自适应高通滤波下垂控制的孤岛直流微电网功率分配控制

Power distribution control of an island DC microgrid based on adaptive high-pass filter droop control

直流微电网孤岛运行时,由于不匹配线路阻抗及本地负荷因素的影响,传统“电压-功率”下垂控制难以使得各分布式电源按照下垂系数精确分配负荷功率。提出了一种基于自适应高通滤波下垂控制的孤岛直流微电网功率分配控制策略。通过在分布式电源下垂控制中引入采样保持器,根据采样保持器输出结果不断自适应地修改下垂系数,进而减小分布式电源实际输出功率与期望输出功率的偏差,同时高通滤波控制也有效提高了母线电压质量。最后基于RTDS仿真平台搭建不同工况下的实验模型,实验结果验证了所设计控制策略的有效性。

For the islanded DC microgrid,it is difficult for the traditional"voltage-power"droop control to make the distributed generation to supply the load power accurately according to the droop coefficient.This is because of the unmatched line impedances and local loads.An island DC microgrid power allocation control strategy is proposed by using adaptive high-pass filtering droop control.By introducing the sample-and-holder,the droop coefficient is modified when the actual output power of DG deviates from the expected output power.At the same time,the high-pass filter control guarantees good bus voltage quality.Finally,based on the platform of RTDS,an experimental scheme under different working conditions is designed and the results verify the effectiveness of the proposed control strategy.