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High-frequency oscillation suppression method for inverter parallel connection in island mode

A high-frequency oscillation, island mode technology, applied in the direction of reducing/preventing power oscillation, reducing flicker in AC network, reducing harmonic/ripple in AC network, etc., can solve problems such as oscillation, affecting system stability and power quality , to achieve the effect of suppressing harmonic resonance

Pending Publication Date: 2021-11-16
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase in the number of inverters will amplify this phenomenon and cause serious oscillations, which will affect the stability of the system and power quality. Therefore, it is necessary to suppress this oscillation phenomenon and ensure the stable operation of the system

Method used

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  • High-frequency oscillation suppression method for inverter parallel connection in island mode
  • High-frequency oscillation suppression method for inverter parallel connection in island mode
  • High-frequency oscillation suppression method for inverter parallel connection in island mode

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Embodiment Construction

[0028] Below in conjunction with embodiment the present invention is described in further detail:

[0029] Such as Figure 1 to Figure 6 As shown, a high-frequency oscillation suppression method for parallel inverters in island mode is introduced. The method introduces a virtual damping control link and an advanced compensation link to realize high-frequency oscillation suppression for an inverter parallel system in island mode, including the following step:

[0030] A. Sampling link

[0031] At the beginning of the sampling period, the capacitor voltage V of each inverter is collected c and capacitive current I c as a state variable;

[0032] B. Virtual damping control link

[0033] The capacitor voltage V collected by each inverter c and capacitive current I c Respectively through the filtering control link G f1 , G f2 Then make the sum to get the high-frequency control component I of each inverter h ;

[0034]

[0035]

[0036] Among them, the filtering con...

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Abstract

The invention discloses a high-frequency oscillation suppression method for inverter parallel connection in an island mode and relates to the technical field of inverter parallel stable operation. The method comprises the following steps of: a, collecting the capacitor voltage and the capacitor current of each inverter as state variables; b, making the capacitor voltage and the capacitor current of each inverter pass through a filtering control link, and carrying out summation; c, adding the sum of the outputs of the inverters passing through the filtering control link to an output end of current control to complete a virtual damping control link; and d, adding lead compensation in the circuit. According to the method of the invention, the high-frequency oscillation under the parallel connection of the inverters is effectively suppressed, the high-frequency harmonic content is reduced, and the stability of the system is enhanced.

Description

technical field [0001] The invention relates to the technical field of inverter parallel stable operation, in particular to a high-frequency oscillation suppression method for inverter parallel connection in an island mode. Background technique [0002] The normal operation of the AC microgrid needs to ensure stability from the inverter level to the microgrid system level when multiple inverters are connected in parallel. At present, for remote areas, natural disasters and line failures, the microgrid needs to maintain island operation. At this time, the parallel and stable operation of inverters in island mode is particularly important. On the one hand, it can ensure the effective use of energy, and on the other hand, it can also solve the problem of difficult electricity consumption, so that the operation of the microgrid in the island mode can be developed. For the parallel connection of multiple machines in the island mode, due to the difference of line impedance, the c...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/01H02J3/00H02J3/38
CPCH02J3/241H02J3/01H02J3/002H02J3/388H02J2203/20Y02E40/40
Inventor 王晓寰黄鹏柴秀慧赵晓君
Owner YANSHAN UNIV