An Improved Single Phase-locked Loop Based on Synchronous Reference Frame
Accurate tracking of phase angle, frequency and amplitude of the utility voltage is essential to ensure correct operation of grid connected inverters. The commonly used single phase-locked loop(SPLL) has poor dynamic characteristics due to the problem of delay caused by low-pass filter or the constr...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Control and Information Technology
2019-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2096-5427.2019.02.005 |
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| Summary: | Accurate tracking of phase angle, frequency and amplitude of the utility voltage is essential to ensure correct operation of grid connected inverters. The commonly used single phase-locked loop(SPLL) has poor dynamic characteristics due to the problem of delay caused by low-pass filter or the construction of virtual quadrature signal. Therefore, it is slower in obtaining the information of phase, frequency and amplitude of grid voltage. To solve this problem, it presented an improved single phase-locked loop. Short delay of its input voltage signal is obtained and trigonometric function is used to obtain the quadrature signal with 90° phase shift. According to the principle of three-phase digital phase-locked loop(DPLL) based on the transformation from αβ stationary reference to dq synchronously rotating reference, the single-phase digital phase-locked(SPLL) control based on a fictitious two-phase rectangular coordinate system is realized. The improved algorithm of SPLL is simple, fast and easy to implement. The results of simulation analysis based on Matlab and experiments show that the improved SPLL can accurately track voltage frequency, phase and amplitude changes of power grid, and can quickly achieve stability |
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| ISSN: | 2096-5427 |