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Research on the Synchronization Control and Analysis of Chaos for the DC/DC Converters in the Controllable Excitation Power

Author: LiuYanJu
Tutor: ZhangHuaGuang
School: Northeastern University
Course: Proceedings of the
Keywords: Controllable excitation power system DC/DC converters Discrete method T-Sfuzzy model Chaos Impulsive synchronization control
CLC: TM46
Type: Master's thesis
Year: 2011
Downloads: 3
Quote: 0
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Abstract


The controllable excitation power source is the core of the excitation control system. It is important in micro-turbine synchronous generators, and the quality of the controllable excitation power source design can has a vital impact on improving the reliability and stability. With the increasing demand of power quality, users have new requirements for excitation controller, such as calculating, signal processing, and anti-jamming capabilities.The thesis is based on the design of excitation power adjust protection portfolio, which was developed by Shenyang Aerospace Xinguang Group. Using American TI’s TMS320F2812as the main processor, a research has been done on the controllable excitation power source based on DC/DC converters for micro-turbine synchronous generators. The working principle is to control the switching component using PWM impulse control signal, therefore, to implement chopping control of the DC/DC circuit, supplying excitation voltage and excitation current for generators. However, due to the high frequency of switching operation, there is phenomenon in controllable power circuit, for example, interference and output voltage instability. And the above phenomenon is chaos, so to eliminate the chaos by chaotic control is the research key of the thesis.In this thesis, the main contribution is shown as follows:1. According to the requirements of project performance and on-site operating conditions, using TMS320F2812as the main processor, the75kw controllable excitation power system is designed. The excitation control system includes the half-wave rectifier voltage regulator, DC/DC chopping circuit, sampling circuit, digital input circuit, digital output circuit, serial communication circuit, and programming circuit.2. Using Multisim simulation platform to build circuit and study the output voltage waveform of the DC/DC converters in the controllable excitation power source. Get the corresponding simulation by setting different circuit parameters, and then make comparisons. At last, the existence of chaos is proved in DC/DC circuit by analyzing the results.3. The DC/DC circuit in this design is used for further analyzed for the process of chaos. According to state equations, discrete dynamics model is built. Then the evolution process of chaos from periodic motion to chaos state is studied using MATLAB. Meanwhile, the T-S fuzzy model method is built and the the parameters of circuit is further studied, which is the foundation of the following chaotic control.4. A chaos control method based on impulsive output feedback is proposed in the thesis. Based on the T-S fuzzy model method, chaotic synchronization control system is established, and the method’s exponentially stable and robust stable is analyzed and proved. At last, simulation results demonstrated the effectiveness of the proposed method.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter
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