K-means algorithm is used to analyze pretreated monthly load data of power consumers from a certain domestic area in China. It can get different clusters in three months, and those can be roughly divided power consumers into different types, such as residents, businesses and factories based on power customers' behavior analysis. A measure is introduced to evaluate the reliability of the algorithm. According to the above clustering results, it can be found out that the power consumption characteristics of all kinds of consumers in the corresponding months. In view of these characteristics, this paper can play a guiding role in formulating the corresponding power service strategy for different types of power consumers in power supply companies.

From the theoretical analysis of the primary energy consumption of refrigeration system, energy saving rate and value, combined with the application of specific case, the absorption refrigeration system and the compressor refrigeration system in Combined Cooling, Heating & Power Generation (CCHP) system are analyzed. The result of analysis shows that the CCHP system with energy-saving will or will not work in some operation condition and in order to makes the CCHP system more energy-saving, the influence of factors on energy-saving can be to remove by adjusting the working condition.

Small hydropower station, when producing power energy to power system through the distribution network, may lead to the change of the detected current in relay protection and the protection coverage. In this paper, IEEE7 based network is formed in the platform of PSCAD/EMTDC to analyze the effects of distribution network in current protection when a small hydropower station is linked in. The running of relay protection in Section I and II is simulated to obtain the difference of current variation of network with or without small hydropower station. Also the key parameters are calculated to point out the maximum generation capacity of the small hydropower station in case of reliable and sensitive current protection.

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