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Pulse width modulation (PWM) control method for single-phase grid-connected inverter

A technology of pulse width modulation and control method, applied in the field of power generation, can solve the problems of high switching loss, low system efficiency, low switching frequency, etc., and achieve the effects of increasing switching frequency, improving system efficiency, and improving service life

Inactive Publication Date: 2009-12-16
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a pulse width modulation PWM control method for single-phase grid-connected inverters, which overcomes the problems of low switching frequency, high switching loss and low system efficiency in the prior art

Method used

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  • Pulse width modulation (PWM) control method for single-phase grid-connected inverter
  • Pulse width modulation (PWM) control method for single-phase grid-connected inverter
  • Pulse width modulation (PWM) control method for single-phase grid-connected inverter

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] figure 1 It is a schematic diagram of an existing single-phase grid-connected power generation circuit, which is the hardware circuit basis of the present invention. The power electronic device converts electricity generated by solar energy, wind energy, etc. into DC voltage 5 . The positive pole of the DC voltage 5 is connected to one end of the power switch tube S1 and the power switch tube S3 respectively, and the negative pole of the DC voltage 5 is connected to one end of the power switch tube S2 and the power switch tube S4 respectively, and the power switch tube S1 and the power switch tube S2 are composed of One bridge arm, the power switch tube S3 and the power switch tube S4 form another bridge arm; the connection point A of the power switch tube S1 and the power switch tube S2 is a bridge arm output, and the connection point...

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Abstract

The invention discloses a pulse width modulation (PWM) control method for a single-phase grid-connected inverter, which is implemented according to the steps of: calculating to obtain single-polarity PWM wave; comparing network voltage detection with a zero crossing comparator to obtain a synchronous square wave signal, and then performing two divided-frequency on the synchronous square wave signal to obtain a synchronous square wave two divided-frequency signal; keeping only one of four power switch tubes of a single-phase full-bridge inverter in a high-frequency PWM action state, the power switch tube, which is on the diagonal of the power switch tube, of another bridge arm in a power frequency action state, and the other two power switch tubes in a shutoff state; making the four power switch tubes alternately act in a high-frequency PWM mode according to certain phase sequence; and adopting a principle that the power switch tube which conducts shuts off in advance to add dead zone time only during the zero crossing of network voltage at the same time. The method is applicable to single-phase grid-connected power generation systems, and has the characteristics of reducing the loss of switches, eliminating dead zone effect and optimizing heat dissipation.

Description

technical field [0001] The invention belongs to the technical field of power generation, and relates to grid-connected power generation equipment for distributed renewable new energy such as solar energy and wind energy, and in particular to a pulse width modulation PWM control method for a single-phase grid-connected inverter. Background technique [0002] With the continuous reduction of fossil energy and the severe situation of global warming, renewable natural energy such as solar energy and wind energy, which are green, environmentally friendly and extremely abundant, are becoming more and more popular. These renewable new energies can be easily converted into electrical energy through appropriate media (such as solar cells, wind generators, etc.), and then use power electronic devices to convert the electrical energy into direct current, and finally transmit the above electrical energy to DC through grid-connected inverters. single-phase grid. [0003] Single-phase gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02J3/38
Inventor 孙向东任碧莹张琦王建渊杨惠
Owner XIAN UNIV OF TECH
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