虚拟复阻抗下垂控制的多逆变器并联小信号建模 张继红.pdf

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中国测试
究元件参数对于系统稳定性的影响，为并联逆变器参数选型提供理论依据。最后通过 MATLAB／Simulink 建立
数学模型、设置相应参数、验证所提控制策略的合理性与可行性。
关键词：分布式发电；逆变器；下垂控制；小信号分析；虚拟复阻抗
中图分类号：TM9
Multi-inverter parallel small-signal modeling based on virtual complex impedance droop control
ZHANG Jihong1，2, WANG Juan2,ZHANG Zilei1，2 ,YANG Peihong1，2 ,WU Zhenkui1，2,JI Weicheng2
( Mongolia Key Laboratory of Solar and Wind Power, Inner Mongolia University of Science and
Technology, Baotou 014010, China; of Information Engineering ,Inner Mongolia University of
Science and Technology, Baotou 014010, China)
Abstract: The parallel connection of multiple inverters is an important means to solve the expansion, backup
and protection of distributed power generation such as photovoltaics. Aiming at the disadvantages of traditional
droop control methods such as weak anti-disturbance ability, serious circulation phenomenon and easy
oscillation, the article proposes an improved droop control strategy based on virtual complex impedance, and
establishes a parallel connection mode of traditional droop control and improved droop control inverters in
parallel. The small-signal mathematical model analyzes the influence of the distribution of system characteristic
roots on the active droop coefficient and reactive power droop coefficient. By introducing virtual complex
impedance, the characteristic root damping of the low-frequency domain environment is enhanced, and the
oscillation problem of parallel operation of inverters is solved, Studied the influence of component parameters
on system stability, and provided a theoretical b