Method and device for suppressing resonance of grid-connected inverter

A resonance suppression and inverter technology, which is applied in the direction of converting irreversible DC power input to AC power output, can solve the problems of reducing system efficiency, unable to ensure reliable suppression of resonance of grid-connected inverters, and additional loss of damping resistance.

Active Publication Date: 2014-12-10
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a method and device for suppressing the resonance of the grid-connected inverter, which solves the problem that the existing passive damping method cannot guarantee the reliable suppression of the resonance of the grid-connected inverter, and the increased damping resistance will cause additional Technical issues that reduce system efficiency due to losses

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  • Method and device for suppressing resonance of grid-connected inverter
  • Method and device for suppressing resonance of grid-connected inverter
  • Method and device for suppressing resonance of grid-connected inverter

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Embodiment 1

[0064] Such as figure 1 As shown, it is a flow chart of a method for suppressing resonance of a grid-connected inverter according to the present invention, and the method may specifically include:

[0065] Step S110: Monitor in real time whether the grid-connected inverter has resonance, if yes, execute step S120, if not, continue to execute step S110.

[0066] Since the existing grid-connected inverter resonance suppression method is realized by connecting the damping resistor in series with the filter capacitor, no matter whether the grid-connected inverter resonates or not, the damping resistor that has been participating in the work will increase the heat generation of the system equipment, etc. The extra loss reduces the system efficiency, thus restricting its application.

[0067] Based on this, in the embodiment of the present invention, during the working process of the grid-connected power generation system, it is monitored in real time whether the grid-connected inv...

Embodiment 2

[0075] Such as figure 2 As shown, it is a flow chart of another method for suppressing resonance of a grid-connected inverter according to the present invention. The method may specifically include:

[0076] Step S201: Obtain the AC sampling voltage at the high voltage side of the grid-connected voltage.

[0077] Among them, the embodiment of the present invention can use the sampling conditioning circuit to obtain the AC voltage signal U from the voltage transformer on the high voltage side of the grid-connected voltage i , after sampling, conditioning and other processing, the obtained AC sampling voltage U x sent to the processing circuit.

[0078] In this embodiment, the AC voltage signal U i Specifically, it can be any one of the A / B / C phase or AB / BC / CA phase of the three-phase power grid. After that, the voltage sampling can be performed by using LEM sensors or resistor voltage dividers, and then the sampling voltage can be filtered by the conditioning circuit. , am...

Embodiment 3

[0122] Such as image 3 As shown, it is a schematic structural diagram of a grid-connected inverter resonance suppression device according to the present invention, and the device may specifically include:

[0123] The monitoring module 310 is used to monitor in real time whether resonance occurs in the grid-connected inverter.

[0124] Among them, in the embodiment of the present invention, such as Figure 4 As shown, the monitoring module 310 may specifically include:

[0125] The acquiring unit 311 is configured to acquire the AC sampling voltage at the high voltage side of the grid-connected voltage.

[0126] In the embodiment of the present invention, the AC voltage collected by the voltage transformer on the high-voltage side of the grid-connected voltage can be received by the sampling conditioning circuit first, and the AC voltage can be filtered, amplified or reduced, and output level processed, etc., and finally the conditioned The signal is sent to the AD convers...

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Abstract

The invention provides a method and a device for suppressing resonance of a grid-connected inverter. The method includes monitoring the grid-connected inverter in real time, judging whether the grid-connected inverter is in resonance, if so, then starting a resonance amplitude control loop, calling a preset resonance suppression regulation algorithm according to preset priority, and regulating parameter of the grid-connected inverter to eliminate the resonance thereof. Accordingly, resonance of the grid-connected inverter is detected and handled as early as possible, reliability in suppression of the resonance of the grid-connected inverter is guaranteed, and further, adverse influence to grid-connected power generation caused by resonance of the grid-connected inverter is avoided.

Description

technical field [0001] The invention relates to the technical field of grid-connected inverters in new energy sources, and more specifically, to a method and device for suppressing resonance of grid-connected inverters. Background technique [0002] In the development of new energy, with the grid-connected power generation of new energy such as solar cells, wind power and fuel cells becoming more and more popular, grid-connected inverter power generation technology has become an important research direction. In order to eliminate the high-order harmonics in the output current of the grid-connected inverter, at present, the output of the existing grid-connected inverter usually uses an LCL filter to process the harmonics, but the LCL filter is an undamped third-order system, and its There is a resonance point in itself, and if the design of the grid-connected power generation control system is unreasonable, it will easily cause resonance; moreover, with the increase of instal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42
Inventor 潘年安程林陶磊
Owner SUNGROW POWER SUPPLY CO LTD
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