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DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network

A control method and power grid technology, applied in motor generator control, electronic commutation motor control, control system, etc., can solve the problems of time delay, phase angle and amplitude errors, and increase the calculation burden of control system.

Active Publication Date: 2013-05-22
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

figure 1 In the DFIG control method shown, the calculation of the rotor current reference value and the extraction of the rotor current feedback value involve the positive and negative sequence separation of the electromagnetic components of the system. This separation process will introduce time delay and errors in phase angle and amplitude
In addition, the control system separates the positive and negative sequences of the electromagnetic quantities of the system regardless of whether the grid voltage is balanced or unbalanced, so as to obtain the reference value of the rotor current, which increases the calculation burden of the control system

Method used

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  • DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network
  • DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network
  • DFIG (doubly fed induction generator) control method based on resonant feedback in unbalanced power network

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Embodiment Construction

[0046] In order to describe the present invention more specifically, the DFIG control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0047] This implementation mode takes a commercial DFIG with a capacity of 1.5MW and a rated voltage of 690V as an example; figure 2 As shown, a DFIG control method based on resonance feedback in an unbalanced power grid includes the following steps:

[0048] (1) First, use two groups (3 in each group) of current Hall sensors 2 to collect the three-phase stator current I of DFIG respectively sa ~I sc and the three-phase rotor current I ra ~I rc , using a set of (3) voltage Hall sensors 3 to collect the three-phase stator voltage U of DFIG sa ~ U sc ;

[0049] Then, the phase-locked loop 7 is used to detect the three-phase stator voltage U sa ~ U sc The angular frequency ω of the positive sequence component 1 and phase θ 1 , using the photoelect...

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Abstract

The invention discloses a DFIG (doubly fed induction generator) control method based on resonant feedback in an unbalanced power network. By the aid of resonant feedback control technology, the DFIG control method in the unbalanced power network can be simplified, positive and negative sequence separation for the electromagnetic volume of a system and negative sequence current reference value calculation link for a rotor in any links are omitted, accordingly, the problems of time delay, phase angle and amplitude detection errors and the like caused by the positive and negative sequence separation process can be avoided, the requirements of different targets are met, and fine dynamic characteristics are realized. By the aid of the DFIG control method, reinforced operation and control of a DFIG system can be realized under the condition of the unbalanced power network, and fault ride-through capability of the DFIG system is improved. Moreover, the DFIG control method can be applied to various PWM (pulse width modulation) three-phase or single-phase inverter devices such as a solar power generation and biomass energy grid-connected inverter device and an alternating-current transmission inversion device, so that different control effects in the unbalanced power network are achieved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation control, and in particular relates to a DFIG control method based on resonance feedback in an unbalanced power grid. Background technique [0002] Energy is an important material basis for the existence and development of human society. With the continuous progress of society and rapid economic development, the demand for energy in the whole society continues to increase. However, due to problems such as energy crisis, climate warming and environmental pollution, the development and utilization of renewable energy has been widely concerned and supported by countries all over the world. Taking China as an example, by the end of 2011, China's cumulative installed capacity was 62.36GW, accounting for 26.64% of the world's total installed capacity. It is predicted that by 2015, China's installed wind power capacity will exceed 100GW, of which offshore wind power installed capacity will ...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P21/06H02P21/05H02J3/38H02P21/12
CPCY02P80/21Y02P80/20
Inventor 年珩
Owner ZHEJIANG UNIV
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