1. Electric Power Research Institute of Yunnan Power Grid Co., Ltd., No. 105 of Yunda West Rd., Kunming, 650217, China (Corresponding author), e-mail: yyuuv32@163.com, https://orcid.org/0000-0002-0776-3348
2. Electric Power Research Institute of Yunnan Power Grid Co., Ltd., No. 105 of Yunda West Rd., Kunming, 650217, China