Research on the designation of business model and bi-level optimization scheduling strategy of a VPP in energy marketMing Zhang, Mingxing Guo, Bingqing Bai, Shufeng Guan, Ran Lyu, Su Wang and Gaoxiu XuE3S Web Conf., 256 (2021) 02010DOI: https://doi.org/10.1051/e3sconf/202125602010