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Multi-index non-linear control method used for direct-driven permanent-magnet wind-turbine current transformer

A non-linear control, converter technology, applied in the direction of reducing/preventing power oscillation, etc., can solve problems affecting the normal operation of electric power and electrical equipment, and the normal operation of wind current converters.

Inactive Publication Date: 2013-12-25
李啸骢 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the grid voltage drops too much, it will affect the normal operation of electric power and electrical equipment, and the normal operation of wind power converters will also be seriously affected

Method used

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  • Multi-index non-linear control method used for direct-driven permanent-magnet wind-turbine current transformer
  • Multi-index non-linear control method used for direct-driven permanent-magnet wind-turbine current transformer
  • Multi-index non-linear control method used for direct-driven permanent-magnet wind-turbine current transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] (1) Simulation Example 1: Wind Turbine Speed ​​Variation

[0199] Purpose: To test the change of wind turbine active power and electromagnetic torque with wind speed and control effect. The wind speed changes as figure 1 As shown, the wind turbine input torque is as figure 2 As shown, the active power of the wind turbine is as image 3 shown.

[0200] The initial wind speed is set to 8m / s, and when the time reaches t=1s, the set wind speed suddenly increases to 14m / s, using MATLAB for simulation. When t=1s, the generated active power increased steadily, and it took nearly 4s to reach the rated power. During this period, the electromagnetic torque of the fan increases from 0.3pu to 0.9pu, and the active power emitted by the fan also changes. When the electromagnetic torque of the fan increases, the modulation ratio of the sinusoidal modulation wave at the input end of the converter is reduced. m 1 and modulation angle θ 1 , that is, by changing the control signal...

Embodiment 2

[0201] (2) Simulation example 2: The grid voltage drops suddenly

[0202] Purpose: To test the operation status of the direct-drive permanent magnet wind power system under the control strategy when the power grid is under low voltage conditions. Figure 4 As shown, the DC link voltage is as Figure 5 As shown, the active power and reactive power of the wind turbine are as follows Figure 6 shown.

[0203] Take the wind speed as the rated value, and the device outputs unit factor power. When the common connection point voltage has a 15% voltage sag in 5s, and the DC link voltage has a brief 20% disturbance, under the action of the non-control law of the present invention, by adjusting the modulation ratio m of the sinusoidal modulation wave at the output end of the converter 2 and adjustment angle θ 2 , the control signal generated by the converter maintains the rated voltage with a good waveform. Figure 6 It shows that under the action of the control law, the unit can k...

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Abstract

The invention discloses a multi-index non-linear control method used for a direct-driven permanent-magnet wind-turbine current transformer. The method includes the following steps: 1) determining a math model for currents and electromagnetic torques of DC-loop input stages, intermediate DC links and output stages of a wind turbine, a permanent magnetism synchronous generator, a power-grid side and a current transformer, and determining a constraint equation of a wind power system; 2) according to control requirements of the wind power system, establishing a differential algebraic system for the non-linear control method; 3) determining a non-linear control law of the wind power system. The multi-index non-linear control method targets at a non-linear control policy of a direct-driven permanent-magnetic wind-power system pulse-width-modulation current transformer and controls a duty ratio and a modulation angle so that control of the pulse-width-modulation current transformer is realized. Therefore, output voltage is great in smoothness and anti-interference, small-disturbance stability of the wind power system is maintained and dynamic characteristics of the wind power system are improved. Even if power-grid voltage is asymmetrical or a power-grid voltage drop degree is too large, smooth voltage can still be output and normal operations of electrical-power and electrical devices are ensured.

Description

technical field [0001] The invention relates to a permanent magnet wind power generator system (wind power system), in particular to a multi-index nonlinear control method for a direct drive permanent magnet wind generator converter. Background technique [0002] With the increasingly serious problems of energy shortage and environmental degradation, wind power, as a renewable energy source, is one of the fastest-growing new energy sources and has been highly valued by countries all over the world. Since the speed of the permanent magnet synchronous generator (PMSG, permanent magnet synchronous generator) changes with the wind speed, it generates alternating current with changing frequency and voltage. It needs to be connected to the network through a converter device. At the same time, it does not need a gearbox. It has direct drive and simple structure. , high efficiency and other advantages, so it can improve the efficiency of wind energy conversion. [0003] For the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
Inventor 李啸骢王忠勇
Owner 李啸骢
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