A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid
Repetitive control (RC) is gradually used in inverters tied with weak grid. To achieve the zero steady-state error tracking of inverter current and compensate the harmonic distortion caused by frequency fluctuation, a frequency adaptive (FA) control scheme for LCL-type inverter connected with weak g...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/14/4225 |
| _version_ | 1797527239216070656 |
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| author | Chengbi Zeng Sudan Li Hanwen Wang Hong Miao |
| author_facet | Chengbi Zeng Sudan Li Hanwen Wang Hong Miao |
| author_sort | Chengbi Zeng |
| collection | DOAJ |
| description | Repetitive control (RC) is gradually used in inverters tied with weak grid. To achieve the zero steady-state error tracking of inverter current and compensate the harmonic distortion caused by frequency fluctuation, a frequency adaptive (FA) control scheme for LCL-type inverter connected with weak grid is proposed. This scheme adopts a proportional resonance (PR) controller in parallel with RC (PRRC) to overcome the disadvantages caused by RC inherent one-cycle time delay. A fractional delay (FD) filter based on the Newton structure is proposed to approximate the fraction item of <i>f<sub>s</sub></i>/<i>f</i>, where <i>f<sub>s</sub></i> and <i>f</i> are sample frequency and grid frequency, respectively. The structure of the proposed FD filter is relatively simple; moreover, coefficients of the filter maintain constant so as not to need online tuning even when grid frequency fluctuates, which decreases the computational burden considerably. The feasibility and effectiveness of the proposed FA control scheme, named as Newton-FAPRRC, are all verified by the simulation and experimental results. |
| first_indexed | 2024-03-10T09:40:14Z |
| format | Article |
| id | doaj.art-7bef547cb44f4146961bc50f05dca18c |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T09:40:14Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7bef547cb44f4146961bc50f05dca18c2023-11-22T03:42:09ZengMDPI AGEnergies1996-10732021-07-011414422510.3390/en14144225A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak GridChengbi Zeng0Sudan Li1Hanwen Wang2Hong Miao3College of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaCollege of Electrical Engineering, Sichuan University, Chengdu 610065, ChinaRepetitive control (RC) is gradually used in inverters tied with weak grid. To achieve the zero steady-state error tracking of inverter current and compensate the harmonic distortion caused by frequency fluctuation, a frequency adaptive (FA) control scheme for LCL-type inverter connected with weak grid is proposed. This scheme adopts a proportional resonance (PR) controller in parallel with RC (PRRC) to overcome the disadvantages caused by RC inherent one-cycle time delay. A fractional delay (FD) filter based on the Newton structure is proposed to approximate the fraction item of <i>f<sub>s</sub></i>/<i>f</i>, where <i>f<sub>s</sub></i> and <i>f</i> are sample frequency and grid frequency, respectively. The structure of the proposed FD filter is relatively simple; moreover, coefficients of the filter maintain constant so as not to need online tuning even when grid frequency fluctuates, which decreases the computational burden considerably. The feasibility and effectiveness of the proposed FA control scheme, named as Newton-FAPRRC, are all verified by the simulation and experimental results.https://www.mdpi.com/1996-1073/14/14/4225repetitive control (RC)weak gridfrequency adaptive (FA)Newton structurefractional delay (FD) filter |
| spellingShingle | Chengbi Zeng Sudan Li Hanwen Wang Hong Miao A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid Energies repetitive control (RC) weak grid frequency adaptive (FA) Newton structure fractional delay (FD) filter |
| title | A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid |
| title_full | A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid |
| title_fullStr | A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid |
| title_full_unstemmed | A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid |
| title_short | A Frequency Adaptive Scheme Based on Newton Structure of PRRC for LCL-Type Inverter Connected with Weak Grid |
| title_sort | frequency adaptive scheme based on newton structure of prrc for lcl type inverter connected with weak grid |
| topic | repetitive control (RC) weak grid frequency adaptive (FA) Newton structure fractional delay (FD) filter |
| url | https://www.mdpi.com/1996-1073/14/14/4225 |
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