Voltage control type virtual synchronizing method of double-feed wind power generator set

A doubly-fed wind power generation and doubly-fed generator technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as low inertia, weak damping and line impedance

Active Publication Date: 2018-10-19
HEFEI UNIV OF TECH
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Problems solved by technology

[0011] Based on the existing research, the present invention focuses on the low inertia, weak damping and line impedance characteristics of the weak grid and its influence on the performance of the doubly-fed wind turbine inte...

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  • Voltage control type virtual synchronizing method of double-feed wind power generator set
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  • Voltage control type virtual synchronizing method of double-feed wind power generator set

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Embodiment Construction

[0059] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0060] Such as figure 1 and image 3 As shown, in this embodiment, the virtual synchronous control structure of the doubly-fed wind turbine based on the virtual impedance of the stator, the control objects contained in it: figure 1 Rotor side converter, stator voltage proportional-integral regulator, rotor current proportional-integral regulator, space vector pulse width modulation (SVPWM) module, rotor winding current Hall element, photoelectric speed encoder, stator terminal voltage Hall element, stator current Hall element, doubly-fed generator output power calculation, low-pass filter, virtual synchronization algorithm, stator virtual impedance adaptation and voltage feed-forward compensation, and image 3 The grid-side converter and DC-side energy storage structure are shown.

[0061] It should be noted that the control...

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Abstract

The invention discloses a voltage control type virtual synchronizing method of a double-feed wind power generator set. Through simulating inertia and a frequency-modulating and voltage-modulating characteristic of a synchronizer, the set can be different from a characteristic of no electric grid frequency change response in a traditional current control type, thereby possessing capability of supporting voltage and frequency of a weak power grid based on the voltage control type through virtual inertia. The method provides and realizes a VCT-DFIC virtual synchronous control structure of which an inner ring is controlled by an improved double-feed generator stator voltage rotor current double-closed-loop structure based on adaptive stator virtual impedance and transmission line sag voltage feedforward compensation in a control manner which includes crossed control between stator voltage and rotor current and furthermore an outer ring is controlled by a virtual synchronous realizing algorithm. The method realizes output power control in VCT-DFIG grid integration operation in a weak grid condition with any actual impedance and effective decoupling, and furthermore a designed control structure realizes higher inertia and frequency supporting capability of the double-feed generator.

Description

technical field [0001] The present invention focuses on the technical field of new energy power generation and researches a doubly-fed generator control method, relates to a voltage-controlled strategy for parallel operation with a weak grid, and in particular relates to a voltage-controlled virtual synchronization method for a doubly-fed wind power generating set. Background technique [0002] With the continuous development of grid-connected operation of renewable energy, the application of new energy with high penetration rate and large capacity makes the power grid present the characteristics of low inertia and weak damping. In addition, energy utilization based on distributed forms and long-distance transmission lines also cause The non-negligible line impedance, so when distributed new energy such as photovoltaic and wind power is generated and the weak grid is running, there are a series of "weak" (low inertia, weak damping, high line impedance and low short-circuit ca...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/42H02J3/38
CPCH02J3/24H02J3/386H02J3/42Y02A30/60Y02E10/76
Inventor 谢震靳晓雯张兴孟浩杨淑英
Owner HEFEI UNIV OF TECH
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