Work

Investigation on Efficient Coordinated Control of String‐Type PV Optimizers Under Irradiation Imbalance

Year: 2025

Type: article

Abstract: ABSTRACT In grid‐connected photovoltaic (PV) systems, string‐type PV optimizers can realize maximum power point tracking (MPPT) based on the characteristics of single PV panels under irradiation imbalance, so as to improve the energy utilization rate of PV panels. However, the power loss of the PV optimizers cannot be ignored. Meanwhile, the coordinated start/stop control of PV optimizers with PV inverters deserves further investigation. In this paper, a high‐efficiency coordinated control method for grid‐connected PV system is proposed. Based on the operating modes and loss of both PV optimizers and inverters, the optimal operating mode of PV optimizers under different irradiation conditions is obtained, especially in case of irradiation imbalance of PV panels. The proposed method also realizes higher reliability and lower power loss in the coordination of the first and second stages of the PV system with the control logic design during the starting, stopping, and fault cases. Experiments are carried out with three 700 W string‐type PV optimizers, and the results verify that the proposed method realizes higher conversion efficiency and reliability under different operating cases.

Source: IET Power Electronics

DOI: 10.1049/pel2.70096

Authors: Wenzheng Xu, Yuhao Peng, Jiangang Liang, Ning Chen, Jingdou Liu, Fen Tang

Institution: Beijing Jiaotong University

Language: English

Topic: Photovoltaic System Optimization Techniques

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $2,880