| 引用本文: | 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.[点击复制] |
| LI Peiqiang,DONG Yanting,DUAN Kehui,WU Wenhua.Simulation study for control strategy of bi-directional AC/DC converter parallel system in DC microgrid[J].Power System Protection and Control,2017,45(17):43-50[点击复制] |
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| 摘要: |
| 为了便于扩展直流微电网的容量与增强系统可靠性，采用双向AC/DC变换器并联系统来实现直流微电网与大电网之间的能量交互。提出了一种直流微电网双向AC/DC变换器并联系统的低电压偏移功率均分控制策略，通过反馈直流线路的平均电流作为全局变量，并引入积分环节，实现了各变换器的功率精确分配而不受线路参数的影响。通过引入平均输出电压比例积分控制，减小了直流母线电压的偏移。探讨了二次纹波电流对并联系统功率控制的影响，引入带阻滤波器，抑制二次纹波电流和电压对并网电流畸变率的影响。分析了变换器并联系统的稳定性，给出了合适的控制参数。最后，仿真验证了所提出的控制策略的有效性。 |
| 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 |
| DOI：10.7667/PSPC161379 |
| 投稿时间：2016-08-24修订日期：2016-12-15 |
| 基金项目:国家自然科学基金项目(51677059) |
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| Simulation study for control strategy of bi-directional AC/DC converter parallel system in DC microgrid |
| LI Peiqiang,DONG Yanting,DUAN Kehui,WU Wenhua |
| (College of Electrical and Information Engineering, Hunan University, Changsha 410082, China) |
| 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. This work is supported by National Natural Science Foundation of China (No. 51677059). |
| Key words: DC microgrids bi-directional AC/DC converter parallel system power sharing low bus voltage deviation secondary ripple |
