Photovoltaic inverter outlet line series arc detection method and system

The invention discloses a photovoltaic inverter outlet line series arc detection method and system, and the method comprises the steps: inputting inverter outlet line current and cable parameters through an established photovoltaic inverter outlet line series arc model under a DC component, obtaining a numerical relation between arc resistance and cable resistance under the action of the DC component; therefore, an inverter outlet line series arc detection criterion is formed. By inputting the line current, the inverter outlet voltage and the network side voltage in the inverter data acquisition device, the series arc of the inverter outlet line can be detected, and the problems that the current photovoltaic power station cable operation and maintenance mode is time-consuming and labor-consuming, and the cable series arc detection blind area exists are solved. 本发明公开了光伏逆变器出口线路串联电弧检测方法及系统，本发明通过所建立的直流分量下的光伏逆变器出口线路串联电弧模型，输入逆变器出口线路电流及电缆参数，得出直流分量作用下的电弧电阻与电缆电阻数值关系，由此形成逆变器出口线路串联电弧检测判据。通过输入逆变器数据采集装置中的线路电流、逆变器出口电压及网侧电压