Robust Control Parameters Design of PBC Controller for LCL-Filtered Grid-Tied Inverter

Robust Control Parameters Design of PBC Controller for LCL-Filtered Grid-Tied Inverter
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LCL滤波并网逆变器PBC控制器鲁棒控制参数设计

DOI:
10.1109/tpel.2019.2963200
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发表时间:
2020-08
影响因子:
6.7
通讯作者:
Blaabjerg Frede
Blaabjerg Frede
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhao Jinping;Wu Weimin;Shuai Zhikang;Luo An;Chung Henry Shu-hung;Blaabjerg Frede

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由于无源控制(PBC)对系统参数变化和外部扰动具有很强的鲁棒性,因此在并网逆变器(GTI)中得到广泛采用。然而,对于带有 LCL 滤波器的基于 PBC 的 GTI,控制环路中存在三个阻尼增益和两个交互耦合前馈项,给工程师带来了控制器设计挑战。为了帮助电气工程师更好地设计LCL滤波GTI的PBC控制器,提出了一种新的阻尼增益设计,通过限制电网注入电流的固有稳态误差。此外,还采用状态观测器来减少传感器的数量。还解决了针对参数变化和宽电网阻抗变化的鲁棒性。所提出的控制设计策略的有效性将通过 3 kW/3 相/110 V 实验实验室设置的实验结果进行验证。
Owing to the strong robustness against system parameter changes and external perturbations, the passivity-based control (PBC) has been widely adopted in grid-tied inverter (GTI). However, for a PBC-based GTI with LCL-filter, there are three damping gains and two interactively coupled-feedforward terms in the control loop, resulting in the controller design challenge for engineers. In order to help electrical engineers to well design the PBC controller for LCL-filtered GTI, a new design of the damping gains is proposed, by limiting the inherent steady-state error of grid-injected current. Furthermore, the state observer is also adopted to reduce the number of sensors. The robustness against the parameters shift and wide grid impedance variation is also addressed. The effectiveness of the proposed control design strategy will be verified through experimental results on a 3 kW/3-phase/110 V experimental lab setup.
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