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Method for determining rectifier-stage output current and/or grid-side currents of a frequency converter

A technology of outputting current and frequency converter, which is applied in the conversion device of AC power input to AC power output, output power, and only measuring current, which can solve problems such as a lot of extra space.

Pending Publication Date: 2021-02-12
DANFOSS POWER ELECTRONICS AS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this requires current sensors, which negatively impact the cost level of the frequency converter and often require a lot of additional space

Method used

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  • Method for determining rectifier-stage output current and/or grid-side currents of a frequency converter

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Embodiment Construction

[0032] The frequency converter 1 is connected to a grid 6 having three phases u, v and w. The grid behaves as some grid impedance 2 for each phase. Alternatively, the grid impedance module 2 may represent the total AC inductance of the frequency converter module 1 .

[0033]For the convenience of the following explanation, the circuit diagram is divided into a grid side 6 , a rectifier stage 7 , an inverter stage 8 and a motor side 9 .

[0034] The rectifier stage 7 includes a passive rectifier 3 . The passive rectifier 3 is formed from rectifier silicon devices, such as diodes D1-D6 generally known in the art. Alternatively, the diodes may be thyristors which are used for inrush current limiting in some frequency converters. The shown rectifier 3 is a 3-phase rectifier, but could also be a single-phase rectifier or another multi-phase rectifier. The DC link inductance Ldc is connected to the output side of the rectifier 3 . Alternatively, it may be the case with two DC c...

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Abstract

A method for determining rectifier-stage output current and / or grid-side currents (iu, iv, iw) of a frequency converter (1) having a passive rectifier (3), an inverter (4), a DC-link with a DC-link inductor (Ldc) and a DC-link capacitor (Cdc) between the rectification stage (3) and the inverter stage (4) is described. In a frequency converter the current information for the grid-side currents (iu,iv, iw) should be obtained without a current sensor at the grid-side (2). To this end the method comprises the step of calculating a current in the DC-link (5) by using at least a voltage value (Urec) and characteristics of the rectifier (3) in the DC-link (5) and / or grid side currents to form a corrected current using the calculated current and a measured current or currents or a fraction of a measured current or currents, or a fraction of a measured current or currents.

Description

technical field [0001] The invention relates to a method for determining the rectifier stage output current and / or grid-side current of a frequency converter having a passive rectifier, an inverter, a rectifier and an inverter with a DC link inductor and a DC Link capacitors for the DC link and / or AC inductors for the grid side of the rectification stage. Background technique [0002] Frequency converters are generally used to convert electrical input power with a predetermined frequency provided from an electrical grid into electrical output power with another frequency that is controllable. The current and voltage supplied from the grid side is rectified by a rectification stage and smoothed to some extent in the DC link by means of a DC link capacitor, a DC link inductor and / or an AC inductor on the grid side. The DC voltage and current in the DC link are then converted to AC voltage and current in a controlled manner by an inverter stage. [0003] The interesting thing...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M1/00
CPCH02M5/293H02M1/0009H02M5/2932H02M1/44H02M5/458G01R19/22G01R19/0092H02M1/08
Inventor 亨里克·罗森达尔·安诺生
Owner DANFOSS POWER ELECTRONICS AS
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