Switching virtual circuit (SVC) feedforward feedback controlling method based on high-power four-quadrant converter load

A four-quadrant converter, feed-forward feedback technology, applied in reactive power adjustment/elimination/compensation, flexible AC transmission systems, etc., can solve problems such as unfavorable software implementation, not widely used, complex algorithms, etc. Bus voltage, impact suppression, and the effect of reducing the amount of computation

Active Publication Date: 2013-06-05
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
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Problems solved by technology

The method based on the instantaneous reactive power theory can calculate reactive power in real time and has a fast response, but the detection accuracy of the p-q method is affected by the grid voltage waveform. When the grid voltage has a certain distortion, the detection result will hav...

Method used

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  • Switching virtual circuit (SVC) feedforward feedback controlling method based on high-power four-quadrant converter load
  • Switching virtual circuit (SVC) feedforward feedback controlling method based on high-power four-quadrant converter load
  • Switching virtual circuit (SVC) feedforward feedback controlling method based on high-power four-quadrant converter load

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Embodiment

[0051] Such as figure 2 As shown, the high-power four-quadrant converter 1 mentioned in the present invention is mainly used in fields such as a magnet power supply system of a tokamak device, and a DC drive. In this embodiment, the magnet power supply of the tokamak device is used as the load of the converter 1, and the transformer is a three-winding transformer, and the difference between the two secondary windings is 180° in electrical angle. The forward converter is composed of two three-phase fully-controlled rectifier bridges TC1 and TC2, and the reverse converter is composed of two three-phase fully-controlled rectifier bridges TC3 and TC4. When the absolute value of the main circuit current is greater than 15% of the rated current, TC1 and TC2 are connected in parallel to pass forward current. TC3 and TC4 are connected in parallel to pass the reverse current, and the positive and negative bridges are not triggered at the same time; when the absolute value of the main...

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Abstract

The invention discloses a switching virtual circuit (SVC) feedforward feedback controlling method based on a high-power four-quadrant converter load. The SVC feedforward feedback controlling method based on the high-power four-quadrant converter load comprises steps as below: analyzing wire-connection and operation mode of a converter; building a reflecting internal memory network; calculating reactive power of the converter; collecting branch circuit state of a filter; importing network voltage feedback; achieving firing angle controlling; the SVC feedforward feedback controlling method quickly and accurately calculates reactive power the converter needing to waste soon to be used as a feedforward amount for load compensation according to the high-power converter load operation mode and real time data, meets requirements of load compensation quickness, at the same time gives consideration to indexes of electric power system compensation stability, enables reactive power compensation response time to be shorter than 4ms, effectively restrains impaction of reactive power to the electric power, eliminates occurrence of voltage flicker, and further improves stability of the electric power system.

Description

technical field [0001] The invention relates to a SVC feedforward feedback control method, in particular to an SVC feedforward feedback control method based on a high-power four-quadrant converter load. Background technique [0002] With the development of power electronic devices, new devices composed of power electronic devices are developing in the direction of miniaturization and high frequency. However, in high-power power electronics applications, due to the characteristics of high voltage and large current, thyristor devices still occupy a major position. High-power four-quadrant thyristor converters can realize forward rectification, forward inversion, reverse rectification, and reverse inversion, and are widely used in Tokamak magnet power supply systems, DC drives and other fields. The four-quadrant operation of the converter has great volatility and randomness, which has a great impact on the grid voltage during operation, consumes a large amount of reactive powe...

Claims

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Application Information

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IPC IPC(8): H02J3/18
CPCY02E40/12Y02E40/10
Inventor 吴亚楠许留伟束畅茆华风李俊
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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