Multiple control device for four-quadrant rectifier

Abstract

The invention relates to the control of a four-quadrant rectifier, in particular to a multiple control device for a four-quadrant rectifier. The problem of inaccurate phase shift angle and low control precision existing in the existing multiple control of the four-quadrant rectifier is solved. The multiplexed control device of the four-quadrant rectifier, the multiplexed number is M, including M / 2 DSP chips and M / 4 FPGA chips, wherein 2 DSP chips and one FPGA chip form a hardware architecture unit, each hardware architecture Each DSP chip in the unit is used to control two four-quadrant rectifiers, that is, the first four-quadrant rectifier and the second four-quadrant rectifier. Each hardware architecture unit completes the control of four or two four-quadrant rectifiers, and one FPGA completes the four-quadrant rectifier. The rectifier controls the required data sampling. The invention does not add additional hardware circuits, and increases the precision of multiple control. The invention is especially suitable for the four-quadrant rectifier of the electric locomotive, and also suitable for other four-quadrant rectifiers.

Description

technical field [0001] The invention relates to the control of a four-quadrant rectifier, in particular to a multiple control device for a four-quadrant rectifier. Background technique [0002] Four-quadrant rectifiers are widely used in electric locomotives because of their high power factor and the ability to realize bidirectional flow of energy. Due to the low switching frequency of the four-quadrant rectifier, its AC side current has poor harmonic characteristics, which brings harmonic pollution to the power supply network, thereby affecting the power quality of the power supply network and the grid environment when other locomotives are running. [0003] In the prior art, the four-quadrant rectifier adopts multiple methods to comprehensively reduce the pollution caused by the current harmonics, and multiple control is widely used in reducing the current harmonics. [0004] One of the technical schemes of multiple control: based on the filter circuit of the control hard...

AI Technical Summary

Problems solved by technology

[0007] The switching frequency of the four-quadrant rectifier controller is low, and the delay error in the calculation of the angle when used for multiplexing is relatively large. When the angle is closed-loop for multiplexing, the accuracy of the multiplexing control is low, and the current harmonic characteristics of the AC side are poor; Or after multiple four-quadrant failures, the angles are redistributed, and all of them need to be shut down and restarted to complete the update of the new multiple angles. This update often occurs in the over-phase phase. If it is not in the over-phase phase, the new angle cannot be updated, causing the power grid Harmonics increase; if switching directly, shutdown causes fault expansion, reducing locomotive efficiency and system reliability

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