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A Droop Control Method Based on Mode Switching

A control method and mode switching technology, applied in the direction of reducing/preventing power oscillation, AC network circuit, single-network parallel feeding arrangement, etc., can solve the problems such as inability to suppress the inrush current, and achieve the suppression of network side inrush current and stable power Loss of control, stability-enhancing effects

Active Publication Date: 2022-02-01
CHINA UNIV OF MINING & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the frequency fluctuation of the point of common coupling (PCC) is too large and the transmission line is inductive, the traditional active power droop control method cannot suppress the inrush current when the grid frequency fluctuates greatly

Method used

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  • A Droop Control Method Based on Mode Switching
  • A Droop Control Method Based on Mode Switching
  • A Droop Control Method Based on Mode Switching

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Embodiment Construction

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] A droop control method based on mode switching, when the grid frequency and voltage amplitude fluctuation do not exceed the critical value, the traditional sag control method is used, and the sag controller control formula is:

[0031] Ω n ω 0 = -M n (P n -P 0 )

[0032] U n -U 0 = -N n (Q) n -Q 0 );

[0033] When the grid frequency fluctuation exceeds the threshold and the power grid voltage amplitude fluctuation does not exceed the threshold, the control formula of the salap controller is:

[0034]

[0035] U n -U 0 = -N n (Q) n -Q 0 );

[0036] The control formula of the salap controller is:

[0037] Ω n ω 0 = -M n (P n -P 0 )

[0038]

[0039] When the grid frequency and voltage amplitude fluctuate exceeds the critical value, the control formula of the saga controller is:

[0040]

[0041] Where Ω 0 Inverter rated voltage angular frequency, U 0 The rating of...

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Abstract

The invention discloses a droop control method based on mode switching, which is used for inverter control. When the grid frequency and voltage amplitude fluctuations do not exceed the critical value, the control method adopts the traditional droop control mode; when the grid frequency fluctuation exceeds the critical value and the voltage amplitude fluctuation exceeds the critical value, the control formulas are respectively: When the impact of instantaneous frequency fluctuation is large, the grid-connected inverter can be equipped with fault ride-through capability only by designing the control strategy without additional hardware circuits; At the same time, it also has the ability to pass through large frequency fluctuations.

Description

Technical field [0001] The present invention relates to an inverter salap control method, and is specifically a plurality of sagging control methods based on mode switches, belonging to the field of photovoltaic power generation. Background technique [0002] Dropping control is a control method of microgrid. It is controlled by controlling the micro-source output in the micrometer to obtain a stable frequency and voltage, and there is no need for communication coordination between the unit. Plug and play and peer-to-peer control targets to ensure unity of power balance and frequency in the micro-grid under the island, which has a simple and reliable feature. [0003] However, when the public coupling point (PCC) frequency fluctuation is too large, the transmission line is inductively, and the traditional active power saving control method cannot suppress the impact current when the grid frequency is greatly fluctuated. The ability of the inverter to withstand the impact current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/38
CPCH02J3/24H02J3/38H02J2203/20
Inventor 耿乙文祝琳王凯宋宣锋
Owner CHINA UNIV OF MINING & TECH
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