An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids
Although the stability of the grid-connected photovoltaics (PV) and energy storage systems under weak grids has been widely researched, the classical improvement methods focus more on suppressing the harmonics introduced by the phase-locked loop (PLL). Furthermore, the current distortion caused by t...
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| Format: | Article |
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.939376/full |
| _version_ | 1828329768494301184 |
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| author | Chunxu Li Xinrui Liu Rui Wang Yi Zhang Li Zhang |
| author_facet | Chunxu Li Xinrui Liu Rui Wang Yi Zhang Li Zhang |
| author_sort | Chunxu Li |
| collection | DOAJ |
| description | Although the stability of the grid-connected photovoltaics (PV) and energy storage systems under weak grids has been widely researched, the classical improvement methods focus more on suppressing the harmonics introduced by the phase-locked loop (PLL). Furthermore, the current distortion caused by the DC voltage loop is difficult to be eliminated. In this study, based on the hybrid energy storage system of battery-supercapacitor, a dual-loop compensation method is proposed. First, the small-signal model and output impedance matrix are built in d-q axis. Second, for different disturbance loops, a DC voltage loop disturbance compensation method based on power feedforward is proposed to suppress the harmonics caused by the DC voltage controller (DVC). In addition, a voltage feedforward PLL disturbance compensation method is proposed, which can reduce the PLL perturbations and revise the output impedance to improve system stability. Finally, the output impedance frequency characteristic analysis and the hardware-in-the-loop (HIL) simulation results show that the proposed control method can effectively improve the stability of the system under weak grids. |
| first_indexed | 2024-04-13T20:30:13Z |
| format | Article |
| id | doaj.art-1bd84f0365a3481f85a6192601551321 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-04-13T20:30:13Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Energy Research |
| spelling | doaj.art-1bd84f0365a3481f85a61926015513212022-12-22T02:31:12ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2022-07-011010.3389/fenrg.2022.939376939376An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak GridsChunxu Li0Xinrui Liu1Rui Wang2Yi Zhang3Li Zhang4The College of Information Science and Engineering, Northeastern University, Shenyang, ChinaThe College of Information Science and Engineering, Northeastern University, Shenyang, ChinaThe College of Information Science and Engineering, Northeastern University, Shenyang, ChinaState Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing, ChinaSchool of Electrical and Electric Engineering, Nanyang Technological University, SingaporeAlthough the stability of the grid-connected photovoltaics (PV) and energy storage systems under weak grids has been widely researched, the classical improvement methods focus more on suppressing the harmonics introduced by the phase-locked loop (PLL). Furthermore, the current distortion caused by the DC voltage loop is difficult to be eliminated. In this study, based on the hybrid energy storage system of battery-supercapacitor, a dual-loop compensation method is proposed. First, the small-signal model and output impedance matrix are built in d-q axis. Second, for different disturbance loops, a DC voltage loop disturbance compensation method based on power feedforward is proposed to suppress the harmonics caused by the DC voltage controller (DVC). In addition, a voltage feedforward PLL disturbance compensation method is proposed, which can reduce the PLL perturbations and revise the output impedance to improve system stability. Finally, the output impedance frequency characteristic analysis and the hardware-in-the-loop (HIL) simulation results show that the proposed control method can effectively improve the stability of the system under weak grids.https://www.frontiersin.org/articles/10.3389/fenrg.2022.939376/fullPV and energy storage systemweak power gridsgrid-connected inverterphase-locked loopstability analysis |
| spellingShingle | Chunxu Li Xinrui Liu Rui Wang Yi Zhang Li Zhang An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids Frontiers in Energy Research PV and energy storage system weak power grids grid-connected inverter phase-locked loop stability analysis |
| title | An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids |
| title_full | An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids |
| title_fullStr | An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids |
| title_full_unstemmed | An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids |
| title_short | An Improved Dual-Loop Feedforward Control Method for the Enhancing Stability of Grid-Connected PV and Energy Storage System Under Weak Grids |
| title_sort | improved dual loop feedforward control method for the enhancing stability of grid connected pv and energy storage system under weak grids |
| topic | PV and energy storage system weak power grids grid-connected inverter phase-locked loop stability analysis |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2022.939376/full |
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