Abstract: [Objectives] As a novel physical energy storage technology connected to the grid through synchronous generators, non-supplementary fired compressed air energy storage (CAES) has reactive power regulation capability, which can alleviate the decline in voltage support capacity of new-type power systems caused by DC feed-in. To address this, a two-stage robust scheduling strategy for CAES tailored to the regulation needs of DC-feed power grids is proposed. [Methods] First, an operational model of CAES considering peak shaving and reactive power regulation modes is established. Second, with the objectives of minimizing grid operating costs and system voltage deviation, an optimal scheduling strategy for CAES integration into the power system considering reactive power regulation mode is proposed. Then, a two-stage robust method is adopted to eliminate the risk of infeasible unit start-up and shutdown strategies caused by uncertainties in renewable energy output and load magnitude. Finally, the effectiveness of the proposed strategy in supporting grid voltage is validated through a modified IEEE-30 bus test case. [Results] Compared to traditional operation modes, the voltage fluctuations at the nodes with CAES and the overall average voltage fluctuations of the grid are significantly reduced under the operating mode that considers reactive power regulation. [Conclusions] The proposed scheduling strategy can further improve the system voltage stability while ensuring economic operation, providing important support for CAES to assist the stable operation of DC-feed power grids.

Key words: power grid, energy storage, new-type power system, new energy, voltage support, two-stage robust optimization, scheduling strategy