1. Power Marketing Service and Operation Management Center, Inner Mongolia Power (Group) Co., Ltd, No. 28 of Xilinnan Rd., Hohhot 010000, China (Corresponding author), e-mail: yangdongmei4241412@163.com, https://orcid.org/0000-0002-3610-4843
2. Power Marketing Service and Operation Management Center, Inner Mongolia Power (Group) Co., Ltd, No. 28 of Xilinnan Rd., Hohhot 010000, China