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The opening of the sale side of electricity market is an important goal of the new round of power system reform in China, and it is necessary to speed up the establishment and development of the electricity selling companies to achieve this goal. First of all, this paper defines the key problems, which are needed to be solved in the establishment of the sale side market, such as demand side response, optimization of users' power consumption mode, profit mode of electricity selling companies and fair competition in the market. On this basis, this paper analyzes the business of electricity selling company, from the aspects of the transition of business ideas, improving the energy efficiency level, providing integrated energy solutions and innovating business management mode; and then, the service strategies of electricity selling companies are put forward. [ABSTRACT FROM AUTHOR]

Nowadays, China’s energy demand sustained rapid growth, and the coal-based energy structure has adverse effects on the environment. The flexibility of demand side resource (DSR) will be greatly improved, and DSR can reduce electricity consumption actively and temporarily, and realize energy saving and emission reduction. But there are still some problems to introduce DSR in China. This paper proposes three practices for introducing demand side resources to improve the flexibility of power systems through demand resources. [ABSTRACT FROM AUTHOR]

Methods of a wireless sensor concept for detecting and locating electrical system faults including phase-phase short circuit and single phase to earth are presented. The concept is based on hierarchical wireless sensor network (WSN) that is attached to the incoming and outgoing power lines of secondary substations. This paper discussed WSN topology structure and designed the WSN node's energy supply model, analyzed the theory of locating phase-phase short circuit fault and single phase to earth fault, verified the feasibility of the theory by simulation. [ABSTRACT FROM AUTHOR]