Method for controlling direct voltage of doubly-fed generator grid-side converter without phase-locked loop

A voltage control method and grid-side converter technology, applied in the direction of single-network parallel feeding arrangement, etc., can solve the problem of phase-locked loop affecting the dynamic characteristics of the control effect and so on

Active Publication Date: 2013-08-21
RENERGY ELECTRIC TIANJIN
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Problems solved by technology

[0005] 2. The control effect depends on the phase-locked loop, and the dynamic characteristics of the phase-locked loop may affect the dynamic characteristics of the control effect

Method used

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  • Method for controlling direct voltage of doubly-fed generator grid-side converter without phase-locked loop
  • Method for controlling direct voltage of doubly-fed generator grid-side converter without phase-locked loop
  • Method for controlling direct voltage of doubly-fed generator grid-side converter without phase-locked loop

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Embodiment Construction

[0035] In the existing technology, the traditional vector control technology usually adopts grid voltage orientation, virtual grid flux linkage orientation, etc., and achieves decoupling control of active components and reactive components in the dq rotating coordinate system through synchronous rotation transformation. The control of active component adopts double closed loop, the outer loop is the DC bus voltage loop, and the inner loop is the active current loop; the control of reactive component adopts single current loop, which is directly given as reactive current. The sine and cosine trigonometric functions sinθ_cosθ of the synchronous rotation angular frequency ω used for control and the angle θ used for rotation transformation are obtained through a software phase-locked loop or a hardware phase-locked loop PLL. The direct power control technology adopts a similar idea to the traditional vector control: the grid voltage orientation, the virtual grid flux linkage orient...

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Abstract

The invention provides a method for controlling direct voltage of a doubly-fed generator grid-side converter without a phase-locked loop. The method for controlling the direct voltage of the doubly-fed generator grid-side converter without the phase-locked loop comprises the following steps: the angular speed omega of synchronous rotation of network voltage is elicited and the trigonometric function sin theta-cos theta of the angle theta used for rotation transformation is elicited; a three-phase voltage equation is elicited; the input power Pg of an active component controller and the input power Qg of a reactive component controller are elicited, wherein the input power Pg and the input power Qg are sent to a power grid by the grid-side converter and the relation between grid-side converter control voltage and direct current bus voltage is deduced; the d-axis component of the control voltage and the q-axis component of the control voltage are elicited; the d-axis control voltage and the q-axis control voltage are sent to a PWM signal generating module and a PWM signal is generated and output to an IGBT unit. The method for controlling the direct voltage of the doubly-fed generator grid-side converter without the phase-locked loop has the advantages that effective control over the direct current bus voltage can be achieved through one closed loop PI controller, the dynamic response performance of a control system is improved; manufacturing cost is low, and production efficiency and stability are greatly improved.

Description

technical field [0001] The invention belongs to the field of power generation, power transformation or power distribution, and in particular relates to a direct voltage control method of a doubly-fed generator grid-side converter without a phase-locked loop. Background technique [0002] Among the existing technologies, wind power generation is developing rapidly, and various technologies are becoming more and more perfect. As one of the main components of wind turbines, doubly-fed generators use back-to-back dual PWM converters to realize variable-speed and constant-frequency power generation. Dual PWM converters include grid-side converters and machine-side converters. The control of the grid-side converter is related to the stability and safety of the DC bus voltage and the power factor injected into the grid by the grid-side converter. For the control of grid-side converters, there are currently traditional vector control technology and direct power control technology....

Claims

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Application Information

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IPC IPC(8): H02J3/40
Inventor 问虎龙王雷宋丽丽巨思旸
Owner RENERGY ELECTRIC TIANJIN
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