| 摘要: |
| 为实现快速准确的电网同步，基于类Ⅰ型结构对现有三相增强型锁相环进行改进，设计了一种结合类Ⅰ型结构与三相增强型结构的新型锁相环(QT1-3P-EPLL)。在频率环中采用级联延时信号消除滤波器与Ⅰ型结构相结合的类Ⅰ型结构，与现有基于级联延时信号消除滤波器的三相增强型锁相环相比，可以有效地提高系统的动态响应速度和稳定性，同时消除电网电压干扰的影响。仿真结果表明QT1-3P-EPLL能够在电网电压受干扰时快速、准确地跟踪电网电压的频率和幅值。最后对所提出的锁相环进行了实验测试，结果证明了该锁相环的有效性。 |
| 关键词: 非理想电网 级联延时信号消除滤波器 类Ⅰ型结构 三相增强型锁相环 同步 |
| DOI：10.16081/j.epae.202004012 |
| 分类号:TN911.8 |
| 基金项目:湖南省自然科学基金资助项目(2018JJ2397) |
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| Three-phase enhanced PLL based on QT1 structure |
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MA Qian, WANG Yuting
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College of Automation and Electronic Information, Xiangtan University, Xiangtan 411100, China
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| Abstract: |
| In order to achieve fast and accurate grid synchronization, a new QT1-3P-EPLL(Quasi Type 1 structure based Three-Phase Enhanced Phase Locked Loop) is proposed. The QT1 structure composed of the CDSC(Cascaded Delay Signal Cancelation) filter and the Type 1 structure is used in the frequency loop, which can effectively improve the dynamic response speed and stability of the system compared with the existing CDSC-3P-EPLL, and eliminate the influence of grid voltage interference. The simulative results show that the QT1-3P-EPLL can track the frequency and amplitude of the grid voltage quickly and accurately when the grid voltage is disturbed. Finally, the experimental test is carried out, and the results prove the effectiveness of the proposed QT1-3P-EPLL. |
| Key words: non-ideal grid cascade delay signal cancelation filter QT1 structure three-phase enhanced phase locked loop synchronization |
