A self-checking method for switching tubes of T-type three-level inverters 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: 2022-02-22
QINGDAO TOPSCOMM COMM +1
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However, the existing switching tube detection module requires an additional circuit, which increases the cost of equipment
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[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] A self-inspection method for switching tubes of a T-type three-level inverter applied to SVG. The inverter is a T-type three-level inverter, including a bus capacitor C1, a bus capacitor C2, a switch tube T1, and a switch tube T2, switch tube T3, switch tube T4, inductor L1, inductor L2 and filter capacitor C3;
[0041] The connection relationship is: the first end of the capacitor C1 is connected to the collector of the switching tube T1, and the emitter of the switching tube T1 is respectively connected to the emitter of the switching tube T3, the collector of the switching tube T4, and th...
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The present invention provides a T-type three-level inverter switching tube self-checking method applied to SVG, comprising the following steps: S1, determining whether the DC bus is normal according to the ratio of the actual bus voltage sampling value to the input voltage peak value; S2, Check whether the voltage of the filter capacitor of the T-type three-level inverter is normal; S3, apply the PWM drive signal to the switch tube of the T-type three-level inverter, and determine the inductor current threshold according to the calculated sum of the theoretical value of the inductor current, and set the The actual value of the inductor current obtained by sampling is compared with the threshold value of the inductor current, and then it is judged whether the switch tube is normal. The invention can timely and comprehensively detect the abnormal situation of the switching tube of the T-type three-level grid-connected inverter through the detection of the DC bus voltage, the detection of the filter capacitor voltage and the sequential detection of the switching tube without additional circuit or equipment, On the premise that further damage to the inverter can be avoided, the equipment cost is reduced.
Description
technical field [0001] The invention relates to an inverter self-inspection method, in particular to a T-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 T-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] The hysteresis control has the characteristics of high-frequency sampling, so it can be used in the self-test of the switc...
Claims
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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