DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions
Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The p...
Ausführliche Beschreibung
Autor*in: |
Wang, Qin [verfasserIn] |
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E-Artikel |
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Sprache: |
Englisch |
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2022transfer abstract |
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Enthalten in: Synthesis and characterization of AsO[(W,Mo)O - Goudjil, Meriem ELSEVIER, 2023, Amsterdam [u.a.] |
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Übergeordnetes Werk: |
volume:142 ; year:2022 ; pages:0 |
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DOI / URN: |
10.1016/j.ijepes.2022.108309 |
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ELV058170014 |
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520 | |a Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. | ||
520 | |a Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. | ||
650 | 7 | |a Large-scale photovoltaic |2 Elsevier | |
650 | 7 | |a Decentralized control |2 Elsevier | |
650 | 7 | |a Partial shading |2 Elsevier | |
650 | 7 | |a Frequency support |2 Elsevier | |
650 | 7 | |a DC optimizer |2 Elsevier | |
650 | 7 | |a Virtual inertia |2 Elsevier | |
700 | 1 | |a Fang, Jiakun |4 oth | |
700 | 1 | |a Yao, Wei |4 oth | |
700 | 1 | |a Li, Dahu |4 oth | |
700 | 1 | |a Ai, Xiaomeng |4 oth | |
700 | 1 | |a Wen, Jinyu |4 oth | |
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10.1016/j.ijepes.2022.108309 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001819.pica (DE-627)ELV058170014 (ELSEVIER)S0142-0615(22)00329-5 DE-627 ger DE-627 rakwb eng 540 VZ 35.90 bkl Wang, Qin verfasserin aut DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Large-scale photovoltaic Elsevier Decentralized control Elsevier Partial shading Elsevier Frequency support Elsevier DC optimizer Elsevier Virtual inertia Elsevier Fang, Jiakun oth Yao, Wei oth Li, Dahu oth Ai, Xiaomeng oth Wen, Jinyu oth Enthalten in Elsevier Science Goudjil, Meriem ELSEVIER Synthesis and characterization of AsO[(W,Mo)O 2023 Amsterdam [u.a.] (DE-627)ELV009519483 volume:142 year:2022 pages:0 https://doi.org/10.1016/j.ijepes.2022.108309 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.90 Festkörperchemie VZ AR 142 2022 0 |
spelling |
10.1016/j.ijepes.2022.108309 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001819.pica (DE-627)ELV058170014 (ELSEVIER)S0142-0615(22)00329-5 DE-627 ger DE-627 rakwb eng 540 VZ 35.90 bkl Wang, Qin verfasserin aut DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Large-scale photovoltaic Elsevier Decentralized control Elsevier Partial shading Elsevier Frequency support Elsevier DC optimizer Elsevier Virtual inertia Elsevier Fang, Jiakun oth Yao, Wei oth Li, Dahu oth Ai, Xiaomeng oth Wen, Jinyu oth Enthalten in Elsevier Science Goudjil, Meriem ELSEVIER Synthesis and characterization of AsO[(W,Mo)O 2023 Amsterdam [u.a.] (DE-627)ELV009519483 volume:142 year:2022 pages:0 https://doi.org/10.1016/j.ijepes.2022.108309 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.90 Festkörperchemie VZ AR 142 2022 0 |
allfields_unstemmed |
10.1016/j.ijepes.2022.108309 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001819.pica (DE-627)ELV058170014 (ELSEVIER)S0142-0615(22)00329-5 DE-627 ger DE-627 rakwb eng 540 VZ 35.90 bkl Wang, Qin verfasserin aut DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Large-scale photovoltaic Elsevier Decentralized control Elsevier Partial shading Elsevier Frequency support Elsevier DC optimizer Elsevier Virtual inertia Elsevier Fang, Jiakun oth Yao, Wei oth Li, Dahu oth Ai, Xiaomeng oth Wen, Jinyu oth Enthalten in Elsevier Science Goudjil, Meriem ELSEVIER Synthesis and characterization of AsO[(W,Mo)O 2023 Amsterdam [u.a.] (DE-627)ELV009519483 volume:142 year:2022 pages:0 https://doi.org/10.1016/j.ijepes.2022.108309 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.90 Festkörperchemie VZ AR 142 2022 0 |
allfieldsGer |
10.1016/j.ijepes.2022.108309 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001819.pica (DE-627)ELV058170014 (ELSEVIER)S0142-0615(22)00329-5 DE-627 ger DE-627 rakwb eng 540 VZ 35.90 bkl Wang, Qin verfasserin aut DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Large-scale photovoltaic Elsevier Decentralized control Elsevier Partial shading Elsevier Frequency support Elsevier DC optimizer Elsevier Virtual inertia Elsevier Fang, Jiakun oth Yao, Wei oth Li, Dahu oth Ai, Xiaomeng oth Wen, Jinyu oth Enthalten in Elsevier Science Goudjil, Meriem ELSEVIER Synthesis and characterization of AsO[(W,Mo)O 2023 Amsterdam [u.a.] (DE-627)ELV009519483 volume:142 year:2022 pages:0 https://doi.org/10.1016/j.ijepes.2022.108309 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.90 Festkörperchemie VZ AR 142 2022 0 |
allfieldsSound |
10.1016/j.ijepes.2022.108309 doi /cbs_pica/cbs_olc/import_discovery/elsevier/einzuspielen/GBV00000000001819.pica (DE-627)ELV058170014 (ELSEVIER)S0142-0615(22)00329-5 DE-627 ger DE-627 rakwb eng 540 VZ 35.90 bkl Wang, Qin verfasserin aut DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions 2022transfer abstract nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. Large-scale photovoltaic Elsevier Decentralized control Elsevier Partial shading Elsevier Frequency support Elsevier DC optimizer Elsevier Virtual inertia Elsevier Fang, Jiakun oth Yao, Wei oth Li, Dahu oth Ai, Xiaomeng oth Wen, Jinyu oth Enthalten in Elsevier Science Goudjil, Meriem ELSEVIER Synthesis and characterization of AsO[(W,Mo)O 2023 Amsterdam [u.a.] (DE-627)ELV009519483 volume:142 year:2022 pages:0 https://doi.org/10.1016/j.ijepes.2022.108309 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.90 Festkörperchemie VZ AR 142 2022 0 |
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Enthalten in Synthesis and characterization of AsO[(W,Mo)O Amsterdam [u.a.] volume:142 year:2022 pages:0 |
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Synthesis and characterization of AsO[(W,Mo)O |
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Wang, Qin @@aut@@ Fang, Jiakun @@oth@@ Yao, Wei @@oth@@ Li, Dahu @@oth@@ Ai, Xiaomeng @@oth@@ Wen, Jinyu @@oth@@ |
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This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. 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dc optimizer-based decentralized frequency support scheme of large-scale pv plants considering partial shading conditions |
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DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions |
abstract |
Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. |
abstractGer |
Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. |
abstract_unstemmed |
Solar energy loss of the large-scale PV power plant (LPVPP) caused by partial shading can be mitigated by unit-level DC optimizers (DCO). This paper presents a novel DCO-based decentralized control (DBDC) scheme for an LPVPP to provide active frequency support without equipping energy storage. The proposed DBDC scheme consists of two levels: the plant-level modified DC-link voltage control for the PV inverter and the unit-level improved virtual inertia control and lookup table-based droop control deployed in the DCO controller for each PV generation unit. The stored energy of the DC-link capacitor can be adjusted for inertia emulation based on grid frequency fluctuation with plant-level voltage control. Meanwhile, the frequency deviation is converted into the changes of DCO output voltages. Then, according to the voltage deviations of DCOs, the adaptive power adjustment for PV units is realized through unit-level virtual inertia and droop control scheme. Finally, the maximum use of the PV reserve power and the proposed DBDC scheme without using any communication network can be achieved for LPVPPs, even under frequent partial shading conditions. Case studies are undertaken on a PV-integrated two-area system. Comparison simulation results verify the effectiveness and universality of the proposed DBDC scheme under different scenarios. |
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DC optimizer-based decentralized frequency support scheme of large-scale PV plants considering partial shading conditions |
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https://doi.org/10.1016/j.ijepes.2022.108309 |
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Fang, Jiakun Yao, Wei Li, Dahu Ai, Xiaomeng Wen, Jinyu |
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