基于电压一致性的能源互联微网无功功率分配

Reactive Power Distribution Based on Voltage Consistency in Energy Interconnection Micro-grids

为了更高效地利用能源,文章提出一种能够独立运行的区域性能源互联微网结构,其针对微网内交流线路阻抗不一致导致的微源输出电压偏差问题,采用分布式平均电压一致性算法提高无功功率分配精度;通过对并网逆变器下垂控制电压给定值进行二次调节,使各微源无功功率按容量比例分配且输出电压趋向一致。相比于集中式控制,分布式控制不使用中央控制器,可提高系统的协调性和可靠性。通过建立Matlab/Simulink仿真模型对能源互联微网运行性能进行验证,结果证明了该分布式控制策略的有效性。

To further improve energy utilization efficiency,a regional energy interconnection micro-grid structure with independent operation is proposed.In micro-grid,output voltage deviation of distributed generations is caused by inconsistent impedance of alternating current line.An algorithm of distributed average voltage consistency is used to improve the accuracy of reactive power distribution.It can distribute reactive power according to the ratio of distributed generation capacity by secondary adjusting the droop control voltage of the grid-connected inverter,so as to ensure the same output voltage of each distributed generation.Compared with centralized control,distributed control does not use a central controller,which can improve the coordination and reliability of the system.A simulation model was established using Matlab/Simulink,and the operation performance of the energy interconnection micro-grid was simulated and verified,which proved the effectiveness of the distributed control strategy.