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基于虚拟同步发电机的直流微网DC-DC变换器控制策略
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1. 新能源电力系统国家重点实验室(华北电力大学), 河北省保定市 071003; 2. 国网温州供电公司, 浙江省温州市 325000

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已申请国家发明专利(201710411243.8)


Control Strategy of DC-DC Converter in DC Microgrid Based on Virtual Synchronous Generator
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Affiliation:

1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (North China Electric Power University), Baoding 071003, China; 2. State Grid Wenzhou Power Supply Company, Wenzhou 325000, China

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    摘要:

    针对直流微网惯性低,母线电压易受功率波动影响的问题,文中提出了一种直流微网类虚拟同步发电机控制策略并将其应用到双向DC-DC变换器中,提高了直流微网的惯性,抑制了直流母线的电压波动。首先,通过类比交流微网中的虚拟同步发电机控制,得到了适用于直流微网中的类虚拟同步发电机控制。其次,通过建立小信号模型,对所提控制策略进行了理论分析,并针对电压动态变化过程中初始阶段的大扰动,采用前馈补偿进行了修正。然后,分析了加入虚拟惯性后控制参数对稳定性的影响。最后,通过MATLAB/Simulink仿真分析验证了所提理论分析和控制策略的有效性。

    Abstract:

    Aiming at the problems of low inertia of DC microgrids and power fluctuation which easily effects the bus voltage, a control strategy of analogous virtual synchronous generator is proposed and applied in bi-directional DC-DC converter to strengthen the inertia of DC microgrid and suppress voltage fluctuation of DC bus. Firstly, the virtual synchronous generator control in AC microgrid is analogized to obtain the control strategy of analogous virtual synchronous which is suitable in DC microgrid. Then, the small-signal model is built to theoretically analyze the proposed strategy. The large disturbance in the beginning changes of voltage is corrected by the feedforward compensation. Furthermore, the influence of control parameters on stability after using virtual inertia is analyzed. Finally, the effectiveness of the above theoretical analysis and control strategy is verified by MATLAB/Simulink Simulations.

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朱晓荣,孟凡奇,谢志云.基于虚拟同步发电机的直流微网DC-DC变换器控制策略[J].电力系统自动化,2019,43(21):132-140. DOI:10.7500/AEPS20180730015.
ZHU Xiaorong, MENG Fanqi,XIE Zhiyun.Control Strategy of DC-DC Converter in DC Microgrid Based on Virtual Synchronous Generator[J].Automation of Electric Power Systems,2019,43(21):132-140. DOI:10.7500/AEPS20180730015.

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  • 收稿日期:2018-07-30
  • 最后修改日期:2019-06-13
  • 录用日期:2019-05-09
  • 在线发布日期: 2019-06-11
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