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| Hydro flexibility in regulating power fluctuation of hybrid system |
| LI Huanhuan, CHEN Diyi*, XU Beibei |
| College of Water Resources & Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract In terms of the fluctuation of net load caused by stochastic wind power in multi-time scales, the morphologic filter method was used to extract the signal of net load with the high, medium and low frequencies. Then, the flexible indices were presented to describe the supply-demand relationship of hybrid power system in multi-time scales. To improve flexibility benefits, the optimal permeation ratio of wind power and the use ratio of hydro reserve capacity were also analyzed and determined in different time scales. The results show that the down-regulation hydro capability is insufficient in the medium and low frequencies, and the corresponding insufficient capacity is able to reach 4.961 MW in 49% of wind proportion. In contrast, there exists the insufficient up- and down-regulation for hydro resource in the high frequency, and the corresponding maximums of insufficient up- and down-capacities are 0.125 2 MW and 4.279 1 MW. Additionally, the most suitable proportion of the use ratio of hydro reserve capacity for this system is 85%.
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