This paper proposes a medium- and long-term scheduling method for wind and solar power integration into cascaded hydropower stations. Based on optimized typical transmission power curves
with the daily average actual discharge flow of reservoirs as a boundary condition
a long-term hourly-scale simulation of hydro-wind-solar complementary operation is conducted. Subsequently
the response function between renewable energy curtailment rate and hydropower output is extracted and embedded into the medium- and long-term hydro-wind-solar complementary operation model. A simulation-optimization method is adopted to derive adaptive operating rules. A case study on a clean energy base demonstrates: As hydropower output increases
the curtailment rate first decreases and then rises
with moderate hydropower output leading to lower wind and solar curtailment rates. Compared with conventional scheduling
optimizing hydropower operation alone reduces wind and solar curtailment rate by 3.71% and increases total system generation by 1.74%. The complementary operation optimization incorporating the response function further reduces wind and solar curtailment rate by 7.68% and enhances total system generation by 2.15%. Therefore
the proposed method can further exploit hydropower flexibility
coordinate the complementary relationship between hydropower and new energy
and improve the overall complementary efficiency of hydro-wind-solar integrated systems.
CHEN X, FU Q, CHANG C P.What are the shocks of climate change on clean energy investment: a diversified exploration[J]. Energy economics, 2021, 95: 105136.
LI J D, LUO G J, LI T Y, et al.Impact on traditional hydropower under a multi-energy complementary operation scheme: an illustrative case of a ‘wind-photovoltaic-cascaded hydropower plants’ system[J]. Energy strategy reviews, 2023, 49: 101181.
WANG X P, ZHANG Z M, GUO Z H, et al.Energy structure transformation in the context of carbon neutralization: evolutionary game analysis based on inclusive development of coal and clean energy[J]. Journal of cleaner production, 2023, 398: 136626.
XU B, ZHU F L, ZHONG P G, et al.Identifying long-term effects of using hydropower to complement wind power uncertainty through stochastic programming[J]. Applied energy, 2019, 253: 113535.
ZHANG Y S, LIAN J J, MA C, et al.Optimal sizing of the grid-connected hybrid system integrating hydropower, photovoltaic, and wind considering cascade reservoir connection and photovoltaic-wind complementarity[J]. Journal of cleaner production, 2020, 274: 123100.
LIU B X, LUND J R, LIAO S L, et al.Optimal power peak shaving using hydropower to complement wind and solar power uncertainty[J]. Energy conversion and management, 2020, 209: 112628.
WEN X, SUN Y L, TAN Q F, et al.Optimizing the sizes of wind and photovoltaic plants complementarily operating with cascade hydropower stations: balancing risk and benefit[J]. Applied energy, 2022, 306: 117968.
CHEN C Y, LIU H L, XIAO Y, et al.Power generation scheduling for a hydro-wind-solar hybrid system: a systematic survey and prospect[J]. Energies, 2022, 15(22): 8747.
WANG D H, PENG D G, HUANG D M, et al.Research on short-term and mid-long term optimal dispatch of multi-energy complementary power generation system[J]. IET renewable power generation, 2022, 16(7): 1354-1367.
LIU Z Q, CUI Y P, WANG J Q, et al.Multi-objective optimization of multi-energy complementary integrated energy systems considering load prediction and renewable energy production uncertainties[J]. Energy, 2022, 254: 124399.
HUANG K D, LUO P, LIU P, et al.Improving complementarity of a hybrid renewable energy system to meet load demand by using hydropower regulation ability[J]. Energy, 2022, 248: 123535.
JIANG J H, MING B, LIU P, et al.Refining long-term operation of large hydro-photovoltaic-wind hybrid systems by nesting response functions[J]. Renewable energy, 2023, 204: 359-371.
DING Z Y, WEN X, TAN Q F, et al.A forecast-driven decision-making model for long-term operation of a hydro-wind-photovoltaic hybrid system[J]. Applied energy, 2021, 291: 116820.
ZHANG Y S, MA C, YANG Y, et al.Study on short-term optimal operation of cascade hydro-photovoltaic hybrid systems[J]. Applied energy, 2021, 291: 116828.
LU N, WANG G Y, SU C G, et al.Medium-and long-term interval optimal scheduling of cascade hydropower-photovoltaic complementary systems considering multiple uncertainties[J]. Applied energy, 2024, 353: 122085.
REN Y, YAO X H, LIU D, et al.Optimal design of hydro-wind-PV multi-energy complementary systems considering smooth power output[J]. Sustainable energy technologies and assessments, 2022, 50: 101832.
Fujian Smart Electrical Engineering Technology Research Center
College of Electrical Engineering and Automation, Fuzhou University
College of Energy and Mechanical Engineering, Shanghai University of Electric Power
School of Mechanical and Power Engineering, Jiangsu Organic Solid Waste Deep Disposal and Hydrogen Production Engineering Research Center,Jiangsu Key Laboratory of Process Enhancement and New Energy Equipment Technology, Nanjing Tech University
School of Electrical and Electronic Engineering, North China Electric Power University