Neutral point potential balance control method and device based on current polarity

A technology of potential balance and current polarity, which is applied in the direction of output power conversion devices, electrical components, single-network parallel feeding arrangements, etc., and can solve problems such as complex midpoint potential balance control

Inactive Publication Date: 2020-06-02
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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  • Neutral point potential balance control method and device based on current polarity
  • Neutral point potential balance control method and device based on current polarity
  • Neutral point 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 the invention provide a neutral-point potential balance control method and device based on the current polarity. The method comprises the steps of collecting the three-phasecurrent polarity of an alternating-current side of a three-level inverter, and dividing a three-level vector space; obtaining a neutral point current value according to the position of the large sector; obtaining a voltage difference value of an upper capacitor and a lower capacitor of the direct-current side; obtaining the polarity of a balance factor according to the voltage difference value and the neutral point current value; adjusting the voltage difference value to obtain the size of a balance factor; obtaining a balance factor according to the polarity of the balance factor and the size of the balance factor; and introducing the balance factor into a seven-segment SVPWM algorithm, and adjusting the action time of positive and negative small vectors so as to carry out balance control on the neutral point potential of the three-level inverter. According to the invention, only three-phase current signals on the alternating-current side and upper and lower capacitor voltage signalson the direct-current side of the three-level inverter need to be collected, three-phase voltage does not need to be additionally collected, discussion does not need to be conducted on a small sectorto which reference voltage belongs, and thus the problem that neutral point potential balance control is complex is solved.

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 Applications(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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