Research on improvement of regulation ability of new power system in Guizhou province

Abstract

Guizhou Province is an important energy base for the "west-to-east power transmission" in China. Beneficial from the strategic goal of "carbon peaking and carbon neutrality" proposed by the Chinese government, the new energy such as wind and photovoltaic power in Guizhou is stepping to an expressway gradually. The equipped capacitor of renewable generation is aim to add 23.3 GW during the period of "Fourteenth Five-Year Plan" and expand to 40.0 GW by 2025, accounting for about 36.2% of the total equipped capacity of renewable generation. For the characteristic such as intermittent, fluctuating and random, etc. of the output of new energy, the large-scale grid connection will introduce new challenges to the safe and continuous operation of power system. In order to meet the needs of multi-scenario applications such as peak regulation and frequency modulation of new power system in Guizhou Province, this paper proposed a scheme of improvement of regulation ability through researching regulation ability improving methods, such as flexible transformation of coalfired power, hydro-power expansion, pumped storage and new energy storage system (ESS) construction, etc. The results show that by 2025, in Guizhou Province, about 10% of the new ESS capacity will be installed on the power source side. Independent ESS projects will be built according to the peak shaving needs of the power system on the grid side, and several new ESS projects are advised for demonstration purposes on the load side due to it is difficult to recover the cost of ESS by relying only peak-valley price difference. This research results can work as a decision-making reference for the improvement of regulation capacity of new power system and the planning t of new energy storage in Guizhou Province.