Impedance Analysis of SOGI-FLL-Based Grid Synchronization

Impedance Analysis of SOGI-FLL-Based Grid Synchronization
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基于SOGI-FLL的电网同步的阻抗分析

DOI:
10.1109/tpel.2017.2673866
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发表时间:
2017-02
影响因子:
6.7
通讯作者:
Fang Zhuo
Fang Zhuo
中科院分区:
工程技术1区
文献类型:
--
作者:
Hao Yi;Xiongfei Wang;Frede Blaabjerg;Fang Zhuo

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最新的研究指出锁相环(PLL)在并网变流器的阻抗整形中起着重要的作用,但迄今为止的研究大多集中在同步参考系锁相环上。另外,这封信提出了二阶广义积分器锁频环(SOGI-FLL),它已被引入实现电网同步在静止参考系的阻抗分析。针对采用SOGI-FLL的并网变换器,研究了电压扰动对相位估计值以及输出电流的影响。SOGI-FLL的频率耦合效应也被识别和验证的实验测试。
The latest research has pointed out that the phase-locked loop (PLL) plays an important role in shaping the impedance of grid-connected converters, yet most of the works so far merely focus on the synchronous reference-frame PLL. Alternatively, this letter presents the impedance analysis of the second-order generalized integrator frequency-locked loop (SOGI-FLL), which has been introduced for realizing grid synchronization in the stationary reference frame. The influences of the voltage perturbation on the estimated phase and further on the output current are revealed for the grid-connected converter using the SOGI-FLL. The frequency-coupling effect of the SOGI-FLL is also identified and verified in the experimental tests.
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