Matrix converter carrier frequency modulation method and device and storage medium

Abstract

The invention discloses a matrix converter carrier frequency modulation method and device and a storage medium. A matrix converter system comprises a network side RLC filter and a matrix converter. Converting the matrix converter system into a single-phase equivalent circuit; regarding a network side RLC filter circuit as a two-port network in a single-phase equivalent circuit, and establishing a transfer function of the two-port network; performing linearization processing on the transfer function to obtain a disturbance equation set of the two-port network near a balance working point, obtaining a feasible region of carrier frequency change, obtaining a time domain expression of grid-side current ripples of the single-phase equivalent circuit through the transfer function, and further obtaining a function relationship between an effective value of the grid-side current ripples and the carrier frequency; and giving a grid-side current ripple limit value, and analyzing the carrier frequency value of the next period according to the function relationship between the grid-side current ripple effective value and the carrier frequency to complete carrier frequency modulation. Harmonic amplitude is reduced, harmonic energy accumulation is avoided, and system electromagnetic interference can be suppressed.

Description

technical field [0001] The present invention relates to the field of matrix converters, in particular to a carrier frequency modulation method, equipment and storage medium for matrix converters. Background technique [0002] At present, the matrix converter, as an "all-silicon" type AC / AC direct power converter, has the advantages of high power density, long service life and fast dynamic response because the circuit structure does not contain large-capacity inductive or capacitive energy storage elements. And the advantages of bidirectional flow of energy, etc., have attracted widespread attention. The traditional structure of the matrix converter in the system is called a direct matrix converter, which consists of a 3×3 bidirectional switch array. Using the double space vector method, the modulation process of the direct matrix converter can be regarded as a current source rectifier (Current Source Rectifier). , CSR) characteristic virtual rectifier stage and a virtual in...

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Problems solved by technology

However, since the DC current of the matrix converter is constantly changing, the analytical calculation of the input and output ripple is more complicated; at the same time, the parameters of the grid-side filter have strict requirements on the switching frequency range, so compared with two-level inverters, etc. It is more difficult to implement the variable switching frequency strategy on the matrix converter for inverters powered by high-voltage DC power supplies

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