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With the continuous development and progress of society, people’s requirements for living conditions have gradually changed. They begin to pursue the comfort and personalization of the living environment, while also pay more and more attention to the problems of energy and environment. In order to build a suitable living environment, the implementation of central heating is bound to consume all kinds of resources. In the heating process, the efficient use and effective saving of energy has become an important measure for the heating industry to achieve the coordinated development of energy and environment. Taking the central heating as the research object and the secondary side distributed variable frequency pump heating transmission and distribution system as the goal, this paper studies the energy saving of the distributed variable frequency pump heating transmission and distribution system. This paper provides a design method of distributed variable frequency pump heating transmission and distribution system, in order to provide some basis for the design of distributed variable frequency pump heating transmission and distribution system in the future, and solve the problem of high energy consumption in the traditional central heating transmission and distribution system.

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The paper analyzes the dynamic equilibrium of the electricity market by using the principle of economics and establishes the non-autonomous linear discrete periodic mathematic models, the models describe the actions of the electricity market under the assumption that market demand is the linear function with variable coefficient of forecast price and that the market supply is the linear equation with varied coefficient of spot price. The practical stability of the electric market is discussed by using Lyapunov function and the calculus inequality. A number of critical conditions to judge the practical stability of electric market and the existing of practically asymptotically stable periodic solution of electricity market are obtained and these conclusions are explained by example.