After the PV is connected to the resistance grounded distribution line through the neutral point,the single-phase-to-ground hase grounding fault characteristics of the distribution network change significantly:the fault current on the grid side increases,and the short circuit current on the PV side is limited due to the control.Based on the control strategy of photovoltaic power station,the single-phase-to-ground hase grounding fault analysis is carried out,and the grid side and photovoltaic side three sequence current are derived by using the superposition principle and three sequence network.The fault characteristics that the photovoltaic side zero sequence current is not affected by the control strategy of photovoltaic controller,the grid side cannot detect zero sequence current,and the negative sequence current significantly increases are obtained.Matlab/Simulink simulation verifies the correctness of the fault analysis.
photovoltaicsingle-phase-to-ground faultthree sequence current
维普
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