Islanding detection method, device, converter and distributed power generation system

An island detection and islanding technology, applied in the direction of measuring devices, measuring current/voltage, measuring electricity, etc., can solve the problems of misjudgment, voltage peak increase at the common connection point, etc., and achieve the effect of avoiding interference and high accuracy

Active Publication Date: 2017-02-15
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there is such a problem in the above method, that is, when there are integer harmonics in the voltage at the common connection point, the harmonic voltage will increase the peak value of the voltage at the common connection point, thereby causing misjudgment

Method used

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  • Islanding detection method, device, converter and distributed power generation system
  • Islanding detection method, device, converter and distributed power generation system
  • Islanding detection method, device, converter and distributed power generation system

Examples

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Embodiment 1

[0072] Corresponding to the above embodiments, this application also provides an embodiment of an island detection device, please refer to Figure 5 , Embodiment 1 of the islanding detection device provided by the present application, the islanding detection device includes:

[0073] The first voltage obtaining unit 101 is used to obtain the voltage fundamental wave vector component values ​​Vd and Vq at the common connection point;

[0074] The second voltage acquisition unit 102 is used to calculate the voltage fundamental wave amplitude V at the common connection point according to the voltage fundamental wave vector component values ​​Vd and Vq at the common connection point acquired by the first voltage acquisition unit;

[0075] A voltage judging unit 104, the voltage judging unit is used for judging that islanding occurs when the voltage fundamental wave amplitude V at the common connection point exceeds a set voltage range.

[0076] Further, the islanding detection de...

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Abstract

The invention discloses an island detection method. The island detection method includes: performing clark and park transformation on an instantaneous value of voltage at a point of common coupling to obtain components Vdx and Vqx under a rotary dq coordinate system, subjecting the Vdx and Vqx to period averaging to obtain component values Vd and Vq of voltage fundamental wave vectors at the point of common coupling, and finally acquiring voltage fundamental wave amplitude V at the point of common coupling. By utilizing the voltage fundamental wave amplitude at the point of public coupling as a criterion, harmonic components in the voltage at the point of common coupling are eliminated, interference caused by integer harmonics of the voltage at the point of common coupling to judgment of island effect is avoided, and accordingly occurrence of the island effect can be judged rapidly and accurately. Occurrence of the island effect can be judged if any one of the voltage and frequency is beyond a set range, and accuracy is higher. The invention further discloses an island detection device, a grid-connected converter and a distributed power generation system.

Description

technical field [0001] The present application relates to the technical field of grid-connected power generation, and in particular to an islanding detection method, device, converter and distributed power generation system. Background technique [0002] Please refer to figure 1 In the schematic diagram given, the existing three-phase power supply system includes a grid-connected converter 240 , an input source 250 that provides electric energy for the grid-connected converter 240 , and a A grid-connected switch 210 , a common connection point 220 located between the grid-connected converter 240 and the grid-connected switch 210 , and a load 230 connected to the common connection point 220 . The load 230 includes not only actual energy consumption loads, but also other grid-connected converters or other grid-connected power generation equipment (not shown in the figure). When the grid interrupts the power supply due to failure or other reasons, the grid-connected switch 21...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G01R19/165
Inventor 胡超赵为
Owner SUNGROW POWER SUPPLY CO LTD
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