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Research on the Modeling and the Grid-Connected Issue of Doubly-Fed Wind Generator

Author: ChengZuoShu
Tutor: HanXiaoQing
School: Taiyuan University of Technology
Course: Proceedings of the
Keywords: Wind Power Doubly fed induction generator Wind power control technology Frequency adjustment Dynamic characteristics of the wind power Wind power grid
CLC: TM614
Type: Master's thesis
Year: 2010
Downloads: 369
Quote: 3
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Abstract

China's rapid economic development makes the demand for energy increasing, vigorously develop renewable energy has become the fundamental way to solve our energy problems. As a renewable energy source, wind power has rich reserves can be regenerated, widely distributed, green cleaning, etc., on the development of wind energy, the use of more and more countries to the attention of scholars. Wind energy utilization atmospheric motion has kinetic energy into other forms of energy, and its specific uses include: wind power, sail navigational aids, windmill water pumping, wind induced thermal heating. The most important form of wind energy is wind power. With the rapid development of wind power technology, the application of wind energy-based wind power in the world is more and more widespread, increasing the proportion of wind power in the electricity energy. Randomness and contingency However, wind energy, wind power and network operation generated a lot of technical problems, such as the the poor meritorious ability to regulate and poor power quality, that these restricting the large-scale development of wind power has become a major problem. According to the National Grid \With the development of power electronics technology, the doubly-fed induction generator (Double-Fed Induction Generator) wind power more widely. Therefore, the establishment of a doubly-fed induction wind turbine simulation model, has a very important practical significance of in-depth study of the doubly-fed wind turbine active - frequency regulation, reactive power - voltage regulators and other issues. This paper describes a mathematical model of the doubly-fed wind turbine and vector control principle; transient and dynamic characteristics of simulation-depth study of the doubly-fed wind turbine and network operation, analysis of the causes of various phenomena and propose solutions; wind generator's FM control strategy, and the effectiveness of the control strategy is verified by simulation. The specific contents are as follows: (1) analysis of the basic principle of the double-fed wind generator stator flux oriented vector control method to draw double-fed wind turbines, based on double-fed motor stator, rotor voltage equation and flux equation the network side and the rotor side control model, decoupling control of the generator active component and reactive component, independent regulation of active and reactive power. (2) study the gust gradient wind and random mathematical model of the wind, and on this basis to establish the simulation model to analyze the response of the doubly-fed wind turbines under various wind conditions, the simulation results show that the establishment of the model can reflect the typical characteristics of the power quality wind conditions change; based on the principle of double-fed wind turbine, wind power conversion, create a model of the doubly-fed wind turbine, wind energy to electrical energy conversion. (3) study the pitch angle control principle, pursuant to which the control model, the model to achieve a constant voltage control of the pitch angle of the high wind speed constant power and low wind speed; analysis of the double-fed wind generator speed, torque and the relationship of the active power is proposed to reduce the wind energy utilization factor for wind turbines reserve active power; doubly-fed wind turbine grid running system, wind farms involved in the system frequency adjustment. Simulation results show that this method can improve wind energy utilization factor according to the system of active demand, and ultimately the system frequency back to normal. (4) the IEEE 3 machine 9-bus system, for example, research and network failures and power system load mutation wind turbine operation and power system stability analysis under a variety of wind conditions, the wind turbine system frequency, voltage . The simulation results show that the wind farm participation frequency adjustment by adjusting the the wind motor speed and wind energy utilization coefficient for wind power compensation system active when the system appears meritorious shortfall to maintain system frequency. Doubly-fed wind turbine control of in-depth study of the technology to improve the operating characteristics of the wind power grid to achieve the requirements of the State Grid Corporation of wind power grid, and provide technical support for large-scale wind power applications.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Variety of power generation > Wind power
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