Abstract
In order to satisfy the strategic needs of energy sustainable development, renewable energy has developed rapidly and the power systems have been transformed to a new generation of power systems. In the renewable energy power generation technologies, the fastest developing wind power generation are highly intermittent and fluctuating. When high penetration of renewable power connects to the power grid and participates in the system dispatch, there will be more difficulties and challenges in the energy balance control. In this paper, a wind-thermal-nuclear-storage combined time division power dispatch strategy based on numerical characteristics of net load is proposed, where a specific thermal generating mode and an unconventional nuclear generating mode are discussed. In the strategy, the dispatch time division method is introduced in detail and the sample entropy theory is used to calculate the net load complexity. An adaptive thermal generating mode is determined according to the numerical characteristics of the net load. The nuclear generating modes of constant power operation, time division operation, and net load tracking time division operation are compared and analyzed, respectively. Finally, the wind-thermal-nuclear-storage combined time division power dispatch strategy aiming at decreasing the ramping power of thermal generators is achieved, and the increasing of the participation of pumped storage and improving of the continuous and steady operation time of thermal generators are realized. The experiment simulation is developed on an actual provincial power system in the northeast of China. The results verify that the thermal generator ramping power in the case based on SampEn are reduced, and the participation of pumped storage is improved. When both of the thermal generating mode and nuclear generating mode are according to the changing of net loads, the ramping powers of thermal generators are further decreased.
Highlights
In order to meet the strategic needs of sustainable energy development, the supply side of the power system tends to be in the clean and low-carbon development and the proportion of renewable energy is expected to reach up to 60% by 2050 [1,2]
In Case 1, the thermal generators satisfy the changing of net loads principally and in Case 2, the dispatch strategy is based on numerical characteristics of net loads and the thermal generation mode is determined based on SampEn of net loads
A wind-thermal-nuclear-storage combined time division power dispatch strategy based on numerical characteristics of net load is proposed which focuses on the adaption dispatch time interval and thermal generation mode determination after high proportion wind and solar energies accessed to the power grid
Summary
In order to meet the strategic needs of sustainable energy development, the supply side of the power system tends to be in the clean and low-carbon development and the proportion of renewable energy is expected to reach up to 60% by 2050 [1,2]. Facing the large-scale renewable power access to the power grid, the up and down ramping power of thermal generators is the important factor that affects the load demand response [17,18,19,20,21] These studies are based on the traditional economic power dispatch, in which the dispatch time interval is stable and the thermal power output should change frequently according to the fluctuation of renewable energy. A wind-thermal-nuclear-storage combined time division power dispatch strategy based on numerical characteristics of net load is provided to stablize the generation and increase the operation efficiency of the thermal generators. According to the proposed numerical characteristics of net load-based dispatch strategy, the specific thermal generation mode and net load tracking nuclear generation mode are provided On these bases, the thermal ramping power are reduced; the continuous and stable operating time and the operation efficiency are improved.
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