Resonance suppressing device for multi-inverter grid-connected system

A resonance suppression, multi-inverter technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, single-network parallel feeding arrangements, etc. Phenomenon suppression and other issues, to ensure safe and stable operation, improve stability margin, and suppress the system resonance phenomenon.

Inactive Publication Date: 2015-07-22
STATE GRID CORP OF CHINA +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the expansion of the grid-connected system with multiple inverters, the active damping control scheme implemented for a single inverter cannot suppress the resonance phenomenon generated by the parallel connection of multiple inverters. It is more difficult to modify the control algorithm or hardware of the built multi-inverter grid-connected system

Method used

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  • Resonance suppressing device for multi-inverter grid-connected system
  • Resonance suppressing device for multi-inverter grid-connected system
  • Resonance suppressing device for multi-inverter grid-connected system

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0017] Such as figure 1 As shown, a multi-inverter grid-connected system resonance suppression device includes a resonance information extraction device and a centralized passive resonance suppression device.

[0018] The input end of the resonance information extraction device is connected to the common point of the multi-inverter grid-connected system, the output end of the resonance information extraction device is connected to the input end of the centralized passive resonance suppression device, and the output end of the centralized passive resonance suppression device is connected to the The multi-inverter grid-connected system is connected to the common point.

[0019] The above resonan...

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Abstract

The invention discloses a resonance suppressing device for a multi-inverter grid-connected system. The resonance suppressing device for the multi-inverter grid-connected system comprises a resonance information extraction device and a centralized passive resonance suppressing device, wherein the input end of the resonance information extraction device is connected with a common point of the multi-inverter grid-connected system, the output end of the resonance information extraction device is connected with the input end of the centralized passive resonance suppressing device, and the output end of the centralized passive resonance suppressing device is connected with the common point of the multi-inverter grid-connected system. According to the resonance suppressing device for the multi-inverter grid-connected system, the damping of the multi-inverter grid-connected system is improved through the centralized passive resonance suppressing device, the purpose that the system resonance phenomenon generated in the process of grid connection of a plurality of inverters is effectively suppressed is achieved, the system stability margin is improved, and therefore the situation that the multi-inverter grid-connected system works safely and stably is guaranteed.

Description

technical field [0001] The invention relates to a resonance suppression device, in particular to a multi-inverter grid-connected system resonance suppression device. Background technique [0002] With the increasing global energy crisis and environmental problems, distributed power generation technology and micro-grid technology have received more and more attention. As the link between distributed resources and distribution network (micro-grid), inverters are used in play a key role in energy conversion. Due to the continuous expansion of the application scale of inverters, the number of parallel inverters in the same grid-connected system has gradually increased, which has seriously affected the stability of the multi-inverter grid-connected system, especially with LCL output The inverter of the filter can easily cause the resonance of the multi-inverter system. [0003] For inverters with LCL filters, in order to effectively suppress inverter resonance, an active dampin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCY02E40/40
Inventor 韦徵王彤宋飞谢磊
Owner STATE GRID CORP OF CHINA
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