摘要
孤岛微电网中高比例非线性负荷的接入带来大量的谐波电流,所引起的电能质量问题日益凸显。分布式发电单元的容量差异和线路阻抗差异,导致谐波电流不能均分。这里提出一种二维度自适应虚拟阻抗重构方法,逆变器根据其谐波视在功率,从电感分量和电阻分量两个维度将逆变器等效谐波阻抗自适应重构为阻感性,以匹配线路阻抗的阻感性分量,且能自适应实现谐波电流均分,并兼顾公共连接点电压质量,所提方法无需检测线路阻抗信息,能够自适应实现谐波电流均分。最后通过实验证明了所提控制策略的正确性和有效性。
The access of a high proportion of nonlinear loads in the island microgrid brings a large amount of harmonic currents,and the power quality problems caused by it are becoming increasingly prominent.The difference in the capacity of the distributed power generation unit and the difference in the line impedance cause the harmonic current to not be evenly divided.Therefore,a two-dimensional adaptive virtual impedance reconstruction method is proposed.According to the apparent power of harmonic,the inverter adaptively reconstructs its equivalent harmonic impedance into resistor-inductance from the two dimensions of inductive and resistive components,to match the resistive and inductive component of line impedance,which can adaptively realize the equalization of harmonic current,and improve the voltage quality of the common connection point.The proposed method does not need to detect the line impedance information.It can adaptively realize the equalization of harmonic current.Finally,experimental results verify the correctness and effectiveness of the proposed strategy.
作者
余斌
吴烨
李华喜
黄孔
YU Bin;WU Ye;LI Hua-xi;HUANG Kong(Wuling Power Corporation Ltd.,Changsha 410000,China;不详)
出处
《电力电子技术》
2024年第6期127-130,共4页
Power Electronics
基金
国家电投集团总部科研项目(KYTC2021SD01)。
关键词
孤岛微电网
虚拟阻抗
谐波电流均分
island microgrid
virtual impedance
harmonic current equalization
