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

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...

AI Technical Summary

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 have errors. Contains two space coordinate transformations, the algorithm is more complicated, which is not conducive to software implementation

The disadvantage of the FBD algorithm is that it is mostly limited to theoretical research and has not been widely used, especially in engineering practice.

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