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Method for detecting low impedance condition at output of electrical converter, control unit, computer program product and electrical converter

A technology of electric converter and control unit, which is applied in the direction of measuring current/voltage, converting DC power input to DC power output, measuring electricity, etc., and can solve problems such as turn-off delay

Pending Publication Date: 2020-12-29
DANFOSS POWER ELECTRONICS AS
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Problems solved by technology

The rapid increase in current delays the turn-off of the IGBT, which results in a situation where the current is turned off above the SOA (safe operating area) level of the IGBT

Method used

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  • Method for detecting low impedance condition at output of electrical converter, control unit, computer program product and electrical converter
  • Method for detecting low impedance condition at output of electrical converter, control unit, computer program product and electrical converter
  • Method for detecting low impedance condition at output of electrical converter, control unit, computer program product and electrical converter

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Embodiment Construction

[0044] Figure 1A to Figure 1C An electrical converter 10 according to some embodiments of the invention is schematically illustrated. Figure 1A A frequency converter is shown coupled to an electrical load L such as an electric machine (eg an induction machine). Preferably, the frequency converter 10 is also connectable to a grid 30 or other power source 30 . exist Figure 1A Here, the grid 30 is, for example, a three-phase grid 30 .

[0045] In various embodiments, the converter 10 may include a current measurement device 50 or a plurality of current measurement devices 50 for measuring the current(s) at the output 15 of the converter 10 .

[0046] Frequency converters may include: line side sections such as Figure 1A shown on the left in the rectifier and includes diodes; and load-side sections such as Figure 1A An inverter is shown on the right in and includes controllable semiconductor switches such as IGBTs or SiC (Silicon Carbide) JFETs (Junction Field Effect Tran...

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Abstract

A method for detecting low impedance condition at an output (15) of an electrical converter (10), a control unit (1000), a computer program product, and an electrical converter (10) are presented. Themethod comprises determining (110) a first current value (I1(T1)) of a first current (I1), and a second current value (I1(T2)) of the first current (I1), and determining (120) a first current difference ([Delta]I1) between the first (I1(T1)) and the second (I1(T2)) current values, and comparing (130) the first current difference ([Delta]I1) to a first current difference threshold (I1_TH), and ifthe first current difference ([Delta]I1) is of predefined magnitude with respect to the first current difference threshold (I1_TH), such as higher, turning off (140) a first voltage (U1) driving the first current (I1), such as by switching off a corresponding switch or switches for applying the first voltage (U1) to the output (15).

Description

technical field [0001] The present invention generally relates to electrical converters, such as frequency converters or inverters. In particular, but not exclusively, the invention relates to controlling the operation of an electrical converter to detect a low impedance condition at the output of the converter. Background technique [0002] There are known solutions for detecting when an electrical converter has a very low output impedance condition, eg a short circuit condition. This will cause overcurrent if the low impedance condition persists for too long. Event based methods are known for detecting a low impedance condition, such as by measuring the current, and setting a certain trip level to stop the operation of the converter in case of an excessive current value. Another event-based approach is based on desaturation detection of IGBTs (Insulated Gate Bipolar Transistors) included in the converter. This can be done by measuring the voltage across the IGBT while s...

Claims

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Application Information

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IPC IPC(8): G01R19/10G01R19/165G01R31/42G01R31/52
CPCG01R31/42G01R19/10G01R19/165G01R31/50H02M1/32H02M1/36H02M5/458G01R1/42
Inventor 尼克拉斯·索多朱哈·诺伦娜
Owner DANFOSS POWER ELECTRONICS AS
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