电力系统保护与控制2017，Vol.45Issue(17)：43-50,8.DOI:10.7667/PSPC161379
直流微电网双向AC/DC变换器并联系统控制策略仿真研究
Simulation study for control strategy of bi-directional AC/DC converter parallel system in DC microgrid
摘要
Abstract
In order to easily expand the DC microgrid capacity and enhance the system stability, the parallel system with bi-directional AC/DC converters is adopted to realize the energy exchange between the DC microgird and the utility grid. A power sharing strategy with low voltage deviation is proposed for the parallel system. By using the average DC-line current as the global variable and introducing the integral part, the accurate power sharing between converters can be achieved without the impact from line parameters. By adding the average output voltage proportional integral control, the deviation of DC bus voltage is diminished. The impact on the power control of the parallel system by the secondary ripple current is studied. And the band-stop filter is introduced to reduce the grid-connected current distortion rate caused by the secondary ripple current and voltage. The stability of converter parallel system is analyzed and the appropriate control parameters are given. Finally, the simulation proves the effectiveness of the proposed control strategy.关键词
直流微电网/双向AC/DC变换器并联系统/功率均分/低母线电压偏移/二次纹波Key words
DC microgrids/bi-directional AC/DC converter parallel system/power sharing/low bus voltage deviation/secondary ripple引用本文复制引用
李培强,董彦婷,段克会,伍文华..直流微电网双向AC/DC变换器并联系统控制策略仿真研究[J].电力系统保护与控制,2017,45(17):43-50,8.基金项目
This work is supported by National Natural Science Foundation of China (No. 51677059).国家自然科学基金项目(51677059) （No. 51677059）
