| 引用本文: | 李松,李建伟,董云飞,石磊,张虎,李永丽.多子微电网型交直流混合配电系统灵活功率控制与电压抑制策略[J].电力自动化设备,2021,41(5): |
| LI Song,LI Jianwei,DONG Yunfei,SHI Lei,ZHANG Hu,LI Yongli.Flexible power control and voltage suppression strategy for hybrid AC/DC distribution system with multi-microgrids[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 为了解决多子微电网型交直流混合配电系统功率分配以及交流子微电网母线电压偏差大的问题，提出一种灵活功率控制与电压抑制策略。首先分别推导了单个交流子微电网频率、直流子微电网电压与公共直流母线电压的关系，然后分析多个交直流子微电网之间的频率与电压关系，并利用此关系对交直流子微电网中储能单元的下垂控制进行改进，实现整个系统的功率互助及分配。另外，对双向AC/DC变换器电流内环控制进行改进，利用扩张状态观测器对扰动电流进行跟踪，并将跟踪得到的扰动电流引入双向AC/DC变换器电流内环中进行补偿消除，以抑制交流子微电网的电压波动。最后，在MATLAB/Simulink仿真平台中建立多子微电网型交直流混合配电系统模型，仿真结果表明所提控制方法可以实现交直流混合配电系统中子微电网间的功率互助，较好地维持交流子微电网母线电压和频率、直流子微电网电压与公共直流母线电压的稳定。 |
| 关键词: 多子微电网 交直流混合配电系统 功率互助 扩张状态观测器 电压抑制 |
| DOI：10.16081/j.epae.202105030 |
| 分类号:TM73 |
| 基金项目:国家电网有限公司总部科技项目(适应灵活可控源荷接入的新型城市电网继电保护关键技术研究及应用) |
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| Flexible power control and voltage suppression strategy for hybrid AC/DC distribution system with multi-microgrids |
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LI Song1, LI Jianwei2, DONG Yunfei2, SHI Lei2, ZHANG Hu2, LI Yongli1
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1.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;2.Electric Power Branch of Shaanxi Binchang Mining Group Corporation Limited, Xianyang 712000, China
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| Abstract: |
| In order to solve the problems of power distribution and large bus voltage deviation of AC sub-microgrid in hybrid AC/DC distribution system with multi-microgrids, a flexible power control and voltage suppression strategy is proposed. Firstly, the relationship between frequency of single AC sub-microgrid and voltage of common DC bus, the relationship between voltage of single DC sub-microgrid and voltage of common DC bus are derived separately, and then the relationship among the frequency and voltage of multiple AC/DC sub-microgrids is analyzed. By using this relationship, the droop control of the energy storage unit in AC/DC sub-microgrids is improved to realize the power mutual assistance and distribution of the whole system. In addition, the inner-loop current control of bidirectional AC/DC converter is improved. The extended state observer is used to track the disturbance current, and the observed disturbance current is introduced into the inner-loop current to compensate and eliminate the voltage fluctuation of AC sub-microgrid. Finally, a hybrid AC/DC distribution system model with multi-microgrids is established in MATLAB/Simulink simulation platform. The simulative results show that the proposed control method can achieve power mutual assistance among the sub-microgrids in hybrid AC/DC distribution system, and maintain the stability of bus voltage and frequency of AC sub-microgrid, voltage of DC sub-microgrid and voltage of common DC bus. |
| Key words: multi-microgrids hybrid AC/DC distribution system power mutual assistance extended state observer voltage suppression |
