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Three-phase PWM rectifier control method using isolation transformer for grid connection

A technology of isolation transformer and control method, which is applied in the direction of converting AC power input to DC power output, output power conversion device, conversion equipment that can be converted to DC without intermediate conversion, etc.

Pending Publication Date: 2021-01-29
苏州弗赛新能源科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above technical problems, the object of the present invention is to provide a three-phase PWM rectifier control method using an isolation transformer grid-connected, which can solve the problem of accurate control of the grid-connected current amplitude and phase of the rectifier when the AC side only uses an isolation transformer to connect to the grid , without adding hardware, the common three-phase PWM rectifier connected to the grid using an AC filter inductor can also be connected to the grid using an isolation transformer

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  • Three-phase PWM rectifier control method using isolation transformer for grid connection
  • Three-phase PWM rectifier control method using isolation transformer for grid connection

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Embodiment Construction

[0043] In order to describe the technical content, structural features, goals and effects of the present invention in detail, the following examples are given to describe the embodiments in conjunction with the accompanying drawings.

[0044] In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the invention.

[0045] The invention provides a control method for a...

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Abstract

The invention provides a three-phase PWM rectifier control method using an isolation transformer for grid connection. The three-phase PWM rectifier control method comprises the steps of isolation transformer parameter identification, alternating current grid connection phase angle, amplitude acquisition and PWM signal control. According to the invention, the problem of the accurate control of theamplitude and phase of the grid-connected current of a rectifier when only an isolation transformer is used to connect a power grid at the alternating current side can be solved, and the common three-phase PWM rectifier using an alternating current filter inductor for grid connection can also use the isolation transformer for grid connection under the condition of not increasing hardware.

Description

technical field [0001] The invention relates to the field of control methods for grid-connected equipment of power electronics, in particular to a control method for a three-phase PWM rectifier connected to the grid using an isolation transformer. Background technique [0002] The three-phase PWM rectifier can rectify the three-phase AC, so as to obtain a stable DC bus voltage for the subsequent circuit. It uses a full-control device to control the on-off of the circuit, and has the characteristics of good sinusoidal input current, high unit power factor, bidirectional flow of energy, and adjustable DC bus voltage after rectification. [0003] In equipment such as AC-DC-AC inverters and AC-DC-DC power supplies, a three-phase PWM rectifier is often used as the front stage to provide the DC bus voltage for the latter stage. [0004] The output terminal of the power grid side of the three-phase PWM rectifier needs to use AC filter inductors to filter the output current, thereb...

Claims

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Application Information

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IPC IPC(8): H02M7/219H02M5/10
CPCH02M7/219H02M5/10
Inventor 房振东唐剑波李保健朱德翔
Owner 苏州弗赛新能源科技有限公司
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