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Control method for dual-bucking full-bridge grid-connected inverter

A control method and double step-down technology, which are applied in the parallel feeding arrangement of a single network, the conversion device of output power, the conversion of AC power input into DC power output, etc., which can solve the zero-crossing distortion, increase the volume and weight of the filter, etc. problems, to achieve the effect of reducing cost, reducing volume and weight, and improving conversion efficiency

Inactive Publication Date: 2011-10-19
YANCHENG INST OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the grid-connected inverter adopts bipolar modulation, which increases the size and weight of the filter compared with unipolar
However, the traditional unipolar modulation method has the problem of zero-crossing distortion.

Method used

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  • Control method for dual-bucking full-bridge grid-connected inverter
  • Control method for dual-bucking full-bridge grid-connected inverter
  • Control method for dual-bucking full-bridge grid-connected inverter

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Embodiment Construction

[0016] like figure 1 shown. A control method for a double-buck full-bridge grid-connected inverter, including a power grid u grid ,power supply U in , the first filter inductor L 1 , the first power switch tube S 1 , the first freewheeling diode D 1 , the second filter inductor L 2 , the second power switch tube S 2 , the second freewheeling diode D 2 , the third filter inductor L 3 , the third power switch tube S 3 , the third freewheeling diode D 3 , the fourth filter inductor L 4 , the fourth power switch tube S 4 and the fourth freewheeling diode D 4 , where the power U in The anode of the first power switch S 1 Drain of the second freewheeling diode D 2 The cathode of the third power switch tube S 3 drain and fourth freewheeling diode D 4 The cathode connection of the first power switch tube S 1 The sources are respectively connected to the first freewheeling diode D 1 The cathode and the first filter inductor L 1 connected to the input, the fi...

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Abstract

The invention discloses a control method for a dual-bucking full-bridge grid-connected inverter, belonging to an inverter control method. In the invention, the grid current of the grid-connected inverter is sampled by a current sensor; the network voltage is sampled by a voltage sensor; the grid current given having the same frequency and the same phase with the network voltage is output by a phase locking ring; a grid current ring receives the grid current given and the grid current feedback signal and outputs the voltage given 1. A PWM (pulse-width modulation) generating circuit receives the voltage given 1 and outputs logic control signals PWM1 and PWM2. A power switch tube drives the logic circuit to receive the logic control signals PWM1 and the PWM 2 as well as the network voltage feedback signal, and outputs the high and low level driving signals of all power switch tubes. In the invention, single-polarity frequency-doubling control is realized, the volume and the weight of a filter are reduced, the problem of zero crossing point distortion occurring to the traditional single-polarity modulation network current does not exist, only two power switch tube high-frequency switches are used in every half working frequency period, and the conversion efficiency is improved.

Description

technical field [0001] The invention relates to a control method of an inverter, in particular to a control method of a double step-down full bridge grid-connected inverter. Background technique [0002] With the continuous shortage of fossil energy and the increasing environmental pollution, renewable energy such as solar energy and fuel cells have attracted more and more attention in distributed power generation systems due to their clean, safe, pollution-free, and renewable characteristics. However, the output of solar cells and fuel cells is direct current, while the grid voltage is alternating current. Therefore, grid-connected inverters have become an important part of distributed power generation systems. In order to ensure the normal operation of the grid, grid-connected inverters are required to have high reliability. However, the traditional bridge-type grid-connected inverter has the problem of bridge arm cut-through. Therefore, in order to ensure that the power ...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02J3/38
Inventor 姚志垒胡国文顾春雷薛迎成
Owner YANCHENG INST OF TECH
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