Torque and power fluctuation suppression method of variable frequency transformer

A technology of power fluctuation suppression and transformers, applied in the direction of single AC network with different frequencies, motor control, motor generator control, etc., can solve the problems of unbalanced fault ride-through control, failure to achieve bilateral, etc.

Active Publication Date: 2020-05-19
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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Problems solved by technology

[0005] The present invention provides a method for suppressing torque and power fluctuations of variable frequency transformers in order to overcome the defects in the above-mentioned prior art that the fault ride-through control of variable frequency transformers cannot be realized under the condition of bilateral unbalance and harmonic grid voltage

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  • Torque and power fluctuation suppression method of variable frequency transformer
  • Torque and power fluctuation suppression method of variable frequency transformer
  • Torque and power fluctuation suppression method of variable frequency transformer

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Embodiment 1

[0055] This embodiment provides a method for suppressing torque and power fluctuations of variable frequency transformers. The method described in this embodiment is applied to figure 1 The variable frequency transformer fault ride-through circuit shown.

[0056] The circuit includes a stator-side power 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 power grid 8 ;

[0057] 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;

[0058] The output terminal of the H-bridge converter 7 is connected with ...

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Abstract

The invention relates to a torque and power fluctuation suppression method of a variable-frequency transformer. The method comprises the steps of S1, collecting related signals; S2, processing the related signals to obtain a stator side power grid positive sequence voltage direct current component, a stator voltage direct current component and a current direct current component; S3, processing according to a preset voltage control equation to obtain direct-current components of all voltage reference values of a series three-phase converter; S4, carrying out coordinate transformation processingto obtain voltage reference values of the series three-phase converter, and adding the voltage reference values of the series three-phase converter to obtainthe voltage reference value of the seriesthree-phase converter in a two-phase static coordinate system; and S5, carrying out space vector modulation on the voltage reference value of the series three-phase converter to obtain a control signal of a switch of the series three-phase converter, and inputting the control signal into a controller to realize suppression of a torque and a power fluctuation of the variablefrequency transformer. In the invention, the variable frequency transformer has a capability of operating under bilateral imbalance and a harmonic power grid voltage.

Description

technical field [0001] The invention relates to the technical field of grid asynchronous interconnection, and more specifically, to a method for suppressing torque and power fluctuations of variable frequency transformers. Background technique [0002] With the extensive use of unbalanced and nonlinear loads in power systems, the possibility of voltage unbalance and harmonic distortion co-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 grid voltage on both sides of the variable frequency transformer will be unbalanced and harmonically distorted at the same time. [0003] When the grid voltage on both sides of the variable frequency transformer is unbalanced and harmonically distorted, the current flowing through the variable frequency transformer will be unbalanced and harmonically distorted. The interaction between the unbalan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24H02J3/26H02J3/02H02J3/01H02P21/14H02P21/20H02P29/50
CPCH02J3/01H02J3/02H02J3/24H02J3/26H02P21/14H02P21/20H02P29/50Y02E40/40Y02E40/50
Inventor 卢嘉豪
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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