An Improved Phase-locked Loop Based on Second-order Generalized Integrator
Under ideal grid voltage conditions, single synchronous reference frame phase-locked loop (SSRF-PLL) enables fast and accurate phase/frequency detection, however, abnormal grid voltage conditions highly degrade its performance. To overcome this drawback, it presented an improved PLL based on second-...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Control and Information Technology
2017-01-01
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| Series: | Kongzhi Yu Xinxi Jishu |
| Subjects: | |
| Online Access: | http://ctet.csrzic.com/thesisDetails#10.13889/j.issn.2095-3631.2017.02.200 |
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| Summary: | Under ideal grid voltage conditions, single synchronous reference frame phase-locked loop (SSRF-PLL) enables fast and accurate phase/frequency detection, however, abnormal grid voltage conditions highly degrade its performance. To overcome this drawback, it presented an improved PLL based on second-order generalized integrator (SOGI). The extraction of DC component is performed by the definite integral operation, and then the phase error caused by the DC offset can be eliminated. By the accurate estimation of frequency and parameter tuning, the resonance frequency of SOGI is adaptive to the grid frequency variation. The stability margin, dynamics response, and disturbance rejection ability are the critical factors that are considered in parameters optimization. Simulation and experimental results show that the PLL has excellent performance under non-ideal grid voltage conditions including voltage asymmetry, harmonics, frequency varying and DC offset. |
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| ISSN: | 2096-5427 |