Third harmonic current tracking method in H3IMC

Abstract

The invention discloses a third harmonic current tracking method in H3IMC. According to the method disclosed by the invention, PI closed-loop controlling is carried out by collecting an actual value of a harmonic current injected into an input side, thereby realizing harmonic current tracking of a set reference value. Compared with the traditional control method, the current tracking performance is improved on the premise that the hardware device is not increased. The output value of the PI controller is designed to be a harmonic current based on the H3IMC topology; difference processing is carried out on the harmonic current value and a current periodic harmonic current feedback value to obtain a current increment; and then a duty cycle of a switching tube in a harmonic injection bridge arm is calculated, so that harmonic current tracking is realized precisely and the good input current performance is obtained. A current out-of-control problem that is caused when the traditional control method is applied to the H3IMC topology is solved. tracking of the reference value by the harmonic current is realized; the input current performance is improved effectively; and the safe and stable operation of the system is ensured.

Description

technical field [0001] The invention relates to a current control method, in particular to a third harmonic current tracking method in H3IMC, and belongs to the technical field of matrix converter control. Background technique [0002] In a high-power power system, the three-phase alternating current output by the power supply usually undergoes two-stage conversion (AC-DC-AC or AC-DC-DC) to obtain the required voltage and then provides power to the load end. The two-stage matrix converter (TSMC ) is a new type of "green" active front-end AC-DC-AC converter, and because it has many advantages such as energy storage elements without a DC link, energy can flow in both directions, sinusoidal input and output performance, and power factor controllable , has increasingly attracted the attention of scholars at home and abroad. [0003] Although the research on TSMC has become more and more in-depth in recent years, there are still some insurmountable problems: (1) Since there is n...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a third harmonic current tracking method in H3IMC, which aims at the problem that the traditional PI closed-loop control cannot be effectively applied to the H3IMC circuit, and makes up for the vacancy of the bridge arm injection circuit control method in the H3IMC circuit , to achieve the third harmonic current tracking reference value

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