Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses
Power curtailment methods contribute to the frequency stability of power systems with a high share of photovoltaic generation. This paper focuses on an online strategy that estimates the output characteristic of a photovoltaic generator while operating in power curtailment mode by using voltage and...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Electronics |
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| Online Access: | https://www.mdpi.com/2079-9292/11/10/1544 |
| _version_ | 1797500286125735936 |
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| author | Donghui Ye Jose Miguel Riquelme-Dominguez Sergio Martinez |
| author_facet | Donghui Ye Jose Miguel Riquelme-Dominguez Sergio Martinez |
| author_sort | Donghui Ye |
| collection | DOAJ |
| description | Power curtailment methods contribute to the frequency stability of power systems with a high share of photovoltaic generation. This paper focuses on an online strategy that estimates the output characteristic of a photovoltaic generator while operating in power curtailment mode by using voltage and current measurements and the nonlinear least-squares curve-fitting. In contrast to previously reported methods, this work introduces an improvement consisting of the estimation of the power losses of the electronic converter that connects the photovoltaic panel with the grid. Thus, the impact of a mismatch between the dc-side and the ac-side is reduced. The procedure is tested at different power levels and with fluctuations of irradiance and temperature. The results show that the converter efficiency, expressed as an exponential function with two quadratic equations, is associated with irradiance and temperature. It is also found that the two-stage converter efficiency is mainly affected by the irradiance level when the photovoltaic system operates on the left side of the power-voltage characteristic. In contrast, the temperature level influences the converter efficiency significantly when working on the right side of the maximum power point. The estimated efficiency curves can improve the accuracy of the power curtailment method and can be used for designing the two-stage converter. The effectiveness of the proposed power curtailment method has been tested in a two-stage photovoltaic system through MATLAB/Simulink. |
| first_indexed | 2024-03-10T03:59:43Z |
| format | Article |
| id | doaj.art-2f5ac6d22424485f95cf09e205777b2d |
| institution | Directory Open Access Journal |
| issn | 2079-9292 |
| language | English |
| last_indexed | 2024-03-10T03:59:43Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Electronics |
| spelling | doaj.art-2f5ac6d22424485f95cf09e205777b2d2023-11-23T10:46:43ZengMDPI AGElectronics2079-92922022-05-011110154410.3390/electronics11101544Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter LossesDonghui Ye0Jose Miguel Riquelme-Dominguez1Sergio Martinez2Department of Electrical Engineering, E.T.S.I. Industriales, Universidad Politécnica de Madrid, 28040 Madrid, SpainDepartment of Electrical Engineering, E.T.S.I. Industriales, Universidad Politécnica de Madrid, 28040 Madrid, SpainDepartment of Electrical Engineering, E.T.S.I. Industriales, Universidad Politécnica de Madrid, 28040 Madrid, SpainPower curtailment methods contribute to the frequency stability of power systems with a high share of photovoltaic generation. This paper focuses on an online strategy that estimates the output characteristic of a photovoltaic generator while operating in power curtailment mode by using voltage and current measurements and the nonlinear least-squares curve-fitting. In contrast to previously reported methods, this work introduces an improvement consisting of the estimation of the power losses of the electronic converter that connects the photovoltaic panel with the grid. Thus, the impact of a mismatch between the dc-side and the ac-side is reduced. The procedure is tested at different power levels and with fluctuations of irradiance and temperature. The results show that the converter efficiency, expressed as an exponential function with two quadratic equations, is associated with irradiance and temperature. It is also found that the two-stage converter efficiency is mainly affected by the irradiance level when the photovoltaic system operates on the left side of the power-voltage characteristic. In contrast, the temperature level influences the converter efficiency significantly when working on the right side of the maximum power point. The estimated efficiency curves can improve the accuracy of the power curtailment method and can be used for designing the two-stage converter. The effectiveness of the proposed power curtailment method has been tested in a two-stage photovoltaic system through MATLAB/Simulink.https://www.mdpi.com/2079-9292/11/10/1544converter efficiencygrid-connected power systemnonlinear least-squares curve-fittingphotovoltaic (PV)power curtailment method |
| spellingShingle | Donghui Ye Jose Miguel Riquelme-Dominguez Sergio Martinez Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses Electronics converter efficiency grid-connected power system nonlinear least-squares curve-fitting photovoltaic (PV) power curtailment method |
| title | Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses |
| title_full | Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses |
| title_fullStr | Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses |
| title_full_unstemmed | Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses |
| title_short | Estimation of the Output Characteristic of a Photovoltaic Generator under Power Curtailment and Considering Converter Losses |
| title_sort | estimation of the output characteristic of a photovoltaic generator under power curtailment and considering converter losses |
| topic | converter efficiency grid-connected power system nonlinear least-squares curve-fitting photovoltaic (PV) power curtailment method |
| url | https://www.mdpi.com/2079-9292/11/10/1544 |
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