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System for correction of harmonic content in electric power circuit, system for control of electric motors, and refrigeration compressor

A technology for power circuits and compressors, applied in the field of refrigeration compressors and systems with harmonic content, can solve the problems of economic infeasibility, cumbersomeness, and high energy consumption of equipment.

Inactive Publication Date: 2017-09-29
WHIRPOOL SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sizing the inductor in order to maintain its inductive properties even under transient conditions directly affects the inductor core and thus the inductor size
As a result, inductors take up a lot of space in the circuit, making them expensive, bulky, and / or very bulky, often making the device economically unviable or resulting in high energy consumption

Method used

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  • System for correction of harmonic content in electric power circuit, system for control of electric motors, and refrigeration compressor
  • System for correction of harmonic content in electric power circuit, system for control of electric motors, and refrigeration compressor
  • System for correction of harmonic content in electric power circuit, system for control of electric motors, and refrigeration compressor

Examples

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Comparison scheme
Effect test

example 1

[0037] Example 1 - System for correcting harmonic content of current in a power circuit in a refrigeration compressor.

[0038] The invention provides a system for correcting harmonic content in a power circuit comprising an inductor (L) as a reactive element. The core of the inductor is dimensioned to be small, but to meet the maximum current requirements of the converter controlling the motor, which in this embodiment is a frequency converter, under maximum load conditions. In this embodiment, the maximum load condition is the maximum load condition of cooling (10), where the motor operating maximum temperature also occurs. In this embodiment, the core of the inductor is sized to operate in the saturation region during the cool down cycle (10) of the compressor with variable capacity.

[0039] Such as figure 1 It can be seen in , that at times when the motor current is high, ie, during the cool down cycle (10), the inductor operates with the core saturated and thus exhibit...

example 3

[0046] Example 3 - System for controlling an electric motor equipped with a harmonic content reduction circuit with an inductor located upstream.

[0047] In one embodiment, such as image 3 As shown, an inductor (L) is inserted into the electric motor control circuit (34) with one terminal connected to the power supply (30) and the other terminal connected to the rectification system (31).

example 4

[0048] Example 4 - System for controlling an electric motor equipped with a harmonic content reduction circuit with an inductor located downstream.

[0049] In another embodiment, such as Figure 4 As shown, an inductor (L) is inserted with one terminal connected to the frequency converter (33) and capacitive filter (32) and the other terminal connected to the frequency converter (33). The connection of the inductor (L) to the system for controlling the electric motor (34) can take many forms and is not limited to the two presented embodiments.

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Abstract

The present invention relates to the fields of power electronics and electric motors, and describes a system for correcting harmonic content in power systems. The invention solves the space and weight problem, associated with the core of an inductor for correcting harmonic content, also providing performance advantages of electric motors, such as higher available voltage at maximum load and higher rotational speed at maximum load. The invention is particularly useful in refrigeration compressors.

Description

technical field [0001] The invention relates to the fields of power electronics and electric motors. More specifically, the present invention describes a system for correcting harmonic content in electric power circuits, a system for controlling electric motors and a refrigeration compressor. Background technique [0002] Currently, various types of electric motors, typically AC motors, use devices called frequency inverters to control the motors, such as speed control, starting and other parameters. [0003] However, converters have non-linear voltage and current functions, that is, they do not follow straight lines. Non-linear elements pollute their supply sources with a large number of low harmonics, thereby acting on their supply sources, thereby distorting the supply and causing degradation of power quality and enlargement of the distribution network size. [0004] Due to the effects of current and voltage distortions, increased electrical losses of the facility and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/50H02J3/01
CPCH02J3/01H02P27/06H02M1/4266Y02B70/10H02P29/50F25B49/025F25B2600/021H02M1/126H02M7/06
Inventor E·捷斯克G·J·玛斯
Owner WHIRPOOL SA
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