期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 11, 页码 13248-13260出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3080131
关键词
Current control; Resonant frequency; Transfer functions; Voltage control; Frequency control; Delays; Power electronics; Current control; proportional-resonant (PR) controller; pulse width modulation power converters
资金
- National Natural Science Foundation of China [51807152]
- State Key Laboratory of Electrical Insulation and Power Equipment
The article discusses two typical linear current control schemes for three-phase voltage source converters: the PI controller in the dq-frame and the PR controller in the alpha beta-frame. It is found that using cross-coupling terms in the alpha beta-frame can improve current tracking transient response and reduce sensitivity to frequency variation, showing differences in control performance compared to the fully decoupled PI control scheme in the dq-frame.
The proportional-integrator (PI) controller in the synchronous reference frame (dq-frame) and the proportional-resonant (PR) controller in the stationary reference frame (alpha beta-frame) are two typical linear current control schemes for three-phase voltage source converters. It is generally believed that the plant model is mathematically uncoupled in alpha beta-frame. Hence, the decoupling control required to attenuate the axis cross-coupling effect in dq-frame is regarded as not necessary in alpha beta-frame. However, detailed analysis with complex coefficient transfer functions reveals differences in the control performance between the fully decoupled PI control scheme in dq-frame and the PR control scheme in alpha beta-frame. When regulating sinusoidal currents in alpha beta-frame, the alpha-axis and beta-axis current references are strongly correlated with each other, which implies a cross-coupling effect equivalent to that of dq-frame. In analogy to the dq-frame decoupling control, cross-coupling terms can be employed together with the conventional PR control scheme. It can bring the benefit of improving the transient response of current tracking and reducing the sensitivity of the resonant controller to frequency variation, especially for low-switching-frequency applications with limited current control bandwidth. Furthermore, the cross-coupling terms based on reference current feed-forward are proposed to improve the performance of both positive- and negative-sequence current control. Experimental results are shown to validate the analysis and the performance of the proposed control scheme.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据