Evaluation of flexibility enhancement benefits for the new power system

doi:10.12006/j.issn.1673-1719.2023.230

Abstract

Abstract:

The refined evaluation of flexibility resources under different permeability of wind power and photovoltaics contribute to clarifying the key phased tasks of the new power system flexibility enhancement. Based on the multi-time scale time chronological operation simulation model, the cost composition of power system flexibility enhancement was refined, and the new energy consumption promotion effect and system operating cost difference of a single flexible resource were quantitatively evaluated at different stages of new power system construction. The results show that the flexible transformation of coal power and pumped storage are more prominent in terms of economy and new energy consumption, respectively under low permeability of wind power and photovoltaics, at the present stage. In the future, under high wind power and photovoltaic permeability, the flexible transformation of coal power gradually loses its cost advantage, and the regulating efficiency and economy of gas power are better reflected, electrochemical energy storage and pumped storage have the best benefit for improving new power system flexibility. Therefore, at the present stage, the focus of the power system flexibility enhancement is the flexible transformation of coal power and pumped storage deployment, to promote the large-scale deployment of energy storage while using the gas power as transitional resources.

Key words: New power system, Flexibility, Multi-time scales, Power system flexibility enhancement benefits

ZHANG Kai, YUAN Jia-Hai, DING Bao-Di, ZHANG Jian, ZHANG Hao-Nan. Evaluation of flexibility enhancement benefits for the new power system[J]. Climate Change Research, 2024, 20(3): 316-326.

Figures/Tables 6

Fig. 1 Analysis framework of the power system flexibility enhancement benefit

Table 1 The installed structure and proportion of the initial scenario under low and high wind and photovoltaic (PV) penetration GW

Table 2 Annual hour-level system operation simulation results for each scheme under low wind and PV penetration

Table 3 The effects of each scheme on reducing curtailment at different time slice %

Fig. 2 Typical daily system operation simulation of the initial scenario at different time slice

Table 4 Annual hour-level system operation simulation results of for each scheme under high wind and PV penetration

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