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In the present work, solution plasma process (SPP) with bubbling gas was used to prepare oligochitosan. The effect of SPP irradiation with bubbling gas on the degradation of chitosan was evaluated by the intrinsic viscosity reduction rate and the degradation kinetic. The formation of OH radical was studied. Changes of the physicochemical properties of chitosan were measured by scanning electron microscopy,...
the demand response(DR) is becoming the focus of the smart grid construction, as an important measure of DR, Time-of-use(TOU) power price are used more extensively. It is necessary to play to the role of TOU to guide the power consumption according to the demand response, improve the efficiency of electric power resource allocation and the social benefit of power. In this paper, the problem about...
Voltage control faces severe challenges owing to the access of the large number of distributed generation in the active power distribution network. The start and development process of voltage instability or collapse and related mathematical conditions were eager to know. Active distribution network is a typical nonlinear nonautonomous systems, Bifurcation theory one of the effective way solving the...
The principle of DFIG wind power generation system is analyzed and the mathematic model is developed. The function of the active Crowbar in LVRT is studied and the parameters of the active Crowbar are given. The simulation result shows that the DFIG system with active crowbar can protect converter against overvoltage and over current. Finally, main power circuit and driving circuit of the active Crowbar...
In modem electric power systems,a reasonable accurate representation of load is necessary for power system stability and dynamic analysis. Load modeling is one of the most important cause effecting the precision and credibility of the simulation result. For a long time, load modeling studies have been behind the development of the electric power industry. The basic theoretical knowledge of electrical...
The structure of traditional distribution network is changed from a single supply radial network to a more power ring network when grid is connected with distributed generations (DG), and island phenomenon occurs higher in the process of reconstruction, which becomes uncontrolled and high risk operation and increased the difficulty of distribution network reconstruction. The improved immune genetic...
At present, the traditional power production mode has been difficult to meet the demand of new situation, it is urgently necessary to adapt new power production mode, distributed generation (DG) technology can improve the reliability of large-scale interconnected power system. However, distributed power supply for the grid is not a controlled source, with the increase of DG, its negative effects on...
At present, extensive researches have been conducted on implementation of demand response programs, aimed to electricity price reduction, transmission lines congestion resolving, security enhancement, improvement of market liquidity, manage peak demand by applying price signals and automated load shedding technologies, etc. Firstly this paper presents a summary of Demand Response (DR) in deregulated...
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