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Method for reducing switching loss of SVG

A switching loss, small vector technology, applied in the direction of polyphase network asymmetry reduction, output power conversion devices, AC network circuits, etc., to achieve obvious effects, reduce the size of the heat sink, and reduce switching losses.

Inactive Publication Date: 2021-03-30
SHANDONG ELECTRICAL ENG & EQUIP GRP XINNENG TECH CO LTD
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Problems solved by technology

However, since only one small vector participates in the synthesis in the shaded area, the small vector can only be used first for the control of the midpoint voltage balance

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  • Method for reducing switching loss of SVG
  • Method for reducing switching loss of SVG
  • Method for reducing switching loss of SVG

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Embodiment Construction

[0023] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, not all, embodiments of the present invention.

[0024] A method to reduce SVG switching loss considering three-phase unbalance control, adding a new virtual vector V NM , the new virtual medium vector V NM It is synthesized from the original medium vector and two adjacent pairs of small vectors. Design a new virtual mid-vector V NM The principles are: 1) reduce the influence of the mid-point vector on the mid-point current; 2) in any area of ​​the space vector diagram, the basic vector of the synthetic reference vector contains two pairs of positive and negative small vectors.

[0025] The following is an example of region A, and the analysis methods for other regions are similar. The new virtual medium vector V NM0 defined as:

[0026] V NM0 =k A0 V M0 +k A1 V S0 +k A2 V S1 (1)

[0027] In ...

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Abstract

The invention relates to a method for reducing switching loss of an SVG, which considers three-phase imbalance treatment and adds a new virtual medium vector VNM. And the virtual middle vector is redefined, and the new virtual middle vector VNM is obtained by synthesizing the original middle vector and two adjacent pairs of small vectors. Therefore, the reference vector has two paired small vectors participating in synthesis in any area of the space vector diagram, one small vector is used for controlling the balance of the neutral-point voltage, and the other small vector is used for reducingthe switching loss of the SVG. An appropriate small vector is selected according to the midpoint voltage fluctuation and the switching sequence in each switching period, and the switching loss of thedevice is effectively reduced on the basis of controlling the balance of the midpoint voltage. According to the invention, the fluctuation of the midpoint voltage and the switching loss are reduced by selecting a proper small vector and controlling the switching action sequence in one switching period, and when the inverter is used for high voltage and high power, the loss reduction effect is more obvious, so that the size of the radiator is reduced, and the system cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of power grid operation and maintenance, and in particular relates to a method for reducing SVG switching losses in consideration of three-phase imbalance control. Background technique [0002] The SVG switching device mainly includes an IGBT module, and the IGBT module is mainly composed of a controllable IGBT switch tube T and an anti-parallel diode D. The calculation of the switching loss of the IGBT module is very complicated, and the specific calculation formula can refer to relevant literature. SVG switching loss mainly depends on the current flowing through the device and the switching frequency. Therefore, there are two main methods to reduce switching loss: [0003] 1) Minimize the switching times of the maximum current phase; [0004] 2) Reduce the switching frequency as much as possible, that is, the switching times of the device in a single cycle are the least. [0005] In the process of SVG s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02J3/26H02J3/18
CPCH02M1/00H02J3/26H02J3/1842Y02E40/10Y02E40/50
Inventor 刘鼎立商和龙张洪波李洪全孙建萍
Owner SHANDONG ELECTRICAL ENG & EQUIP GRP XINNENG TECH CO LTD
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