Control Strategy of Grid-connected Converter in DC Microgrid Based on Differential Feedforward of Bus Voltage

被引：0
作者：
Zhang H. [1 ]
Yan H. [1 ]
Zhi N. [1 ]
Zhang W. [1 ]
Du M. [1 ]
机构：
[1] School of Automation and Information Engineering, Xi'an University of Technology, Xi'an
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2019年 / 43卷 / 15期
基金：
中国国家自然科学基金;
关键词：
DC microgrid; Grid-connected converter; Virtual capacitor; Voltage fluctuation suppression;
D O I：
10.7500/AEPS20181008003
中图分类号：
学科分类号：
摘要：
To solve the problem of low inertia and poor disturbance rejection of DC microgrid, this paper proposes a current control strategy of grid-connected inverter in the DC microgrid based on differential feedforward of bus voltage. Aiming at the three-phase half-bridge grid-connected converter, the linear control relationship between DC bus voltage and inductance current is established according to the inequality constraints in DC microgrid. The control instruction value of inductance current is generated by combining the variation rate of DC bus voltage with the steady-state current value of filter inductance. In order to reduce the bus voltage drop under the disturbance, the virtual capacitor is designed by using the relationship between energy and power, and it is introduced into the bus voltage control loop to improve the anti-disturbance ability of DC microgrid without increasing the actual capacitance. The stability analysis of DC microgrid after adding virtual capacitance is given. The feasibility of the proposed control strategy is verified by simulation and experiment. © 2019 Automation of Electric Power Systems Press.
引用
收藏
页码：166 / 171
页数：5
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