Analysis of the impact of energy storage on the line protection of the collecting line in the wind-photovoltaic-storage power station

In some wind-photovoltaic-storage power station, energy storage are gathered on 35kV AC lines. The control strategy of energy storage converter will affect the fault current external characteristics of the energy storage system, and then affect the action of line protection equipment and fault removal. To solve the above problems, based on the current mainstream energy storage converter control strategy and national standards, the response of the control strategy during the relay protection operation time are analyzed. Then the fault current external characteristics of the energy storage system are obtained. The effect on the collecting line current protection is analyzed. The accuracy of the external current characteristics of the energy storage system obtained in this paper is verified by simulation. Combined with simulation, The accuracy of the analytical results are further proved by simulation, and the improvement measures of the current protection tuning scheme are proposed.