国家自然科学基金重点项目批准号51037003;国家电网公司大电网规划与运行控制技术重大专项批准号SGCC-MPLG027-2012资助的课题 This work is supported by National Natural Science Foundation of China51037003;Major Special Projects of Large Power Grid Planning and Operation Control Technology of State Grid Corporation of ChinaSGCC- MPLG027-2012