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A speed-varying frequency constant dual feedback wind power generation system and its parallel control method

A double-fed wind power generation, variable speed and constant frequency technology, applied in wind power generation, single grid parallel feeding arrangement, etc., can solve problems such as grid collapse, grid voltage fluctuation, grid voltage drop, etc., to reduce maintenance costs and improve reliability. Effect

Inactive Publication Date: 2008-09-17
北京清能华福风电技术有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The grid voltage fluctuation and flicker caused by the grid-connected current impact when the unit is connected to the grid can no longer be ignored. In severe cases, it may lead to a large drop in the grid voltage or even the collapse of the grid.

Method used

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  • A speed-varying frequency constant dual feedback wind power generation system and its parallel control method
  • A speed-varying frequency constant dual feedback wind power generation system and its parallel control method
  • A speed-varying frequency constant dual feedback wind power generation system and its parallel control method

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0055] figure 1 It is a structural block diagram of the variable-speed constant-frequency double-fed wind power generation system of the present invention. As shown in the figure, the system mainly includes a stator grid-connected device 1, a generator 2, a machine-side circuit breaker 3, a control board 4, a dual PWM inverter 5, a grid-side circuit breaker 6, and a code disc 7. The generator 2 is a double-fed generator, which feeds power to the grid through both sides of the generator's stator and rotor. On the stator side of the generator 2 , the stator is connected to the grid through the stator grid-connected device 1 . On the rotor side of the generator 2 , the rotor is connected to the grid through a dual PWM frequency converter 5 . In order to ensure the safety of the circuit, a grid-side circuit breaker 6 is connected in series between the du...

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Abstract

The present invention provides a variable speed constant frequency doubly-fed wind power generation system, characterized in that the system includes a stator grid connected device, a motor, a controlling plate, a dual pwm converter, a code disc; the stator of the motor is connected with the power network by the stator grid connected device; the rotor of the motor is connected with the power network by the dual pwm converter; the controlling plate is connected with the power network, the motor, the dual pwm converter and the stator grid connected device; the controlling plate is also connected with the rotor via the code disc. The system eliminates some influence caused by some parameter error of the generating system according to designing a voltage amplitude compensator and a rotor position angle compensator in the controlling plate.

Description

technical field [0001] The invention relates to a variable-speed constant-frequency double-fed wind power generation system and a grid-connected control method thereof, belonging to the technical field of wind power generation. Background technique [0002] Energy issue is a focal issue in today's world. Today, when traditional energy sources such as coal, oil, and natural gas are facing depletion, the development and utilization of renewable energy has become particularly important. As a renewable and non-polluting new energy with large-scale development and utilization prospects, wind energy has naturally become a research hotspot. my country is a country rich in wind energy resources. At present, the proven available wind energy reserves are about 253GW, which is roughly equivalent to the total installed capacity of power generation in my country at the end of 2000. Therefore, the research and development of wind power generation technology is of great strategic signifi...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/42
CPCY02E10/763Y02E10/76
Inventor 苑国锋郑艳文龚细秀
Owner 北京清能华福风电技术有限公司
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