Phase angle compensation method, device, inverter and uninterrupted power source

A technology of inverter and phase angle, applied in the direction of reducing asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, converting irreversible DC power input into AC power output, etc., which can solve phase angle imbalance And other issues

Active Publication Date: 2018-01-30
EMERSON NETWORK POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the embodiments of the present invention is the unbalanced phase angle of the uninterruptible power supply parallel system with unbalanced loads

Method used

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  • Phase angle compensation method, device, inverter and uninterrupted power source
  • Phase angle compensation method, device, inverter and uninterrupted power source
  • Phase angle compensation method, device, inverter and uninterrupted power source

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Embodiment 1

[0066] Embodiment 1 of the present invention provides a method for phase angle compensation of an uninterruptible power supply parallel system, such as image 3 and Figure 4 shown, including:

[0067] Step S301, performing angle droop control on the active power and reactive power of a single parallel module in the UPS parallel system, and outputting an angle droop control amount;

[0068] Wherein, the angle droop control is specifically: subtracting the reactive power of a single parallel module from the active power of a single parallel module to obtain the difference between the active power and reactive power of a single parallel module; the negative angle droop coefficient The product multiplied by the difference between the active power and the reactive power of the single parallel module is used as the angle droop control amount.

[0069] This step is a part of the current balance adjustment, which is the angle droop control, where the angle droop control amount is -...

Embodiment 2

[0081] Embodiment 2 of the present invention provides an uninterruptible power supply parallel system phase angle compensation device 700, such as Figure 7 shown, including:

[0082] The angle droop control module 710 is used to control the active power and reactive power of a single parallel module in the uninterruptible power supply parallel system, and output the angle droop control amount;

[0083] A phase angle compensation control module 720, configured to perform phase angle compensation control on the average active power and average reactive power of all parallel modules in the uninterruptible power supply parallel system, and output the phase angle compensation control amount;

[0084] The angle setting module 730 is configured to perform angle setting on the angle droop control amount and the phase angle compensation control amount, and output the compensated phase angle.

[0085] Further, the angle droop control module 710 is specifically used to subtract the rea...

Embodiment 3

[0091] Embodiment 3 of the present invention provides an inverter 800, the inverter 800 is an inverter 800 in an uninterruptible power supply parallel system, such as Figure 8 As shown, the inverter 800 includes a controller 810 and an inverter circuit 820; wherein,

[0092] The controller 810 is used to control the angle droop of the active power and reactive power of a single parallel module in the uninterruptible power supply parallel system, and output the angle droop control amount; and control the angle droop in the uninterruptible power supply parallel system The average value of active power and reactive power of all parallel modules is controlled by phase angle compensation, and the control value of phase angle compensation is output; and the angle is given for the angle droop control value and phase angle compensation control value, and the output after compensation phase angle;

[0093] The inverter circuit 820 is configured to convert the received DC voltage into a...

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Abstract

The invention provides a phase angle compensation method, device, inverter and uninterrupted power source, which relate to the technical field of uninterrupted power source. The phase angle compensation method of uninterrupted power source combining system comprises the steps that the angle sagging control is conducted on the active power and reactive power of a single parallel module in the uninterrupted power source combining system, and the angle sagging controlled variable is output; the phase angle sagging control is conducted on the average value of the active power and reactive power ofall parallel modules in the uninterrupted power source combining system, and the phase angle compensation controlled variable is output; angle giving is conducted on the angle sagging controlled variable and the phase angle compensation controlled variable, and the phase angle after compensation is output. The invention resolves the problem of a conventional uninterrupted power source combining system that the phase angle is unbalanced with unbalanced load.

Description

【Technical field】 [0001] The invention relates to the technical field of uninterruptible power supply, in particular to a phase angle compensation method, device, inverter and uninterruptible power supply. 【Background technique】 [0002] In the existing uninterruptible power system (Uninterruptible Power System / Uninterruptible PowerSupply, UPS) parallel system, if only the frequency droop control is used, the synchronization of the inverter frequency and the bypass frequency cannot be achieved. Therefore, the existing uninterruptible power supply parallel system has added a power frequency synchronization signal to realize the function that the output voltage frequency does not shift when the parallel machine adopts phase angle droop control. With the technical level of uninterruptible power supply system and the continuous development of the industry, the requirements for uninterruptible power supply are becoming more and more stringent. At the specified frequency point, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02M7/42H02J3/08
CPCY02E40/50
Inventor 易小强李秀亮黄杰标肖英刘遂明
Owner EMERSON NETWORK POWER CO LTD
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