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Three-level inverter modulation mode switching method and device, equipment and storage medium

A three-level inverter, modulation technology, applied in output power conversion devices, high-efficiency power electronic conversion, conversion of AC power input to DC power output, etc., can solve the sudden change of duty cycle, common mode voltage, common Mode current sudden change, inability to meet the requirements of new energy grid connection, etc., to reduce the common mode voltage amplitude and overcome the complex effect

Active Publication Date: 2022-06-03
SHANGHAI CHINT POWER SYST
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Problems solved by technology

[0006] The present application provides a method, device, device and storage medium for switching the modulation mode of a three-level inverter, aiming to solve the problem of sudden change in duty ratio during the switching process of the existing three-level inverter modulation mode, resulting in output voltage, The high-frequency oscillation of the current, the sudden change of the common-mode voltage and the common-mode current, cannot meet the technical problems of new energy grid-connected requirements

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  • Three-level inverter modulation mode switching method and device, equipment and storage medium

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[0072] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of this application.

[0073] In the description of this application, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of this application, "plurality" means two or mo...

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Abstract

The invention provides a three-level inverter modulation mode switching method and device, equipment and a storage medium. The method comprises the following steps: acquiring a three-phase sinusoidal modulation wave; determining a first zero-sequence voltage component according to the three-phase voltage of the three-phase sinusoidal modulation wave, and superposing the three-phase sinusoidal modulation wave with the first zero-sequence voltage component to obtain a three-phase saddle-type modulation wave; determining a second zero-sequence voltage component according to the three-phase voltage of the three-phase saddle-type modulation wave, superposing the three-phase saddle-type modulation wave with the second zero-sequence voltage component, and performing adjustment according to a preset zero-sequence voltage adjustment factor to obtain a hybrid modulation smooth switching modulation wave; comparing the hybrid modulation smooth switching modulation wave with a preset triangular wave stacked in an inverted manner to generate a pulse width modulation signal; according to the invention, smooth switching of continuous and intermittent modulation modes is realized, the common-mode voltage and the common-mode current change stably in the switching process, and the new energy grid connection requirement is met.

Description

technical field [0001] The present application relates to the technical field of three-level inverter modulation, in particular to a three-level inverter modulation mode switching method, device, device and storage medium. Background technique [0002] Three-level inverters include diode neutral point clamp type, active neutral point clamp type, T type, flying capacitor type, etc. Among them, the main circuit topology of the three-level active neutral point clamp inverter is as follows: figure 1 shown. Compared with two-level converters, three-level inverters have the advantages of high bus voltage level, good output power quality, large output power, low device voltage stress and compatibility with existing power devices. The system has been widely used and is the future development direction of new energy grid-connected power generation inverters. [0003] The current commonly used modulation methods include continuous modulation and discontinuous modulation (DPWM). Diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387H02J3/38
CPCH02M7/483H02M7/5387H02J3/38Y02B70/10
Inventor 杨博周旭殷晔平张玉林朱国忠李乃湖
Owner SHANGHAI CHINT POWER SYST
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