Analysis And Control For Chaos Characteristics Of Double-fed Wind Generator System

With the rise of global wind power industry, in the next few years, the global wind energy market is being still huge potential for growth. By 2020, it is expected that wind power generating capacity will be doubled. However, under the background of rapid development of new energy sources such as wind and light as a representative of the new power system, these defects of primary energy brings many problems to itself development.Primary energy like wind power is typically intermittent and unstable, and based on the analysis and research of bifurcation, chaos and other phenomenon which also have the random and unstable characteristics, it can provide new ideas for the researchers to search for the new method to solve the problems in the linear methods which can not be solved. This paper studies the process and rules of chaotic characteristics of the fan system as theory of induction motor as the core. On this basis, looking for the reasonable means to control it. In this paper, the main research contents and conclusions are as follow:1、Indirect field-oriented control(IFOC)for induction motor is as the core,setting up a corresponding fan system as the research object. Estimate for the inverse rotor time constant is selected as the key parameter to be observed and analyzed. After setting the system parameters, chaos is initially identified. Applying topological horseshoe theory, with the Poincaré section and Poincaré mapping, chaos motion ’ s characteristic is analyzed in the image of the system attractor. Describing the similar periodic "backtracking" track in the attractor’s partial trajectory. Undertaking qualitative analysis of the details and conditions.Changing the key parameters, it makes the system from the steady state into chaos and shows the process of the system trajectory is affected by internal parameters and changes. It vividly verifies the possibility and regularity of chaos phenomenon.2、Doubly Fed Induction Generator(DFIG) is being as the research object, this paper introduces the sliding mode variable structure control of Nonlinear control method. Firstly,it introduces the basic problems of nonlinear control, as well as the basic principle of the sliding mode variable structure control. On the basis of it, makes numerical calculation and simulation design for the control links of the system. After that, combining with the relevant conclusions for existence of chaos, to link the parameters, and then the control chaotic operation mode of system. Combining with the attractor and trajectory images for details.Adding Control links to system, it makes the system return to the stable operation state, thus verified the controllability of chaotic system and the feasibility of the control strategy.