Abstract
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.
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