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Doubly fed induction generator internal frequency synchronization method and device based on power balance

A doubly-fed induction and internal frequency technology, which is used in the control of generators, wind power generation, and single-grid parallel feeding arrangements through magnetic field changes to achieve the effects of enhancing grid stability, improving short-circuit capacity, and increasing system inertia.

Active Publication Date: 2013-08-21
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0010] Aiming at the deficiencies of the prior art, the present invention provides a method for internal frequency synchronization control of doubly-fed induction generators based on power balance, aiming at solving the above-mentioned problems caused by current vector control based on phase-locked synchronization in the prior art

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  • Doubly fed induction generator internal frequency synchronization method and device based on power balance
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  • Doubly fed induction generator internal frequency synchronization method and device based on power balance

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The present invention aims to solve the problem that in the prior art, due to the current vector control based on phase-locked synchronization, the doubly-fed asynchronous generator system does not have an internal frequency, so that it cannot provide a certain voltage support for the power grid and cannot operate independently from the power grid (island operation) , black start, etc.) and other defects, as well as stability problems caused by phase-locked loops under weak power grids. An internal frequency synchronization control method based on power balance is proposed. The so-called int...

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Abstract

The invention discloses a doubly fed induction generator internal frequency synchronization method and device based on power balance. The method comprises the steps that the internal synchronization mechanism of a synchronous generator is referred, and slip angular frequency of the rotor side exciting voltage is directly generated by adjusting active power deviation, and phases are obtained through integration processing; an excitation system of the synchronous generator is referred, amplitude of the rotor side exciting voltage is directly generated by adjusting reactive power deviation or terminal voltage deviation, a rotor side exciting voltage vector is obtained through the obtained phases and the amplitude, and internal frequency synchronization control of a doubly fed induction generator is achieved. By means of the doubly fed induction generator internal frequency synchronization method and device based on the power balance, the doubly fed induction generator can possess internal frequency which outward represents as a voltage source with the amplitude and frequency being controlled, high voltage support is provided for a power grid, capacity of short circuit of the power grid is improved, and stability of the power grid is improved. By the adoption of the internal frequency synchronization control, the doubly fed induction generator can operate without depending on intensity of the power grid, a possibility of independent operating of the doubly fed induction generator is provided, and a certain guarantee is provided for safe operating of a power system.

Description

technical field [0001] The invention belongs to the field of motor control and power system power generation, and more specifically relates to a method and device for internal frequency synchronization control of a doubly-fed induction generator based on power balance. Background technique [0002] The power generation unit in the traditional power system is basically composed of a conventional synchronous power supply, that is, a synchronous generator. The conventional synchronous power supply is a voltage source with controlled amplitude and frequency, which can provide strong voltage support for the power grid, especially the weak power grid, improve the short-circuit capacity of the power grid, and enhance the stability of the power grid; and provide inertia for the power grid to enhance frequency stability; at the same time The conventional synchronous power supply can operate independently, providing certain guarantees for the security defense of the power grid, such a...

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Application Information

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IPC IPC(8): H02P9/14H02J3/40
CPCY02E10/76
Inventor 袁小明王硕胡家兵
Owner HUAZHONG UNIV OF SCI & TECH
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