A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters
The power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects on the equipment and devices co...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/3/597 |
| _version_ | 1797407490404515840 |
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| author | Reyyan Ahmad Khan Muhammad Noman Ashraf Woojin Choi |
| author_facet | Reyyan Ahmad Khan Muhammad Noman Ashraf Woojin Choi |
| author_sort | Reyyan Ahmad Khan |
| collection | DOAJ |
| description | The power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects on the equipment and devices connected to a power system network such as heating and derating. These effects lead to problems in terms of safety and lifespan. Therefore, harmonic standards such as IEEE 519 and P1547 suggest that GCIs should achieve total harmonic distortion (THD) of the output current that is less than 5%. However, it is not easy to achieve the current THD of GCIs that is less than 5% with only an output filter under distorted grid conditions. In this paper, a harmonic compensation method using a lock-in amplifier (LIA) is proposed. Due to the outstanding performance of the LIA, accurate information of the harmonics can be obtained. This information is used to eliminate the harmonics by the simple PI controller. To demonstrate the superiority of the proposed method, it is applied to a 5 kW single phase GCI connected to the real grid. The results obtained are compared with those of the conventional harmonic compensation methods. |
| first_indexed | 2024-03-09T03:42:15Z |
| format | Article |
| id | doaj.art-3339436087bf433cb8a08772e7871495 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T03:42:15Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-3339436087bf433cb8a08772e78714952023-12-03T14:38:25ZengMDPI AGEnergies1996-10732021-01-0114359710.3390/en14030597A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected InvertersReyyan Ahmad Khan0Muhammad Noman Ashraf1Woojin Choi2Department of Electrical Engineering, Soongsil University, Seoul 06978, KoreaDepartment of Electrical Engineering, Soongsil University, Seoul 06978, KoreaDepartment of Electrical Engineering, Soongsil University, Seoul 06978, KoreaThe power quality of grid-connected inverters (GCIs) is attracting a lot of attention as the number of distributed generation systems with renewable energy sources are increased. It is well known that the harmonics present in the grid have a lot of detrimental effects on the equipment and devices connected to a power system network such as heating and derating. These effects lead to problems in terms of safety and lifespan. Therefore, harmonic standards such as IEEE 519 and P1547 suggest that GCIs should achieve total harmonic distortion (THD) of the output current that is less than 5%. However, it is not easy to achieve the current THD of GCIs that is less than 5% with only an output filter under distorted grid conditions. In this paper, a harmonic compensation method using a lock-in amplifier (LIA) is proposed. Due to the outstanding performance of the LIA, accurate information of the harmonics can be obtained. This information is used to eliminate the harmonics by the simple PI controller. To demonstrate the superiority of the proposed method, it is applied to a 5 kW single phase GCI connected to the real grid. The results obtained are compared with those of the conventional harmonic compensation methods.https://www.mdpi.com/1996-1073/14/3/597single-phase grid connected inverterslock-in amplifierRotatory Reference Frame (RRF), Total Harmonic Distortion (THD) |
| spellingShingle | Reyyan Ahmad Khan Muhammad Noman Ashraf Woojin Choi A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters Energies single-phase grid connected inverters lock-in amplifier Rotatory Reference Frame (RRF), Total Harmonic Distortion (THD) |
| title | A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters |
| title_full | A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters |
| title_fullStr | A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters |
| title_full_unstemmed | A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters |
| title_short | A Harmonic Compensation Method Using a Lock-In Amplifier under Non-Sinusoidal Grid Conditions for Single Phase Grid Connected Inverters |
| title_sort | harmonic compensation method using a lock in amplifier under non sinusoidal grid conditions for single phase grid connected inverters |
| topic | single-phase grid connected inverters lock-in amplifier Rotatory Reference Frame (RRF), Total Harmonic Distortion (THD) |
| url | https://www.mdpi.com/1996-1073/14/3/597 |
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