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The Control of 10KW Wind Turbine Generator

Author: SongLiGang
Tutor: YangYong
School: Harbin Engineering University
Course: Mechanical and Electronic Engineering
Keywords: Permanent magnet direct drive Directional decoupling control voltage Space Vector Pulse Width Modulation SPLL
CLC: TM315
Type: Master's thesis
Year: 2011
Downloads: 67
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Abstract

In the field of wind power grid, wind power in China and there is still a wide gap between how the wind power systems and control technology with its own technology, has become China's wind power industry pressing problem. In this paper, permanent magnet direct drive wind turbines for the study of its variable flow system and control system were studied to determine the converter topology for dual PWM \According to the proposed control strategy to network-side converter as an example the design of the control system software and hardware, and through the established experimental platform to validate the correctness of the theory. First, the introduction of space vector pulse width modulation (SVPWM) technique based on the principle, the use of technology on SVPWM inverter control. And gives full power converter system control objectives: the motor-side converter in the rectifier state, to achieve the permanent magnet synchronous generator speed adjustment function, and to ensure that the maximum power point tracking fan; grid-side converter operates in active inverter status and wind turbine to ensure unity power factor and net. Secondly, the establishment of bilateral converter mathematical model, based on the motor side converter using a zero d-axis current vector control methods to control the fan speed purposes; grid side converter uses the grid voltage oriented control method to achieve the wind turbine units power factor and net. Again, given the network side converter main circuit. From the DC voltage fast follower and anti-jamming two considerations to determine the parameters of the DC energy storage capacitor. Depending on the L-order filter, from the current loop fast follower and high harmonics identified two aspects of AC side filter inductor parameters. Has designed a control circuit including voltage, current signal detection circuit, the grid frequency detection circuit, protection circuits, communication circuits and human-computer interaction interface circuit design. Then, the network-side converter control system software design. Proposed control system software structure, gives the power phase sequence detection method. The lack of the traditional PLL design of a phase-locked loop based on coordinate transformation software, can unbalance in the case of three-phase grid lock grid accurate angle to the converter decoupling control coordinate transformation . At the same time gives the converter double-loop control method and DSP Implementation of SVPWM method. Finally, the establishment of a network-side converter experimental platform for inverter control strategies and algorithms are verified. From the experimental results analysis, and net current with the grid voltage frequency inverter, wind turbines can achieve unity power factor and network functions. Voltage loop static error is small, fast dynamic response. Fully verify the inverter control strategy is effective and correct, to achieve the desired design goals.

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CLC: > Industrial Technology > Electrotechnical > Motor > Generators, large the generator group ( Zonglun,) > Wind turbines
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