1. Weisheng Wang, Gaofeng Fan, Haixiang Zhao: Power System Technology (in Chinese), Vol. 31 No. 18 (2007), pp.73-77.
2. Junxia Zhang: Power & Energy (in Chinese), Vol. 34 No. 3 (2013) , pp.278-280.
3. Liping Wang, Jiancheng Zhang: Power System and Clean Energy (in Chinese), Vol. 27 No. 2 (2011), pp.52-55.
4. Jason Kennedy, Brendan Fox, and D John Morrow: IEEE Power Tech, Vol. 38 No. 12 (2007), pp.461-462.
5. Yigeng Huangpu, Xiaotong An, Ruiqing Ma, Guangzhao Luo: Journal of Northwestern Polytechnical University (in Chinese), Vol. 31 No. 3(2013), pp.470-475.