Miniature grid-connected inverter anti-islanding method based on group control disturbance

An inverter and anti-islanding technology, which is applied in the field of anti-islanding of micro-grid-connected inverters based on group control disturbance, can solve the problem of large number of micro-grid-connected inverters, hidden dangers, limited disturbance effect of active anti-islanding technology, etc. question

Active Publication Date: 2014-12-24
云南拓日科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the problem that there are many existing micro-grid-connected inverters, there are potential safety hazards in passive anti-islanding technology alone, and the disturbance effect of active anti-islanding technology is limited. Anti-islanding method for micro grid-connected inverters based on group control disturbance based on islanding effect of grid-connected inverters

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  • Miniature grid-connected inverter anti-islanding method based on group control disturbance

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Embodiment 1

[0021] Embodiment 1: An anti-islanding method for micro-grid-connected inverters based on group control disturbances. Based on the hardware components of traditional micro-grid-connected inverters, hundreds of photovoltaic modules are connected to the busbar of the grid-connected photovoltaic power generation system. Each photovoltaic module is equipped with a micro grid-connected inverter, and each micro grid-connected inverter has the function of power carrier communication. The anti-islanding method adopts the group control synchronization technology through the following steps:

[0022] 1) Detection: Each micro-grid-connected inverter performs passive anti-islanding detection on the power grid, and detects the quality, voltage and frequency of electric energy in the power grid in real time;

[0023] 2) Disturbance: In the above step 1), when an abnormality is detected at any point on the bus and the voltage, frequency and harmonic amplitude exceed a fixed value, the micro g...

Embodiment 2

[0035] Embodiment 2: A micro-grid-connected inverter anti-islanding method based on group control disturbance, based on the hardware components of traditional micro-grid-connected inverters, hundreds of photovoltaic modules are connected to the busbar of the grid-connected photovoltaic power generation system, each Each photovoltaic module is equipped with a micro grid-connected inverter, and each micro grid-connected inverter has the function of power carrier communication. The anti-islanding method adopts the group control synchronization technology through the following steps:

[0036] 1) Detection: Each micro-grid-connected inverter performs passive anti-islanding detection on the power grid, and detects the quality, voltage and frequency of electric energy in the power grid in real time;

[0037] 2) Disturbance: In the above step 1), when an abnormality is detected at any point on the bus and the voltage, frequency and harmonic amplitude exceed a fixed value, the micro gri...

Embodiment 3

[0042] Embodiment 3: A micro-grid-connected inverter anti-islanding method based on group control disturbance. Based on the hardware components of traditional micro-grid-connected inverters, hundreds of photovoltaic modules are connected to the busbar of the grid-connected photovoltaic power generation system. Each photovoltaic module is equipped with a micro grid-connected inverter, and each micro grid-connected inverter has the function of power carrier communication. The anti-islanding method adopts the group control synchronization technology through the following steps:

[0043] 1) Detection: Each micro-grid-connected inverter performs passive anti-islanding detection on the power grid, and detects the quality, voltage and frequency of electric energy in the power grid in real time;

[0044] 2) Disturbance: In the above step 1), when an abnormality is detected at any point on the bus and the voltage, frequency and harmonic amplitude exceed a fixed value, the micro grid-con...

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Abstract

The invention relates to a grid-connected photovoltaic power generation system, in particular to a miniature grid-connected inverter anti-islanding method based on group control disturbance. The miniature grid-connected inverter anti-islanding method based on group control disturbance is characterized in that the method is based on a hardware component of the traditional miniature grid-connected inverter; a plurality of photovoltaic modules are combined to a bus of a grid-connected photovoltaic power generation system; each photovoltaic module is provided with a miniature grid-connected inverter; each miniature grid-connected inverter has a power line carrier communication function; a group control synchronizing technology is used in the anti-islanding method; and anti-islanding protection is performed after detection, disturbance and monitoring. Passive anti-islanding monitoring is taken as a main measure; active disturbance is taken as an auxiliary measure; the problem that disturbance fails due to the fact that the capacity of a single miniature grid-connected inverter is low and the power of the single miniature grid-connected inverter which independently performs disturbance anti-islanding in a power grid system is small is solved by a mode that quantitative changes cause a qualitative change; monitoring is based on the original equipment of the miniature grid-connected inverters; and other hardware is not required.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected power generation system, in particular to an anti-islanding method for a micro-grid-connected inverter based on group control disturbance. Background technique [0002] With the widespread application of photovoltaic grid-connected power generation technology, the anti-islanding technology of photovoltaic grid-connected inverters has received more and more attention. The traditional anti-islanding technology mainly monitors the photovoltaic power station system with a large single power supply capacity. The photovoltaic power station system directly connected to the power grid has a large capacity and a small number of inverter equipment. With the small capacity of the inverter equipment and a large number of distributed photovoltaic With the rapid increase in power generation, the anti-islanding technology of photovoltaic grid-connected inverters has stricter technical requirements. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 傅洪波普平贵黄超李伟明王伟
Owner 云南拓日科技有限公司
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