Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve
A large number of renewable energy sources (RESs), such as wind and photovoltaics (PV), have increased the importance of hydropower stations with regulating capacity in peak shaving operation. However, optimizing load distribution among cascade hydropower units remains challenging. This study propos...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-09-01
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| Series: | International Journal of Electrical Power & Energy Systems |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142061525004685 |
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| author | Fengshuo Liu Kui Huang Xuanyu Shi Longqing Zhao Yangxin Yu Xueshan Ai Xiang Fu |
| author_facet | Fengshuo Liu Kui Huang Xuanyu Shi Longqing Zhao Yangxin Yu Xueshan Ai Xiang Fu |
| author_sort | Fengshuo Liu |
| collection | DOAJ |
| description | A large number of renewable energy sources (RESs), such as wind and photovoltaics (PV), have increased the importance of hydropower stations with regulating capacity in peak shaving operation. However, optimizing load distribution among cascade hydropower units remains challenging. This study proposes a novel method to enhance RES and hydropower utilization through: 1) Establishing a plant-wide optimal output-water level-outflow relationship curve based on the output-head-flow relationship and the flow-head loss and outflow-tailwater level relationship curves for each unit; 2) Developing a short-term peak shaving model for cascaded hydropower stations that incorporates wind and PV power which defines minimum coefficient of variation of residual load as objective functions, and improving discrete differential dynamic programming successive approximation (DDDPSA) method to solve it; 3) Analyzing the peak shaving capacity of the cascade hydropower station by varying water consumption for power generation. A case study on the Hongshui River demonstrates the practicality and effectiveness of the proposed method. The computation time is reduced by over 98% in typical scenarios, and the proposed algorithm maintains convergence even when the traditional method fails. The model provides technical support for the integrated scheduling of hydropower, wind, and PV systems. |
| format | Article |
| id | doaj-art-ef5324266c0f4bf2a2a40cd6db8ac285 |
| institution | Kabale University |
| issn | 0142-0615 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Electrical Power & Energy Systems |
| spelling | doaj-art-ef5324266c0f4bf2a2a40cd6db8ac2852025-08-20T03:36:06ZengElsevierInternational Journal of Electrical Power & Energy Systems0142-06152025-09-0117011092010.1016/j.ijepes.2025.110920Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curveFengshuo Liu0Kui Huang1Xuanyu Shi2Longqing Zhao3Yangxin Yu4Xueshan Ai5Xiang Fu6State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, ChinaGuangxi Power Grid Power Dispatching and Control Center, Nanning 530023, ChinaState Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, ChinaState Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, China; Hubei Key Laboratory of Water System Science for Sponge City Construction (Wuhan University), Wuhan 430072, China; Corresponding author.State Key Laboratory of Water Resources Engineering and Management, Wuhan University, Wuhan 430072, ChinaA large number of renewable energy sources (RESs), such as wind and photovoltaics (PV), have increased the importance of hydropower stations with regulating capacity in peak shaving operation. However, optimizing load distribution among cascade hydropower units remains challenging. This study proposes a novel method to enhance RES and hydropower utilization through: 1) Establishing a plant-wide optimal output-water level-outflow relationship curve based on the output-head-flow relationship and the flow-head loss and outflow-tailwater level relationship curves for each unit; 2) Developing a short-term peak shaving model for cascaded hydropower stations that incorporates wind and PV power which defines minimum coefficient of variation of residual load as objective functions, and improving discrete differential dynamic programming successive approximation (DDDPSA) method to solve it; 3) Analyzing the peak shaving capacity of the cascade hydropower station by varying water consumption for power generation. A case study on the Hongshui River demonstrates the practicality and effectiveness of the proposed method. The computation time is reduced by over 98% in typical scenarios, and the proposed algorithm maintains convergence even when the traditional method fails. The model provides technical support for the integrated scheduling of hydropower, wind, and PV systems.http://www.sciencedirect.com/science/article/pii/S0142061525004685Cascaded hydropower stationsPlant-wide optimal curvePeak shaving operationShort-term economic operationMinimum residual load coefficient of variation |
| spellingShingle | Fengshuo Liu Kui Huang Xuanyu Shi Longqing Zhao Yangxin Yu Xueshan Ai Xiang Fu Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve International Journal of Electrical Power & Energy Systems Cascaded hydropower stations Plant-wide optimal curve Peak shaving operation Short-term economic operation Minimum residual load coefficient of variation |
| title | Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve |
| title_full | Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve |
| title_fullStr | Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve |
| title_full_unstemmed | Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve |
| title_short | Study on the peak shaving operation of cascade hydropower stations based on the plant-wide optimal curve |
| title_sort | study on the peak shaving operation of cascade hydropower stations based on the plant wide optimal curve |
| topic | Cascaded hydropower stations Plant-wide optimal curve Peak shaving operation Short-term economic operation Minimum residual load coefficient of variation |
| url | http://www.sciencedirect.com/science/article/pii/S0142061525004685 |
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