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Three-phase current type unity power factor PWM grid-connected inverter control method

A unit power factor, three-phase current technology, applied in the direction of converting AC power input to DC power output, single-network parallel feeding arrangement, output power conversion device, etc., can solve the problem of high average switching rate, large switching loss, and impact Inverter conversion efficiency and other issues

Inactive Publication Date: 2017-05-10
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the common control mode of the three-phase current-type PWM grid-connected inverter, 3 of the 6 switches are kept in the PWM switching state at the same time. The loss is large, which affects the conversion efficiency of the inverter

Method used

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  • Three-phase current type unity power factor PWM grid-connected inverter control method

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Embodiment Construction

[0059] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] The main circuit topology of the three-phase current type unit power factor PWM grid-connected inverter corresponding to the control method of the three-phase current type unit power factor PWM grid-connected inverter of the present invention is specifically as follows figure 1 As shown, its circuit topology is divided into two parts: one part is the front DC / DC converter, and the other part is the three-phase current type unit power factor PWM grid-connected inverter. These two parts are the same as the commonly used circuit topology, but the control method is different. The characteristics of the control method are: ①The DC / DC converter adopts the output current closed-loop control, so that the output DC bus current Id is pulsating at 6 times the grid frequency; The pulsation valley point value is the peak point value The waveform ...

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Abstract

The invention provides a three-phase current type unity power factor PWM grid-connected inverter control method. The corresponding main circuit topology is composed of a front DC / DC converter and a commonly used current type PWM inverter, wherein the front DC / DC converter and the commonly used current type PWM inverter are connected in series and have different control modes. The control modes are characterized in that the DC / DC converter adopts closed-loop control outputting current Id for direct current, so that Id has a small ripple waveform with 6-times power frequency and is in phase synchronization with the network side voltage; the current type PWM inverter uses open-loop control without considering the PWM signal stacking time; in each PWM switch cycle, one and only one switch is under switch control, and the remaining five switches are in normal open, control breakover or normal close state respectively. According to the three-phase current type unity power factor PWM grid-connected inverter control method provided by the invention, the average switching rate is reduced, and the inverter can get higher conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of three-phase PWM inverter methods, and relates to a control method for a three-phase current type unit power factor PWM grid-connected inverter, in particular to a three-phase current type unit power factor PWM grid-connected inverter that reduces the average switching rate Inverter control method. Background technique [0002] In the common control mode of the three-phase current-type PWM grid-connected inverter, 3 of the 6 switches are kept in the PWM switching state at the same time. The loss is large, which affects the conversion efficiency of the inverter. [0003] For voltage matching with the DC power supply or other purposes, the PWM grid-connected inverter is usually equipped with a pre-DC / DC converter. For a PWM grid-connected inverter with a pre-DC / DC converter, it is necessary to use a set of control methods to effectively reduce the average switching rate, thereby reducing switching losses a...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/38H02M7/5387H02M1/0054Y02B70/10
Inventor 陈良朱磊
Owner XI'AN POLYTECHNIC UNIVERSITY