| 引用本文: | 刘一琦,王建赜,傅 裕,李宁宁,纪延超.直流微电网中不同网络结构的负荷功率分配精度研究[J].电力自动化设备,2016,36(3): |
| LIU Yiqi,WANG Jianze,FU Yu,LI Ningning,JI Yanchao.Load power sharing accuracy for different network configurations of DC microgrid[J].Electric Power Automation Equipment,2016,36(3): |
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| 摘要: |
| 微电网运行过程中，负荷功率的合理分配取决于不同接口变换器的并网容量。为了确保多台变换器均工作在较为理想的工况下，针对直流微电网系统的放射状结构和网状结构，提出了一种基于下垂控制的改进功率分配方法。该方法以下垂控制为基础，针对控制目标变换器引入了相邻的2台接口变换器的直流母线电压平均值补偿分量和输出功率补偿分量，利用低带宽通信网络，实现直流母线电压的提升以及在线路电阻取值不同的情况下不同变换器之间负荷功率的合理分配。对上述控制方法在不同网络结构、线路电阻取值等情况下的适用性进行了详细的分析。同时，利用MATLAB ／ Simulink搭建了带有4台变换器的直流微电网仿真模型，验证了所提出控制方法的有效性。 |
| 关键词: 直流微电网 功率分配 通信延迟 放射状结构 网状结构 下垂控制 |
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| Load power sharing accuracy for different network configurations of DC microgrid |
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LIU Yiqi, WANG Jianze, FU Yu, LI Ningning, JI Yanchao
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School of Electrical Engineering and Automation，Harbin Institute of Technology，Harbin 150001，China
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| Abstract: |
| During the operation of microgrid，the rational load power sharing among different interfacing converters is determined by their grid-connecting capacities. In order to guarantee every converter operating in ideal conditions，a modified power sharing method based on the droop control is proposed for the radial and mesh configurations of DC microgrid，which，based on low-bandwidth communication network，employs two compensating terms for the controlled converter，i.e. the average DC-bus voltage and output power of its two adjacent converters，to realize the enhance of DC-bus voltage and the rational load power sharing among the converters with different line resistances. The applicability of the proposed method for different network configurations and line resistances is analyzed in detail. A MATLAB ／ Simulink model of DC microgrid with four converters is built to verify the effectiveness of the proposed control approach. |
| Key words: DC microgrid power sharing communication delay radial structure mesh structure droop control |
