中圖分類號： TP29；TM464 文獻標識碼： A DOI：10.16157/j.issn.0258-7998.222919 中文引用格式： 陳曉彤，孫正，羅利文. 一種可適應復雜網(wǎng)壓條件的快速鎖相環(huán)[J].電子技術應用，2022，48(12)：74-78. 英文引用格式： Chen Xiaotong，Sun Zheng，Luo Liwen. A fast PLL which can adapt to complex grid voltage conditions[J]. Application of Electronic Technique，2022，48(12)：74-78.
A fast PLL which can adapt to complex grid voltage conditions
Chen Xiaotong1，Sun Zheng2，Luo Liwen1
1.School of Electronic Information and Electrical Engineering，Shanghai Jiaotong University，Shanghai 200240，China； 2.SAIC Motor Corporation Limited，Shanghai 200041，China
Abstract： Phase-locked loop(PLL) based on dual second-order generalized integrator(DSOGI-PLL) is widely used in inverter synchronous grid-connection. However, when the power grid voltage is unbalanced or harmonic components and DC offset exists, namely, when the grid voltage condition is complex, DSOGI-PLL has a large deviation from the frequency. Therefore, an improved structure is proposed. The DC component suppression module is added to filter the DC voltage, and the low-pass filter is added to improve the ability of the PLL to suppress harmonic voltage, and accurately extract the grid voltage synchronization signal. The simulation results in MATLAB/Simulink verify that the PLL can filter out the harmonic component and DC component, and the effect is better.
Key words : second-order generalized integrator；phase locked loop；harmonic；DC offset；unbalanced voltage
