The inconsistency of line parameters at the outlet of distributed generator(DG) and its random output dis-turbance lead to a decrease in load power distribution accuracy of DC microgrid and grid-side voltage fluctuation. Aimed at these problems,a double-factor droop control strategy based on adaptive characteristics is proposed with the consider-ation of the transient-and steady-state of DG operation. First,the influence of line impedance is taken into account dur-ing the steady-state operation,a voltage regulation coefficient is introduced,and the steady-state component of double-factor droop coefficient is established. The exact distribution of load power can be realized when the impedance value is unknown,and the grid-side voltage can be raised to reduce the difference with the rated voltage. Second,the influence of random disturbance of DG output is considered in the transient process,and the distributed consistency iterative algo-rithm is introduced to establish the double-factor droop coefficient free component,which can quickly suppress the power disturbance and grid-side voltage fluctuation while maintaining the balanced output from DG,thus improving the system stability. Finally,a DC microgrid model is built in PSCAD,and simulation results show the effectiveness of the proposed strat-egy.
关键词
直流微电网/下垂控制/线路阻抗/随机扰动/功率均衡分配/电压波动抑制
Key words
DC microgrid/droop control/line impedance/random disturbance/balanced power distribution/voltage fluctuation suppression
维普
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