Fault ride-through control method of variable-frequency transformer

A fault ride-through and control method technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as failure to realize fault ride-through control of variable frequency transformers

Active Publication Date: 2020-07-31
GUANGDONG POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a variable Fault ride-through control method for frequency transformer

Method used

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  • Fault ride-through control method of variable-frequency transformer
  • Fault ride-through control method of variable-frequency transformer
  • Fault ride-through control method of variable-frequency transformer

Examples

Experimental program
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Embodiment 1

[0048] This embodiment provides a fault ride-through control method for a variable frequency transformer. The method is based on figure 1 shown in the circuit topology to achieve.

[0049] like figure 1 As shown, the circuit includes a stator side grid 1, a filter inductor 2, a parallel three-phase converter 3, a series three-phase converter 4, a control circuit, a series three-phase transformer 5, a DC capacitor 6, an H-bridge converter 7, and a rotor side grid 8;

[0050] One end of the filter inductor 2 is connected to the stator-side power grid 1, and the other end is connected to the input end of the parallel three-phase converter 3, and the output end of the parallel three-phase converter 3 is respectively connected to the input end of the series three-phase converter 4 and the H bridge. The input terminal of device 7 is connected;

[0051] The output end of the H-bridge converter 7 is connected with the DC motor (i.e. the drive motor) of the variable frequency trans...

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Abstract

The invention relates to a fault ride-through control method of a variable frequency transformer. According to the invention, by controlling the output voltage of a series three-phase converter, the method has the following effects that (1) stator harmonic voltage and stator harmonic current caused by stator side power grid harmonic voltage are suppressed, so that six-time rotor rotating electrical angular speed, six-time stator synchronous angular speed, twelve-time stator synchronous angular speed and torque and power fluctuation of the six-time stator synchronous angular speed and a six-time rotor synchronous angular speed are eliminated; and (2) the stator harmonic current caused by the rotor side power grid harmonic voltage is suppressed, so that the torque and power fluctuation of the six-time rotor synchronous angular speed are greatly reduced. According to the invention, the variable-frequency transformer is enabled to have the capability of operating under the voltage of the bilateral harmonic power grid under the condition of not adding any equipment.

Description

technical field [0001] The present invention relates to the technical field of grid asynchronous interconnection, and more specifically, to a fault ride-through control method for variable frequency transformers. Background technique [0002] The present application relates to the technical field of grid asynchronous interconnection, in particular to a method for suppressing torque and power fluctuations of variable frequency transformers under bilateral harmonic grid voltages. [0003] With the extensive use of nonlinear loads in power systems, the possibility of voltage harmonic distortion (mainly fifth and seventh harmonics) occurring in transmission lines increases gradually. The stator winding and rotor winding of the variable frequency transformer are respectively connected to two sets of transmission lines, so the voltage of the grid on both sides of the variable frequency transformer will be harmonically distorted. [0004] When the grid voltage on both sides of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/12H02J3/24H02P21/00H02P21/28H02P21/26
CPCH02J3/26H02J3/12H02J3/24H02P21/0003H02P21/28H02P21/26Y02E40/50
Inventor 卢嘉豪
Owner GUANGDONG POWER GRID CO LTD
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