1. Center for Intelligent Electricity Networks (CIEN), The University of Newcastle, Newcastle, NSW, Australia 2. School of Electrical & Information Engineering, The University of Sydney, Sydney, NSW, Australia 3. Ningde Amperex Technology Ltd., Ningde, Fujian, China 4. State Grid Electric Power Research Institute, Nanjing, China 5. Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China

National Natural Science Foundation of China (Young Scholar Program 71401017, General Program 51277016), State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (Grant No. LAPS14002), Fujian regional science and technology major projects, China (2013H41010151), and Hong Kong RGC Theme Based Research Scheme Grant No. T23-407/13-N.