Control strategy of voltage fluctuations in DC microgrid consisting the rod pump drainage equipment in coalbed methane well

Abstract：To solve the DC bus voltage fluctuations caused by alternatively working in motoring and regenerating status of the motor driving rod pump drainage equipment in coalbed methane (CBM) well under the cyclic dynamic alternating load, a control strategy of voltage fluctuation in DC microgrid consisting the rod pump drainage equipment in CBM well was proposed.By establishing a hierarchical control structure including converters control layer, load power balance layer and bus power control layer, the control strategy achieved suppression of DC bus voltage fluctuations from three aspects of micro-source, load, and microgrid.The hierarchical control model of DC microgrid based on MATLAB/Simulink showed that the control strategy could effectively suppress the DC bus voltage fluctuations caused by the cyclic dynamic alternating load of rod pump drainage equipment in CBM well and maintain the stability of the system.

Keyword：DC microgrid;rod pump drainage equipment;voltage fluctuation;hierarchical control structure;coalbed methane well;