1. Shandong Key Laboratory of Intelligent Buildings Technology, School of Information and Electrical Engineering, Shandong Jianzhu University, Jinan, P.R. China
2. School of Control Science and Engineering, Shandong University, Jinan, P.R. China
3. Control Strategy Department of Electric Control and Software Research Institute, Weichai Power Co. Ltd, Weifang, P.R. China