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

An AC-DC-AC converter and control structure technology, which is used in wind power generation, conversion equipment for intermediate conversion to DC conversion, single-grid parallel feeding arrangement, etc.

Active Publication Date: 2010-05-12
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • 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

[0018] See Figure 1-Figure 4 .

[0019] The rotor excitation power supply of the doubly-fed wind generator is an AC-DC-AC converter device, which is the connection of two converters through an intermediate DC link.

[0020] The grid-side converter software is divided into two parts, the main program module and the interrupt service program module. The main program module mainly completes the initialization of the system. The functions include the initialization of system registers, the initialization of peripheral module control registers, the initialization of special registers in the DSP, the initialization of user-defined variables, the opening of the interrupt and the waiting to enter the interrupt service subroutine.

[0021] The interrupt service program is the core part of the entire grid-side converter, and most of the work is done in the interrupt service program. Since the switching frequency required to drive the IGBT is generated as a PWM signal of 10K Hz, the time req...

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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 thetwo-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 double-fed AC-DC-AC converter for wind power generation. Background technique [0002] In the variable-speed constant-frequency mode, the rotation speed of the generator changes with the wind speed, and the constant-frequency electric energy is obtained through proper control. The adjustment method is: control the generator speed by adjusting the pitch when starting; adjust the torque of the generator below the rated wind speed after connecting to the grid to make the speed follow the change of the wind speed, and maintain the best 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 actions of pitch adjustment, limit the energy obtained by the wind turbine, ensure the stability of generator power output and good dynamic characteristics, and improve the flexibility of the transmission system. The above-mentioned...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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