交直流混合微电网中直流母线电压纹波抑制方法

发布时间：2018-02-26 01:32

本文关键词： 交直流混合微电网直流有源电力滤波器纹波电压抑制即插即用　出处：《电网技术》2017年09期 　论文类型：期刊论文

【摘要】：在交直流混合微电网中,若汇入直流母线中的功率瞬时值中含有纹波分量(如三相不平衡交流负荷、交直流微电网互联功率存在不平衡有功功率分量等),均会导致直流母线电压出现纹波分量,严重时会影响系统供电电能质量和可靠性。为此,提出基于直流有源滤波器(DC active power filter,DC-APF)的直流母线电压纹波抑制方法,主要由直流电压纹波抑制、直流有源滤波器输入端电容电压控制以及电流闭环控制3部分构成。阻抗分析方法表明所采用的控制参数设计方法能保证拟抑制纹波频率处直流有源电力滤波器输出阻抗远小于直流微电网中其余单元的输出阻抗,从而能消除或减小直流纹波电压。此外,基于所提方法,还可实现多直流有源滤波器即插即用与并联运行。最后在Matlab/Simulink中搭建了含直流型分布式电源、交直流双向DC-AC变流器、直流负荷以及两台直流有源电力滤波器的交直流混合微电网仿真模型,建立了相应的实验平台,数字仿真和实验结果均验证了所提方法的有效性。
[Abstract]:In a hybrid AC / DC microgrid, if the instantaneous value of power confluent into the DC bus contains ripple components, such as three-phase unbalanced AC load, The existence of unbalanced active power components in AC / DC microgrid interconnection will lead to ripple components of DC bus voltage, which will seriously affect the power quality and reliability of the power supply system. A DC bus voltage ripple suppression method based on DC active power filter is proposed, which is mainly controlled by DC voltage ripple. The capacitive voltage control and current closed loop control of DC active power filter are made up of three parts. The impedance analysis method shows that the proposed control parameter design method can guarantee the DC active power filter at the frequency of ripple suppression. The output impedance is much smaller than the output impedance of the other elements in the DC microgrid. Therefore, the DC ripple voltage can be eliminated or reduced. In addition, based on the proposed method, multiple DC active power filters can be operated in plug and play and parallel operation. Finally, a DC type distributed power supply, AC / DC bidirectional DC-AC converter is built in Matlab/Simulink. The simulation model of AC / DC hybrid microgrid with DC load and two DC active power filters is established and the corresponding experimental platform is established. The effectiveness of the proposed method is verified by digital simulation and experimental results.
【作者单位】：智能电网教育部重点实验室(天津大学);国网浙江省电力公司;
【基金】：国家高技术研究发展计划(863计划)(2015AA050104) 国家自然科学基金项目(51507109)~~
【分类号】：TM727

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