Abstract
Evaluating the potential utilization of hybrid energy systems and determining the multi-scale optimal operation strategy is critical to power system planning in the context of energy structure adjustment, especially for large-scale hybrid energy systems. Considering the long-term and short-term complementary characteristics, this paper puts forward a coordinated optimization framework for the integrated energy system in the world's largest multi-energy complementary base on Yellow River's upper reaches. The main procedures are as follows: 1) cross-correlation method is introduced for individually analyzing the long- and short-term complementary characteristics of wind power, photovoltaic, and hydropower in this multi-energy complementary base; 2) a double-layer model combining the long-term optimal operation model and short-term optimal operation model for determining the proportion of multiple energy and optimizing the maximum peak-shaving ability; 3) Large-Scale System Decomposition-Coordination Method is applied for solving the proposed double-layer operation model. The results show that wind power 23%, photovoltaic 35%, hydropower 42% can keep the most stable generation in the long-term complementary operation. This proportion results can improve the system peak regulation capacity with 50.8% (sunny day's morning peak) and 24.2% (rainy day's morning peak) in the optimal short-term operation.
Highlights
It is recently urgent to replace traditional energy sources with renewable energy sources to mitigate the large consumption of non-renewable resources such as coal, oil, and natural gas
Through the combination on the complementary characteristics of renewable energy, this paper divides the optimal scheduling model of wind-photovoltaic-hydropower multi-energy complementary system coordinated operation into the multi-energy complementary capacity optimization configuration based on long-term complementary characteristics and the peak-shaving ability based on short-term complementary characteristics
The results show that especially in sunny days, the comprehensive utilization of wind power, photovoltaic power, and hydropower in a complementary manner can effectively improve the peak-shaving capacity of the system, which had improved the present situation that photovoltaic and wind power do not have peak-shaving capabilities due to their output characteristics
Summary
It is recently urgent to replace traditional energy sources with renewable energy sources to mitigate the large consumption of non-renewable resources such as coal, oil, and natural gas. The annual solar energy received by the earth is equivalent to about 2000 times the power generated by the solid, liquid, and gas fossil fuels burned every year. The total storage of solar energy resources is equivalent to more than 10,000 times the energy currently used by humans[1]. The global wind energy potential is about five times the current global electricity consumption[2]. For the intermittence and volatility of renewable energy sources, large-capacity wind power and photovoltaic access to the power system will seriously affect the power quality and the stable operation of the primary power grid. It will lead to curtailed wind energy, photovoltaic, and even off-grid problems[3][4]
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