scale Hardware Test Bed Setup and Weak Grid Operation
Grid Forming Inverter: Laboratory-Scale Hardware Test Bed Setup and Weak Grid Operation
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并网逆变器：实验室规模的硬件测试台设置和弱电网运行
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Lingling Fan
中科院分区：
文献类型：
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作者：
Ratik Mittal;Zhixin Miao;Lingling Fan
近年来，并网逆变器的概念越来越受欢迎。电网形成逆变器已被证明是电网跟随逆变器的有前途的替代方案。在本文中，我们提出了硬件实验台实现并网逆变器在孤岛模式以及在并网模式。控制结构包括逆变器级的内电流控制和外电压控制，以及工厂级的P-f和Q-V下垂控制。Q-V下降提供电压命令，而P-f下降提供频率命令，并且也是同步过程的关键。虽然建立孤岛运行的测试平台很简单，但在并网模式下建立并网逆变器是一个具有挑战性的过程。我们介绍了关键技术，并利用硬件实验结果演示了启动过程和弱网格操作。在MATLAB/SimPowerSystems中开发的EMT模型的结果也被提出用于并排比较。
In recent times, the concept of grid forming inverters has gained popularity. Grid forming inverters have proven to be a promising alternative to the grid following inverters. In this paper, we present the hardware test bed implementation of grid forming inverter in islanding mode as well as in grid connected mode. The control structure includes inverter-level inner current control and outer voltage control, and plant-level P - f and Q - V droop control. The Q - V droop provides the voltage command, whereas P - f droop provides the frequency command and is also key for the synchronization process. While it is straightforward to set up the test bed for the islanded operation, it is a challenging process to set up the grid-forming inverter in the grid-connected mode. We present the key technologies and demonstrate the start-up process and weak grid operation using the hardware experiment results. Results from EMT model developed in MATLAB/SimPowerSystems are also presented for side-by-side comparison.