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Control method and control device of fan converter

A control method and converter technology, applied in the direction of output power conversion device, AC power input conversion to AC power output, electrical components, etc., can solve the problems of reducing the service life of power devices and increasing the voltage stress of power devices

Active Publication Date: 2018-01-05
SUNGROW POWER SUPPLY CO LTD
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AI Technical Summary

Problems solved by technology

[0003] If the DC bus voltage of the wind turbine converter is too high, it will increase the voltage stress of the power device and reduce the service life of the power device

Method used

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  • Control method and control device of fan converter
  • Control method and control device of fan converter
  • Control method and control device of fan converter

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Embodiment Construction

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0068] see figure 2 , the embodiment of the present invention discloses a control method for a wind turbine converter, including:

[0069] Step S10: Determine the larger value V of the peak value of the grid line voltage and the peak value of the stator line voltage max , as the initial given value V of the DC bus voltage dc_given0 .

[0070] Specifically, the DC bus voltage is not less than the peak value of the grid line voltage and the peak value of the...

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Abstract

The invention discloses a control method and a control device of a fan converter. The method comprises the steps of taking a larger value in a power grid line voltage peak value and a stator line voltage peak value as an initial given value Vdc_given0 of direct current bus voltage; inputting a larger value in modulation degrees of a grid side converter and a machine side converter as feedback quantity and a target modulation degree of the grid side converter as given quantity to a modulation degree closed loop regulator of the grid side converter, wherein output quantity delta U of the regulator is a given compensation value delta Vdc_given of the direct current bus voltage, and a given value Vdc_given of the direct current bus voltage is equal to Vdc_given0 plus delta Vdc_given; storing delta U in a register and then switching delta U into a given compensation value with a symbol as shown in the specification of positive-sequence sensitive reactive current when Vdc_given is greater than rated voltage Vdc_ed of a direct current support capacitor; taking 0 as an initial value of delta U; and switching delta U into delta Vdc_given and taking delta Vdc_given stored in the register asthe initial value of delta U when Vdc_given is detected as less than or equal to Vdc_ed. According to the control method and the control device, the converter can self-adaptively operate at the optimal direct current bus voltage.

Description

technical field [0001] The invention relates to the technical field of wind power generation, and more specifically, to a control method and a control device for a wind turbine converter. Background technique [0002] Megawatt-level full-power wind power generation back-to-back dual PWM (Pulse Width Modulation, pulse width modulation) converters, referred to as wind turbine converters, are used to convert the output voltage and frequency of synchronous generators into constant voltage and frequency. The alternating current is fed into the power grid, and at the same time, it can realize the low harmonics of the fed energy and the power factor can be adjusted arbitrarily. Its topology is as figure 1 As shown, it includes: the generator-side converter and the grid-side converter, where the generator-side converter and the grid-side converter share a DC bus. [0003] If the DC bus voltage of the wind turbine converter is too high, it will increase the voltage stress of the po...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M5/458
Inventor 王成悦杨春源汪令祥
Owner SUNGROW POWER SUPPLY CO LTD
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