I-type three-level inverter switching tube self-checking method applied to SVG

A technology of three-level inverters and switching tubes, which is applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of increasing equipment costs, and achieve the effect of realizing equipment costs and avoiding damage

Active Publication Date: 2021-12-07
QINGDAO TOPSCOMM COMM +1
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  • Abstract
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  • Claims
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Problems solved by technology

However, the existing switching tube detection module requires an additional circuit, which increases the cost of equipment

Method used

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  • I-type three-level inverter switching tube self-checking method applied to SVG
  • I-type three-level inverter switching tube self-checking method applied to SVG
  • I-type three-level inverter switching tube self-checking method applied to SVG

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] Such as figure 1 As shown, a method for self-checking the switching tube of an I-type three-level inverter applied to SVG, the inverter is an I-type three-level inverter, including a bus capacitor C1, a bus capacitor C2, and a switch tube T1 , switch tube T2, switch tube T3, switch tube T4, diode D5, diode D6, inductor L1, inductor L2 and filter capacitor C3;

[0041] The connection relationship is as follows: the first end of the capacitor C1 is connected to the collector of the switching tube T1, the emitter of the switching tube T1 is connected to the collector of the switching tube T2 a...

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Abstract

The invention provides an I-type three-level inverter switching tube self-checking method applied to SVG. The I-type three-level inverter switching tube self-checking method comprises the following steps: S1, judging whether a direct-current bus is normal or not according to the ratio of an actual bus voltage sampling value to an input voltage peak value; S2, detecting whether the filter capacitor voltage of the I-type three-level inverter is normal or not; and S3, applying a PWM driving signal to a switching tube of the I-type three-level inverter, determining an inductive current threshold value according to the calculated theoretical value of the inductive current, and comparing the sampled actual value of the inductive current with the inductive current threshold value so as to judge whether the switching tube is normal or not. According to the I-type three-level grid-connected inverter switching tube detection method, the abnormal condition of the I-type three-level grid-connected inverter switching tube can be timely and comprehensively detected through direct-current bus voltage detection, filter capacitor voltage detection and sequential detection of the switching tube without an additional circuit or equipment, and the equipment cost is reduced on the premise that the inverter can be prevented from being further damaged.

Description

technical field [0001] The invention relates to an inverter self-inspection method, in particular to an I-type three-level inverter switch tube self-inspection method applied to SVG. Background technique [0002] The static var generator (Static Var Generator, SVG) is a grid-connected inverter device, which can control the problems of reactive power, harmonics, and low power factor on the low-voltage side by connecting it in parallel with the low-voltage line and injecting current into the grid. . The I-type three-level inverter is a common topology, and the switching tube is the core circuit of the inverter. Timely detection of the abnormality of the switching tube of the inverter can prevent further damage to the inverter. However, the existing switching tube detection module requires an additional circuit, which increases the equipment cost. [0003] Hysteresis control has the characteristics of high-frequency sampling, so it can be used in the self-test of I-type grid-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M1/32H02M7/483G01R31/40G01R31/27
CPCH02M1/00H02M1/32H02M7/483G01R31/40G01R31/27
Inventor 范建华曹乾磊马玉坤杨森
Owner QINGDAO TOPSCOMM COMM
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