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A multi-distributed power island detection method based on inverter frequency control

A distributed power source and frequency control technology, which is applied to electric power measurement, photovoltaic power generation, electrical components, etc. through current/voltage. , to avoid the effect of dilution effect

Active Publication Date: 2022-06-03
SHANDONG UNIV OF TECH
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Problems solved by technology

[0004] However, in the prior art, for the island detection of multiple distributed power sources, the dilution effect of multiple distributed power sources is prone to occur during the detection process, resulting in a large detection blind area
Therefore, in the detection of multiple distributed power islands, it is an urgent problem to be solved in this field to design a technical solution that can eliminate the dilution effect and avoid large detection blind spots.

Method used

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  • A multi-distributed power island detection method based on inverter frequency control
  • A multi-distributed power island detection method based on inverter frequency control
  • A multi-distributed power island detection method based on inverter frequency control

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Embodiment Construction

[0031] Figures 1 to 2 are preferred embodiments of the present invention, and the present invention will be further described below in conjunction with Figures 1 to 2.

[0034] Begin to perform the island detection method. In this islanding detection method, since there are multiple distributed power sources, the

[0036] The measuring device is implemented by measuring instruments or measuring instruments known in the art, including but not limited to ammeters and voltages

[0046] The curve of the offset θ is shown in Figure 3, and it can be seen from Figure 3 that ΔQ' can control the amplitude and direction of the offset. use

[0048] For the main inverter, its modulated wave is not affected by the system frequency. When ΔQ′ / 3UI∈(‑1,1), it is assumed that a

[0050] Step 1005, whether the absolute value |ΔQ'| of the PI adjustment value ΔQ' of the reactive power deviation value is greater than or equal to 30;

[0054] Step 1007, whether the absolute value |ΔQ'| of the PI adjust...

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Abstract

The invention relates to an islanding detection method for multiple distributed power sources based on inverter frequency control, which belongs to the technical field of anti-islanding protection. It is characterized in that it includes the following steps: step a, determine the main inverter; step b, obtain the difference of reactive power; step c, the PI adjustment value of the difference of reactive power and its absolute value |ΔQ′|; step d. Judging whether |ΔQ′| '|Whether it is greater than or equal to the second threshold, if it is greater than or equal to execute step g; otherwise return to step b; step g, cut off the distributed power supply. In this multi-distributed power island detection method based on inverter frequency control, after the multi-distributed power island effect occurs, the main inverter can stabilize the island frequency, which can effectively avoid the dilution effect and realize the detection of multi-distributed power Detection of isolated islands without blind spots.

Description

A multi-distributed power island detection method based on inverter frequency control technical field A kind of multi-distributed power islanding detection method based on inverter frequency control belongs to the field of anti-islanding protection technology. area. Background technique Anti-islanding protection is a kind of protection that needs to be configured in the grid-connected operation of distributed power sources. When the power supply is interrupted, if the distributed power supply is not cut off in time, the distributed power supply will continue to transmit power to the grid, bringing The risk of "reverse power transmission", on the one hand, will bring safety hazards to maintenance personnel, on the other hand, it will be affected by the intensity of light and temperature The output power of the inverter is fluctuating, and the voltage and frequency exceeding the limit caused by the unbalanced island power will easily damage the electrical equipment. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/46H02H7/26G01R21/06
CPCH02J3/388H02J3/381H02J3/466H02H7/26G01R21/06H02J2203/20H02J2300/40Y02E10/56
Inventor 张新慧张军彭克黄超艺尹凡
Owner SHANDONG UNIV OF TECH
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