| 计及光储荷特性的直流微网低压穿越控制策略 |
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| 引用本文： | 李妍,王展,黄迅,张慧媛,何大瑞.计及光储荷特性的直流微网低压穿越控制策略[J].中国电力,2019,52(7):47-54. |
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| 作者姓名： | 李妍 王展 黄迅 张慧媛 何大瑞 |
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| 作者单位： | 1. 国网江苏省电力有限公司经济技术研究院, 江苏 南京 210008;2. 国网江苏电力设计咨询有限公司, 江苏 南京 210008;3. 国网江苏省电力有限公司, 江苏 南京 210008;4. 华北电力大学 电气与电子工程学院, 北京 102206 |
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| 基金项目： | 国网江苏电力设计咨询有限公司科技项目（JE201803）。 |
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| 摘 要： | 针对并网运行的直流微网低电压穿越问题，分析了光储荷直流微网系统构成及运行原理，得出了直流母线电压解析表达式。基于不同电压跌落幅度及变流器最大承载电流限制，提出了一种计及光储荷特性的母线电压分层协调控制策略，依据母线电压波动幅度和微网功率状态，综合调整各单元运行模式来实现系统低电压穿越，提升了系统低电压穿越期间功率平衡及直流母线电压稳定水平。最后通过MATLAB/Simulink平台搭建仿真实例，验证了所提低电压穿越控制策略的可行性和对直流母线电压更好的控制效果。
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| 关 键 词： | 直流微网 直流母线电压 电压分层 低电压穿越 功率状态 |
| 收稿时间： | 2019-05-22 |
| 修稿时间： | 2019-06-06 |
LVRT Control Strategy For DC Microgrids Considering the Characteristics of PV/Storage/Load |
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| LI Yan,WANG Zhan,HUANG Xun,ZHANG Huiyuan,HE Darui.LVRT Control Strategy For DC Microgrids Considering the Characteristics of PV/Storage/Load[J].Electric Power,2019,52(7):47-54. |
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| Authors: | LI Yan WANG Zhan HUANG Xun ZHANG Huiyuan HE Darui |
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| Affiliation: | 1. State Grid Jiangsu Economic Research Institute, Nanjing 210008, China;2. State Grid Jiangsu Electric Power Design Consulting Co., Ltd., Nanjing 210008, China;3. State Grid Jiangsu Electric Power Co., Ltd., Nanjing 210008, China;4. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China |
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| Abstract: | Low voltage ride-through (LVRT) of grid-connected DC microgrid has been driving academic attentions. Firstly, the structure and operation principle of DC microgrids are developed to obtain the analytical expression of DC bus voltage. Secondly, based on different voltage sags and the maximum current limitation of the converter, a hierarchical coordinated control strategy of bus voltage is proposed considering the characteristics of PV/storage/load. Then according to the fluctuation range of bus voltage and the power state of microgrid, operation modes of DC grid unit are adjusted comprehensively to realize LVRT, which can improve the power balance as well as the stability level of DC bus voltage during LVRT. Finally, a simulation example is built on the platform of MATLAB/Simulink to verify the feasibility of the LVRT strategy and the effectiveness of the control strategy on DC bus voltage. |
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| Keywords: | DC microgrid bus voltage voltage stratification LVRT power state |
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