DC microgrid,known for its strong controllability,low system loss,and elimination of reactive power concern,has become increasingly popular for oilfield wellsite application.However,the voltage fluctuation of the DC bus,arising from the large-scale integration of distributed power source and the specific operational characteristic of wellsite load,presents a significant challenge to the development of DC microgrid in oilfield wellsite.The research on coordinated control strategy for distributed power source,AC grid,pumpjack load,and energy storage device was carried out based on shared DCbus power supply system structure of oilfield wellsite.A coordinated optimization control strategy was proposed for the power generation,transmission,loading,and storage system,which integrates maximum power point tracking for photovoltaic system,adaptive control strategy for pumpjack load,and bus voltage droop-based coordination control strategy for energy storage and grid.By considering DC bus voltage,battery state of charge,load operation level,and distributed power output,the charging and discharging strategies of grid and energy storage were adjusted in real time,as well as the operation of pumpjack load,to maintain the DC bus voltage within a stable range.The strategy promotes the consumption of new energy while meeting the electrical load demand of oilfield wellsite.The simulation model was established in MATLAB/Simulink software to verify the effectiveness of the control strategy.Additionally,the small-signal stability of system was verified based on the eigenvalue distribution result of system,in combination with small-signal stability analysis.
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