Research on Fault-Ride Through Strategy of Desert-Gobi-Wasteland New Energy Base Connected with Grid-Forming Energy Storage
In view of the remote location and weak network structure of desert-gobi-wasteland area,the transient control of grid-type energy storage in the base is usually switched to grid-following control strategy due to the influence of converter current limitation and transient stability of its control loop,and the power sources such as wind power,photovoltaic,and energy storage in the new energy bases without strong grid support are prone to become unstable due to the voltage drop,which will have a negative impact on the fault ride-through of the whole base.Based on the difference of transient control methods of converters in new energy bases,this paper analyzes and concludes that the key factors of instability of grid-following type new energy power supply and grid-constructing type energy storage(which are still controlled by grid-constructing type during the fault period)under grid faults are DC bus voltage pulsation and power angle instability.Furthermore,the calculation expressions for the maximum reactive power that can be generated by grid-following type and grid-constructing type converters within their respective stable operation ranges are derived,and a cooperative control strategy for maximum limit reactive power compensation of wind farms,photovoltaic power plants and energy storage systems under different active power output conditions is proposed to improve the fault ride-through capability of desert-gobi-wasteland new energy base.Finally,an electromagnetic transient model of the desert-gobi-wasteland new energy base is constructed based on PSCAD/EMTDC to verify the effectiveness of the proposed strategy.
desert-gobi-wasteland energy basefault ride-throughgrid-forming(GFM)controlfault characteristicsreactive power compensation
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