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Control structure of double-fed AC-DC-AC converter for wind power generation

A technology of AC-DC-AC converter and control structure, which is applied in the direction of wind power generation, conversion equipment for intermediate conversion to DC conversion, single-network parallel feeding arrangement, etc.

Active Publication Date: 2007-07-04
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In order to keep the control system in the best operating state, the control strategy should be changed in real time, and the control parameters should be adjusted to keep the quality index of the control system within the optimal range, but the existing control system is difficult to meet the above requirements

Method used

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  • Control structure of double-fed AC-DC-AC converter for wind power generation
  • Control structure of double-fed AC-DC-AC converter for wind power generation
  • Control structure of double-fed AC-DC-AC converter for wind power generation

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Embodiment Construction

[0017] See Figures 1-4.

[0018] The rotor excitation power supply of the double-fed wind turbine is an AC-DC-AC converter device, which is the connection of two converters through the intermediate DC link.

[0019] The grid-side converter software is divided into two parts, the main program module and the interrupt service program module. In the main program module, the initialization of the system is mainly completed, and the functions include the initialization of the system register, the initialization of the peripheral module control register, the initialization of the special register in the DSP, the initialization of the user-defined variable, the interrupt opening and waiting to enter the interrupt service subroutine.

[0020] The interrupt service program is the core part of the entire grid-side converter, and most of the work is completed in the interrupt service program. Since a PWM signal with a switching frequency of 10K Hz is required to generate the driving IGB...

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Abstract

This invention discloses a dual-feed AC-DC-AC converter control structure for wind power generation, and the rotor exciting magnetic converter using the fuzzy PI adaptive control strategy of current inner loop. When the generator no-load networking, the current inner loop uses the conventional PI regulator, and after networking, as to three modes, sub-synchronization, synchronization, super-synchronous, it uses fuzzy adaptive PI control. The network-side converter uses SPWM control strategy which fixed switching frequency and combining electric network electromotive front-feed. In the invention, both converting processes use four-quadrant operation PWM converters based on full-controlled devices, so it can not only improve the system dynamic response, reduce wastage and impact, achieve the two-way electric transmission, but also it can achieve wind power generation network side unit power factor sinusoidal current networking power generation operating.

Description

technical field [0001] The invention belongs to a control structure of a doubly-fed AC-DC-AC converter for wind power generation. Background technique [0002] In the variable speed and constant frequency mode, the rotational speed of the generator changes with the wind speed, and the constant frequency electric energy is obtained through proper control. The adjustment method is: when starting, control the generator speed by adjusting the pitch; after connecting to the grid, when the wind speed is below the rated wind speed, adjust the torque of the generator so that the speed changes with the wind speed, and maintain the best blade tip speed ratio λ to obtain the maximum wind energy; Above the rated wind speed, dual adjustment of stall and pitch is adopted to reduce the frequent action of pitch adjustment, limit the energy obtained by the wind turbine, ensure the stability of the generator power output and good dynamic characteristics, and improve the flexibility of the tra...

Claims

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Application Information

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IPC IPC(8): H02M5/44H02J3/38
CPCY02E10/763Y02E10/76
Inventor 曹仁贤张兴谢震屠运武黄学飞杨淑英
Owner SUNGROW POWER SUPPLY CO LTD
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