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Method and device for suppressing zero-sequence circulating current between common direct-current bus parallel inverters

A zero-sequence circulating current and suppressing device technology, applied in the direction of converting irreversible DC power input to AC power output, output power conversion devices, electrical components, etc., can solve problems such as failure, easy communication failure control, etc. Ineffective effect

Pending Publication Date: 2022-06-24
西安西电高压开关有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, this application provides a method and device for suppressing zero-sequence circulating current between parallel inverters with a common DC bus, which is used for suppressing zero-sequence circulating current between multiple parallel inverters, so as to solve the problems in the prior art. The problem of control failure due to communication failure

Method used

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  • Method and device for suppressing zero-sequence circulating current between common direct-current bus parallel inverters
  • Method and device for suppressing zero-sequence circulating current between common direct-current bus parallel inverters
  • Method and device for suppressing zero-sequence circulating current between common direct-current bus parallel inverters

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Embodiment 1

[0044] figure 1 This is a flowchart of a method for suppressing zero-sequence circulating current between inverters in parallel with a common DC bus according to an embodiment of the present application.

[0045] The suppression method provided in this embodiment is applied to any inverter in an environment where multiple inverters are connected in parallel. The relationship between the multiple inverters here is a common DC bus, and the AC output ends are connected in parallel. Specifically as figure 2 shown.

[0046] like figure 1 As shown, the suppression method in this embodiment includes the following steps:

[0047] S1. Collect the three-phase current output by the inverter.

[0048] Collect the three-phase current i output by the AC output terminal of the corresponding inverter through the current sensor of each inverter abc .

[0049] S2. Obtain the first control parameter according to the three-phase current and the given current value.

[0050] The first con...

Embodiment 2

[0082] Image 6 This is a block diagram of an apparatus for suppressing zero-sequence circulating current between inverters in parallel with a common DC bus according to an embodiment of the present application.

[0083] The suppression device provided in this embodiment is applied to any inverter in an environment where multiple inverters are connected in parallel. The relationship between the multiple inverters here is a common DC bus, and the AC output ends are connected in parallel. Specifically as figure 2 shown.

[0084] like Image 6 As shown, the suppression device in this embodiment includes a current acquisition module 10 , a first calculation module 20 , a second calculation module 30 and a control execution module 40 .

[0085] The current collection module is used to collect the three-phase current output by the inverter.

[0086] Specifically, the three-phase current i output by the AC output terminal of the corresponding inverter is collected by the curren...

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Abstract

The invention discloses a method and device for suppressing zero-sequence circulating current between common direct-current bus parallel inverters, and the method and device are applied to any one of the common direct-current bus parallel inverters, and specifically comprise the steps: collecting three-phase current outputted by the inverter; obtaining a first control parameter according to the three-phase current and a given current value; obtaining a second control parameter according to the three-phase current and the reference instruction value; and controlling and outputting to a pulse width modulation controller of the inverter based on the first control parameter and the second control parameter so as to realize suppression of the zero-sequence commutation. Obviously, when suppression control is carried out on the zero-sequence commutation of the inverter, communication with other inverters is not needed, so that the problem of control failure caused by easy communication failure in the prior art is solved.

Description

technical field [0001] The present application relates to the technical field of electric power equipment, and more particularly, to a method and device for suppressing zero-sequence circulating current between parallel inverters with a common DC bus. Background technique [0002] In order to improve the power level of the system, in high-current applications, such as power drag, energy storage converters, and new energy power generation, it is often used to connect multiple inverters in parallel. By connecting the inverters in parallel, the power level, reliability and efficiency of the system can be greatly improved, and it also brings convenience to the capacity expansion of the system and the design of the converter. When multiple inverters with a common DC bus are connected in parallel on the AC side, a zero-sequence circulating current will be formed between the parallel inverters, resulting in a zero-sequence circulating current flowing between the parallel inverters....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M1/12H02M1/088H02M7/48H02J3/38
CPCH02M1/32H02M1/12H02M1/088H02M7/48H02J3/38
Inventor 王莉白世军金猛黄煜林张玉荣田楠胡丁文满新锁
Owner 西安西电高压开关有限责任公司
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