Dual feedback asynchronous wind power generator rotor side inverter control method under unbalanced electric grid voltage

A technology for wind turbines and grid voltage, which is applied in motor generator control, generator control parts, electronic commutation motor control, etc. Simple, easy-to-implement, effective results

Inactive Publication Date: 2009-07-08
北京清能华福风电技术有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the prior art, and to provide a control method for the rotor-side inverter of the doubly-fed asynchronous wind power generator under unbalanced

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  • Dual feedback asynchronous wind power generator rotor side inverter control method under unbalanced electric grid voltage
  • Dual feedback asynchronous wind power generator rotor side inverter control method under unbalanced electric grid voltage
  • Dual feedback asynchronous wind power generator rotor side inverter control method under unbalanced electric grid voltage

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Embodiment Construction

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] According to the balance theory, the three-phase unbalanced variables of the grid can be decomposed into the sum of their positive sequence, negative sequence and zero sequence components. However, a doubly-fed asynchronous generator system with three-phase symmetry and mid-point isolation can be considered to have no zero-sequence component. Therefore, under the condition of balancing the grid voltage, only the positive and negative sequence components in the system current, voltage and flux linkage are considered. Choose an appropriate coordinate system so that the initial phase of the positive sequence component is 0, then the two-phase stationary coordinate system has:

[0031]

[0032] In the formula: F broadly represents voltage, current or flux linkage; is the initial phase of the negative sequence component, ω s The subscripts + an...

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Abstract

The invention designs a control method of an inverter on a rotor side of a double fed wind induction generator. In the control method, a traditional PI adjustor is changed into a PIR adjustor, and a setting frequency Omega c in the PIR adjustor is set as a bisynchronous revolution angular speed Omega s, that is, a double frequency negative sequence component in disturbance quantity can be restrained completely, so the situation that power outputted to a power grid oscillates caused by impulsive motion of the electromagnetic torque of an engine because of unequal power grid voltage can be avoided. At the same time, the PIR adjustor can track a positive sequence component with frequency being zero and the double frequency negative sequence component in the forward path which are input in an astatic manner, thereby avoiding that unequal voltage aggravates the imbalance of stator current to cause a stator winding to heat because of serious imbalance. In addition, the control method realizes the control of the inverter on the rotor side of the generator under the condition of the unequal power grid voltage only through the replacement of the adjustor, the alteration thereof is simple, the effect is obvious, the design of complex elements is not involved, and the actualization is easy.

Description

technical field [0001] The invention relates to a control method for a rotor-side inverter of a doubly-fed asynchronous wind power generator, in particular to a control method capable of effectively suppressing the torque ripple of the generator caused by the unbalanced voltage of the grid without aggravating the height of the stator current The invention discloses an unbalanced doubly-fed asynchronous wind generator rotor-side inverter control method, which belongs to the technical field of wind power generation. Background technique [0002] With the subsequent growth of energy demand, large-scale wind farms have been planned and constructed all over the world, and the single-unit capacity of wind turbines is also increasing rapidly. At present, the megawatt-level variable-speed constant-frequency double-fed asynchronous power generation system has been widely used in wind power generation, and has become the mainstream of wind power farms around the world. The double-fed...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P9/02H02P21/06
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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