Multiobjectives Integrated Division-Summation Method for LCL-Type Three-Level Grid-Connected Inverter Considering Low-Frequency Common Mode Voltage
Year: 2024
Type: article
Abstract: The LCL-type three-level grid-connected inverter is extensively employed in photovoltaic (PV) power generation systems, which has multiple individually controlled objectives. To this end, an integrated division-summation (I-D-$\Sigma $) control strategy is proposed in this article, which can consider grid-connected current tracking, neutral-point potential (NPP) balance control, resonance suppression, and low-frequency common mode voltage (CMV), simultaneously. To compensate for the fact that the dual-division-summation (D-D-$\Sigma $) method only considers grid-connected current and resonance suppression, a virtual zero potential point is added for NPP balance control. Additionally, a low-frequency CMV estimation method based on fully connect-convolutional neural network (FC-CNN) is proposed, which perfectly avoids the unobservability of sensorless CMV. The I-D-$\Sigma $method can effectively reduce the low-frequency CMV, which is compensated by the low-frequency CMV. The effectiveness of the proposed strategy was verified through comparative experimental results.
Authors: Jiang Liu, Guobing Song, Maojun Deng, Yiming Ren, Fangbin Guo, Weizhang Song, Zechi Chen, Patrick Wheeler
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
Awards: G3807554816, G6352606452, G8672652901
OpenAlex ID: W4404410694