Research on adaptability of unbalanced three-phase pv after asynchronous networking

2018 International Conference of Green Buildings and Environmental Management

土木建筑工程;生态环境科学

Li, Shengnan^1 ; He, Tingyi^1 ; He, Peng^1 ; Guo, Xiaoyu^1

Electric Power Research Institute in Yunnan Electric Power Grid, NO. 105 YUNDAXI ROAD, Guandu District, Kunming Yunnan

650217, China^1

关键词: Asynchronous networks;    MATLAB /simulink;    Negative sequence components;    Output current;    Reference coordinates;    Three phase voltage;    Unbalanced condition;    Yunnan power grid;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/186/5/012011/pdf
DOI  :  10.1088/1755-1315/186/5/012011

来源: IOP

【 摘 要 】

After the asynchronous network of Yunnan Power Grid and China Southern Power Grid, the characteristics of small capacity and poor anti-disturbance capability of Yunnan Power Grid are highlighted. Changes in the power grid environment make the problem of three-phase voltage imbalance more likely to occur and may deteriorate. This paper studies the ability of photovoltaic three-phase unbalanced adaptability after asynchronous networking. A double-synchronized reference coordinate model for PV in the three-phase unbalanced condition was established. The influence of the voltage negative-sequence component of the grid on the DC voltage, output current and power of the inverter was studied. A scheme for suppressing oscillation by adding a notch filter is proposed. In Matlab/Simulink, the whole process simulation of wind turbine adaptability under three-phase unbalanced change is realized. The simulation results verify the correctness of the theoretical analysis and the effectiveness of the proposed solution.