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A midpoint potential balance control method and device based on current polarity

A potential balance and current polarity technology, which is applied in output power conversion devices, electrical components, and single-grid parallel feeding arrangements, etc., can solve the problems of complex mid-point potential balance control and so on.

Inactive Publication Date: 2021-08-03
北京泽维斯智能技术有限公司 +3
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Problems solved by technology

[0004] In view of this, the purpose of one or more embodiments of this specification is to propose a current polarity-based midpoint potential balance control method and device to solve the relatively complicated problem of midpoint potential balance control

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  • A midpoint potential balance control method and device based on current polarity
  • A midpoint potential balance control method and device based on current polarity
  • A midpoint potential balance control method and device based on current polarity

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Embodiment Construction

[0038] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0039] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present specification shall have ordinary meanings understood by those skilled in the art to which the present disclosure belongs. Words such as "comprise" or "comprising" used in one or more embodiments of this specification mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, and do not exclude other components or objects. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", ...

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Abstract

One or more embodiments of this specification provide a current polarity-based midpoint potential balance control method and device, including: collecting the three-phase current polarity on the AC side of the three-level inverter, and dividing the three-level vector space; According to the position of the large sector, obtain the midpoint current value; obtain the voltage difference between the upper and lower capacitors on the DC side; obtain the polarity of the balance factor according to the voltage difference and the midpoint current value; adjust the voltage difference to obtain the balance factor The size of the balance factor; according to the polarity of the balance factor and the size of the balance factor, the balance factor is obtained; the balance factor is introduced into the seven-segment SVPWM algorithm, and the action time of the positive and negative small vectors is adjusted to adjust the midpoint of the three-level inverter Potential for balance control. The present invention only needs to collect the three-phase current on the AC side of the three-level inverter and the upper and lower capacitor voltage signals on the DC side, without additionally collecting the three-phase voltage, and does not need to discuss the small sector to which the reference voltage belongs to solve the midpoint potential balance Control more complex problems.

Description

technical field [0001] One or more embodiments of this specification relate to the technical field of inverter balance control, and in particular to a method and device for midpoint potential balance control based on current polarity. Background technique [0002] The three-level topology has a higher voltage output capability, and the current harmonic suppression ability is better at the same switching frequency. Under the premise of the same output harmonic index, the switching frequency of each power electronic device in the three-level topology can be appropriately reduced. , thereby improving the reliability of the system. However, due to the uneven charging of the upper and lower capacitors by the midpoint current in the topological structure of the three-level converter, the problem of midpoint potential imbalance occurs. The unbalanced midpoint potential will increase the harmonic components of the AC side and distort the output voltage; it will also affect the serv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387H02M1/32H02M1/12H02J3/38
CPCH02M1/12H02M1/32H02M7/483H02M7/53871
Inventor 刘海朋蒲廷燕李言华王喜莲程艳于芃
Owner 北京泽维斯智能技术有限公司
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