| 基于母线电压微分前馈的直流微电网并网变换器控制策略 |
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| 引用本文： | 张辉,闫海明,支娜,张伟亮,杜明桥. 基于母线电压微分前馈的直流微电网并网变换器控制策略[J]. 电力系统自动化, 2019, 43(15): 166-171 |
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| 作者姓名： | 张辉 闫海明 支娜 张伟亮 杜明桥 |
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| 作者单位： | 西安理工大学自动化与信息工程学院, 陕西省西安市 710048,西安理工大学自动化与信息工程学院, 陕西省西安市 710048,西安理工大学自动化与信息工程学院, 陕西省西安市 710048,西安理工大学自动化与信息工程学院, 陕西省西安市 710048,西安理工大学自动化与信息工程学院, 陕西省西安市 710048 |
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| 基金项目： | 国家自然科学基金资助项目(51877175)；陕西省重点研发计划资助项目(2017ZDXM-GY-003)；陕西省自然科学基金资助项目(2017JM5100) |
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| 摘 要： | 为解决直流微电网惯性低、抗扰动能力差的问题，提出基于母线电压微分前馈的直流微电网并网变换器电流控制策略。以三相半桥并网变换器为研究对象，根据不等式约束条件建立直流母线电压与电感电流线性控制关系，将母线电压变化率与原接网电感的稳态电流值相结合，作为电感电流的控制指令值。为降低扰动下母线电压跌落，利用能量与功率关系设计虚拟电容并将其引入母线电压控制环，实现在不增加实际电容的情况下提高直流微电网的抗扰动能力。同时，给出了加入虚拟电容后直流微电网的稳定性分析。仿真和实验验证了所提控制策略的可行性。
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| 关 键 词： | 虚拟电容；电压波动抑制；并网变换器；直流微电网 |
| 收稿时间： | 2018-10-08 |
| 修稿时间： | 2019-07-01 |
Control Strategy of Grid-connected Converter in DC Microgrid Based on Differential Feedforward of Bus Voltage |
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| ZHANG Hui,YAN Haiming,ZHI N,ZHANG Weiliang and DU Mingqiao. Control Strategy of Grid-connected Converter in DC Microgrid Based on Differential Feedforward of Bus Voltage[J]. Automation of Electric Power Systems, 2019, 43(15): 166-171 |
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| Authors: | ZHANG Hui YAN Haiming ZHI N ZHANG Weiliang DU Mingqiao |
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| Affiliation: | School of Automation and Information Engineering, Xi''an University of Technology, Xi''an 710048, China,School of Automation and Information Engineering, Xi''an University of Technology, Xi''an 710048, China,School of Automation and Information Engineering, Xi''an University of Technology, Xi''an 710048, China,School of Automation and Information Engineering, Xi''an University of Technology, Xi''an 710048, China and School of Automation and Information Engineering, Xi''an University of Technology, Xi''an 710048, China |
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| Abstract: | 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. |
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| Keywords: | virtual capacitor voltage fluctuation suppression grid-connected converter DC microgrid |
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