摘要
为了降低对主网的冲击,级联型电力电子变压器的逆变级输出波形应稳定,没有畸变。然而,当其带不平衡负载时,输出侧电压会出现严重的不平衡及二倍频波动分量。采用PI与PR相结合的虚拟同步机控制策略,消除二倍频分量且使逆变级能够输出平衡的三相电压。建立MATLAB/Simulink仿真模型,与传统VSG进行对比,仿真结果证明了所采用方案的可行性。
In order to reduce the impact on the main grid,the output waveform of the inverter stage of the cascaded power electronic transformer should be stable without distortion.However,when it has an unbalanced load,the output side voltage will have a serious unbalance and contain the second harmonic component.In this paper,the virtual synchronous machine control strategy combining PI and PR is adopted to eliminate the second harmonic component and enable the inverter stage to output balanced three-phase voltage.The MATLAB/Simulink simulation model is established.Compared with the traditional VSG,the simulation results prove the feasibility of the adopted scheme.
作者
王新磊
钟建伟
田浩
WANG Xinlei;ZHONG Jianwei;TIAN Hao(College of Intelligent Systems Science and Engineering,Hubei Minzu University,Enshi 445000,China)
出处
《电工技术》
2023年第6期42-43,46,共3页
Electric Engineering
基金
国家自然科学基金(编号61963014)
国网湖北省电力有限公司2022科技项目(编号5215P0220001)。
关键词
电力电子变压器
逆变级
虚拟同步机
不平衡负载
power electronic transformer
inverter stage
virtual synchronous machine
unbalanced load
