基于理想电流的直流微电网自调节下垂控制

针对直流微电网传统的下垂控制微源间功率分配不均和直流母线电压偏移等问题,提出了一种基于理想电流的自调节下垂控制,通过低速通信网络建立微源间的信息传递,联合调整下垂曲线系数法与平移下垂曲线法使系统具有更高的自由度和更好的调节性能,下垂系数随公共负载、线路阻抗和本地负载的变化迅速响应而自动调节,提高微源功率分配精度的同时改善了直流母线电压质量。最后在Matlab/Simulink中搭建两台变换器并联运行的试验模型,对基于理想电流的自调节下垂控制分别在低速通信网络通信通道故障和本地负载不平衡的工况下进行试验验证,其结果证明了该控制方法的可行性与有效性。

Self-adjustable Droop Control of DC Microgrid Based on Ideal Current

For the conventional droop control of DC microgrid, the problem of uneven power distribution between the micro sources and the DC bus voltage deviation is solved. This article puts forward an ideal current based self-adjustable droop control. The information transmission of micro source was established through low-bandwidth communication networks (LBCN). The joint adjustment droop curve coefficient method and translational droop curve method were used to make the system having a higher degree of freedom and better regulation performance. The droop coefficient quickly responded to the change of public load, local load and line impedance, and adjusted automatically, which improves the precision of the micro source power allocation and the quality of the DC bus voltage. Finally, an experimental model of parallel operation of two converters was built in MATLAB/simulink to test and verify the ideal current-based self-adjustable droop control under the conditions of LBCN communication channel failure and local load imbalance. The experimental results proved the feasibility and effectiveness of the control method.