A method to improve the transient response of dq-frame cascaded delayed-signal-cancellation PLL

A method to improve the transient response of dq-frame cascaded delayed-signal-cancellation PLL
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改善dq帧级联延迟信号消除PLL瞬态响应的方法

DOI:
10.1016/j.epsr.2017.10.004
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发表时间:
2018-02
影响因子:
3.9
通讯作者:
Yong Yang
Yong Yang
中科院分区:
工程技术3区
文献类型:
--
作者:
Menxi Xie;Huiqing Wen;Canyan Zhu;Yong Yang

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基于级联延迟信号消除(CDSC)的PLL indqrotate框架(dqCDSC-PLL)可以完全消除相位误差的干扰。然而,将CDSC纳入PLL结构后,其开环带宽受到显着影响,因此tridqCDSC-PLL的瞬态响应性能恶化。本文提出了一种改进的dqCDSC-PLL,通过将基于数字滤波器的相位超前补偿器级联到基于CDSC的PLL中,以在不牺牲稳定性的情况下提高动态响应。该滤波器在通带内表现出平坦的增益,可以补偿CDSC引起的相位延迟,同时保持陷波点的衰减。改进的 dqCDSC-PLL 显着增加了开环带宽并增强了动态性能。此外,为了进一步最小化不期望的稳态误差,采用了频率自适应控制,而不使用任何额外的电路。为了验证所提方法的有效性,基于Matlab/Simulink对多种工况进行了仿真。此外,还提供了典型场景的实验结果,突出了改进的dqCDSC-PLL在动态性能方面的优势。
The cascaded delayed signal cancellation (CDSC) based PLL indqrotate frame (dqCDSC-PLL) can totally eliminate the disturbances of phase error. However, its open-loop bandwidth is significantly affected after incorporating CDSC into the PLL structure, so the transient response performance of threedqCDSC-PLLs are deteriorated. This paper proposes an improveddqCDSC-PLL by cascading a digital filter based phase-lead compensator into CDSC-based PLL to improve the dynamic response without sacrificing the stability. The filter shows flat gain in the passband, which can compensate the phase delay induced by CDSC and simultaneously maintain the attenuation of the notch point. The improveddqCDSC-PLLs significantly increases the open-loop bandwidth and enhances the dynamic performance. Besides, in order to further minimize the undesirable steady-state error, the frequency adaptive control was adopted without using any additional circuits. In order to verify the effectiveness of the proposed method, the simulation based on Matlab/Simulink is carried out for various conditions. Furthermore, experimental results for typical scenarios are provided, which highlight the advantage of the improveddqCDSC-PLL in terms of the dynamic performance.
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