Research On Variable Speed Constant Frequency Wind Turbine Simulation System

Along with the industry development, the humanity level of living unceasing enhancement and the proposed low-carbon economic policies, the development and use of conventional energy source already could not satisfy society's need and the sustainable development request. Therefore the development of renewable clean energy is already a trend in the immediate, in various new energy sources, wind power is undoubtedly the most technologically mature, the most large-scale development and business development prospects. Therefore, the wind power generation in recent years, countries around the world have been vigorously developing. Especially in domestic, in recent years the installed capacity by at least 30% speed swift growth.Given the current wind energy utilization efficiency need to be improved, especially in the domestic wind power generation technology with foreign countries, there is still a wide gap, so earnest and systematic study of wind power generation technology is necessary. However, most of the actual wind farm in the remote suburbs, it brings inconvenient to the majority of wind power researchers. Therefore, establishes an advanced wind power generation simulation system is a foundation for study the wind power under the laboratory environment. This article will use of an induction motor as prime mover instead of the wind machine, with the DSP as controllers, with the brushless doubly-fed generator constitutes a complete simulation system. It will detail the following aspects of the system design and build.1. Make a detailed analysis of the basic theory of wind power and the working principle of wind turbine, and compared the differences and linkages of variable pitch wind turbine and fix pitch wind turbine. Study of wind turbine simulation theory and technology, and classified analysis the existing wind power simulation methods according to the difference of the system architecture, simulation features and the original motivation. Divide the work area of variable pitch wind turbine into the maximum power point tracking section, the constant-speed section and the constant-power section, according to its different operational characteristics in different wind speed circumstances. A detailed analysis of the performance characteristics of variable pitch wind turbines in each section, obtained its simulation method and simulation focus on different section. And through modeling and simulation verify the feasibility and effectiveness of this method.2. The asynchronous motor, as a prime mover of, its control strategy directly affects the performance of the whole system. So, this paper analyzes the basic structure and working principle of asynchronous motor, and studied the mathematical model of induction motors at different coordinate system. Classification analysis and comparison of the asynchronous motor control method from the perspective of energy recovery, and decided to use the direct torque control system as the prime mover of the control strategy. In order to direct torque control with a smaller torque ripple and better low-speed performance, the article using gray prediction theory and fuzzy control algorithm to optimize the conventional direct torque control. And through simulation results verify the feasibility and superiority of the theory in the wind turbine simulation systems.3. Generator system control strategy for a direct impact on the entire system simulation results. The paper introducing the working principle and mathematical model of brushless doubly-fed machine, and summarizes a part of the research results on the the control strategy for brushless doubly-fed wind power generation system in our laboratory. It including the power decoupling control strategy based on synchronous coordinate, the power decoupling control strategy based on ADRC and the power decoupling control strategy based on MFC.4. With a TI company's TMS320F2812 DSP and ABB converter as a prime mover controller, a DSP and a set of rectifier inverter device as the generator controller, using a DSP real-time monitoring and analysis the output of generator, and Integrated Monitor (PC or ARM) together constitute the control unit of wind power generation simulation system. Introduced the hardware design and software design of wind turbine simulation subsystem, wind speed acquisition subsystem, generator control subsystem, and generator condition monitoring subsystem and integrated monitoring subsystem in a modular way. Makes the whole system's general architecture, hardware design to software design has realized.5. To make wind power generation simulation system to become part of the solar-wind power generation system in laboratory, this article has done a detailed analysis on how to construct a comprehensive network monitoring system. Focuses on the system's overall structure, data acquisition module, communication module and terminal module. Include the work principle of C2000-Plus serial converter, the realization method of serial communication program, the using methods of network socket and graphical interface controls(ZedGraph).The wind power generation simulation platform has been implemented based on the above theory in our laboratory. Has done a VSCF wind power generation simulation experiment, and analyzed the experimental results. The results show that the feasibility and practicality of this simulation system.