| 引用本文: | 刘宁宁,曹炜,赵晋斌.直流微电网的一种增量式下垂控制方法[J].电力系统保护与控制,2018,46(8):24-30. |
| LIU Ningning,CAO Wei,ZHAO Jinbin.An incremental droop control method for DC micro-grid[J].Power System Protection and Control,2018,46(8):24-30 |
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| 摘要: |
| 在直流微电网中，下垂控制是解决负荷功率分配问题的基本控制方法之一。传统的下垂控制方法是基于负荷电流I的U-I下垂控制，这种方法虽然可靠性和经济性较好，但是在实际直流微电网运行中由于各微电源之间线路阻抗不一致或者本地负荷不平衡，各分布式电源发出的有功功率会出现分配不均进而产生系统环流。为此，提出一种电压增量式 下垂控制方法。该方法引入了电压变化率 ，并且利用平均负荷 来校正每台变化器的输出功率，从而达到输出有功功率一致、减小系统环流的目的。对该控制方法分别在连线阻抗不一致和本地负荷不平衡的工况下进行了仿真验证，其结果验证了该控制方法的有效性。 |
| 关键词: 增量式控制 电压变化率 线路阻抗 本地负荷 功率分配 |
| DOI：10.7667/PSPC170490 |
| 分类号: |
| 基金项目:上海市自然科学基金项目资助(16ZR1413000) |
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| An incremental droop control method for DC micro-grid |
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LIU Ningning,CAO Wei,ZHAO Jinbin
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(College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
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| Abstract: |
| In the DC micro-grid, the droop control is a basic control method to solve the problem of load sharing. The conventional droop control method is the U-I droop control based on the load current I. Although the reliability and economy of this method are better, due to the inconsistent line impedances or unbalanced local load between micro sources during real DC micro-grid operation, the load will not be shared accurately between DGs and then produce system circulation. A voltage incremental droop control method is proposed, which introduces the voltage change rate and corrects the output power of each DG by using the average power , to achieve reasonable load share and reduce the circulating current. The control method is simulated in the line impedance inconsistency and local load imbalance to verify the feasibility of the control method. This work is supported by Natural Science Foundation of Shanghai (No. 16ZR1413000). |
| Key words: incremental control voltage change rate line impedances local load load sharing |
