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A method and device for current sharing control

A technology of flow control and compensation control, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problem of large drop in the output voltage of the inverter

Active Publication Date: 2021-02-02
SICON CHAT UNION ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention proposes a current sharing control method and device, which solves the problem in the prior art that when multiple inverters are connected in parallel and the PQ drooping control method is used for current sharing control, the inverter output voltage drops greatly

Method used

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  • A method and device for current sharing control
  • A method and device for current sharing control
  • A method and device for current sharing control

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Experimental program
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Embodiment 1

[0094] like Figure 2-Figure 4 As shown, the present invention proposes a current sharing control method, including

[0095] S101: Obtain the operation data of a single inverter,

[0096] S102: Obtain the droop control component U according to the operation data of a single inverter ref1 ,

[0097] S103: Obtain the compensation control component U according to the operation data of a single inverter ref2 , the compensation control component U ref2 with droop control component U ref1 The calculation method is the same,

[0098] S104: Set the droop control component U ref1 and compensating control component U ref2 Superimposed to the reference voltage command U ref0 In , the reference voltage command U of the single inverter voltage outer loop control is obtained ref* ,Specifically:

[0099] u ref * =U ref0 -U ref1 +U ref2

[0100] S105: According to the reference voltage instruction U ref * , for voltage outer loop and current inner loop control.

[0101] In ...

Embodiment 2

[0130] Based on the same inventive concept as the current sharing control method in Embodiment 1, the present invention also provides a current sharing control device, such as Figure 5 shown, including

[0131] The first sampling unit is used to sample the operating data of a single inverter, including the voltage U n , current I n and frequency ω n ,

[0132] The first calculation unit is used for the current I n Decomposed in the dq coordinate system to get I d and I q ,

[0133] The second obtaining unit is used to obtain the I of multiple inverters d and I q , and according to the I of multiple inverters d and I q Calculate I davg and I qavg ,

[0134] A second computing unit for the I of a single inverter based on d and I q Calculate the droop control d-axis component U dref1 and droop control q-axis component U qref1 ,

[0135] The third calculation unit, I for multiple inverters davg and I qavg Calculation of compensation control d-axis component U ...

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Abstract

The invention belongs to the technical field of inverter parallel connection, and proposes a current equalization control method and device, including obtaining the operation data of a single inverter; and obtaining the droop control component U according to the operation data of a single inverter ref1 ; According to the operating data of a single inverter, the compensation control component U is obtained ref2 ; Set the droop control component U ref1 and compensating control component U ref2 Superimposed to the reference voltage command U ref0 In , the reference voltage command U of the single inverter voltage outer loop control is obtained ref * ; According to the reference voltage command U ref * , for voltage outer loop and current inner loop control. Through the above technical solution, the problem of a large drop in the output voltage of the inverters in the prior art when multiple inverters are connected in parallel and the PQ droop control method is used for current sharing control is solved.

Description

technical field [0001] The invention belongs to the technical field of parallel connection of inverters, and relates to a current sharing control method and device. Background technique [0002] Parallel operation of inverters is an effective way to realize large-capacity power supply and redundant power supply, and it is one of the important directions for the development of inverter technology today. Multiple inverters connected in parallel to achieve capacity expansion can greatly improve the flexibility of the system, greatly reduce the volume and weight of the power supply system, and at the same time greatly reduce the current stress of the main switching device, fundamentally improve reliability, reduce costs and Improve power density. When the output voltage amplitudes, frequencies, and phases of each inverter power supply are equal, the voltage difference is zero, and the parallel operation is the most ideal state. However, in the actual parallel inverter power su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/493
CPCH02M7/493
Inventor 周文飞李世伟石鑫刚肖健健
Owner SICON CHAT UNION ELECTRIC CO LTD
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