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Rotating electromagnetic energy transformation device

An energy conversion and electromagnetic technology, which is applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, reactive power compensation, etc. It can solve the problems of high device cost, reduction of grid power factor, and low overload capacity of devices.

Inactive Publication Date: 2009-02-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a rotating electromagnetic energy conversion device to overcome the high cost of devices and the disadvantages of existing static var compensators, static var generators and power active filters due to the use of power semiconductor devices. The defects of low reliability and low overload capacity of the device, and at the same time overcome the defects that the use of transformers to transform AC voltage will generate harmonic currents, reduce the power factor of the grid, and the transformer cannot isolate the harmonics of the primary side and the secondary side
The present invention mainly uses the wound rotor induction motor 1 as the energy conversion device, avoiding the defects of high device cost, low device reliability and low overload capacity of the device caused by the use of power semiconductor devices, and also overcomes the use of transformers to convert AC The voltage will generate harmonic currents, reduce the power factor of the grid and the defect that the transformer cannot isolate the harmonics of the primary side and the secondary side

Method used

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specific Embodiment approach 1

[0009] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. This embodiment is composed of a wound rotor induction motor 1, a power converter 2, a clutch 3 and a prime mover 4. The wound rotor induction motor 1 includes a No. 1 stator winding 1-1, a No. 2 stator winding 1-2 and a rotor Winding 1-3, the rotor of the wound rotor induction motor 1 is coaxially connected with the prime mover 4 through the clutch 3, the first stator winding 1-1, the second stator winding 1-2 and the rotor winding 1-3 are all three-phase Symmetrical winding, the three-phase terminals of the output end of the second stator winding 1-2 are respectively connected to the three-phase terminals of the power input end of the power converter 2, and the three-phase terminals of the power output end of the power converter 2 are respectively connected to the three-phase terminals of the input end of the rotor winding 1-3 . The power converter 2 ...

specific Embodiment approach 2

[0014] Specific implementation mode two: the following combination figure 2 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is: there are harmonic injection windings 1-5 on the rotor of the wound rotor induction motor 1, and the three-phase terminals at the input ends of the harmonic injection windings 1-5 are connected to the power converter 2 Three-phase terminal on the other output. In this embodiment, the rotor of the wound rotor induction motor 1 has two sets of windings, one set is an AC excitation winding, and the other set is a harmonic injection winding, and the two sets of windings pass through slip rings, brushes and power converter 2 respectively. connected to the output. In this way, separate control of excitation current and harmonic suppression current can be realized.

specific Embodiment approach 3

[0015] Specific implementation mode three: the following combination image 3 This embodiment will be specifically described. The difference between this embodiment and Embodiment 1 is that it also includes an exciter 5, the three-phase terminals of the power output end of the power converter 2 are respectively connected to the three-phase stator excitation winding 5-3 of the exciter 5, and the winding type rotor induction The rotor of the motor 1 is coaxially connected with the rotor of the exciter 5, and the rotor winding 1-3 of the wound rotor induction motor 1 is reversely connected with the rotor winding 5-1 of the exciter 5 to realize the connection between the wound rotor induction motor 1 and the excitation cascade of machine 5. In this embodiment, the rotor winding of the wound rotor induction motor 1 is not connected to the output end of the power converter 2 through a slip ring or a brush, but is connected to the output end of the power converter 2 through an excit...

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Abstract

Circumrotating electromagnetism type energy transform device, the invention relates to a electromagnetism type energy transform device that overcome the defects that high cost, low reliability and low over loading that current idle work power and harmonic wave compensating device adopts the power semiconductor element, at the same time the defect that harmonic wave current can be generated by using transformer and the electric network power factor is decreased and one time side and secondary side harmonic wave can not be separated can be overcome. It includes wire wrapping type rotor induction machine, power converter, clutch and priming mover, the wire wrapping type rotor induction machine includes NO.1 stator winding, NO.2 stator winding and rotor winding, the rotor of the wire wrapping type rotor induction machine is coaxially connected with priming mover via clutch, the three phase end of the output of the NO.2 stator winding or the three phase end of the input of the NO.1 stator winding are separately connected with the three phase end of power input end of the power converter, the three phase end of power output end of the power converter is separately connected with the three phase end of input end of the rotor winding.

Description

technical field [0001] The invention relates to an electromagnetic energy conversion device, which belongs to the technical field of motors and power electronics. Background technique [0002] With the increasingly widespread application of power electronic devices, the harmonic pollution in the power grid is also becoming more and more serious. In addition, the power factor of many power electronic devices is very low, which also brings additional burden to the grid and affects the quality of power supply. Therefore, eliminating harmonic pollution and improving power factor has become a major issue in power electronics technology. [0003] A typical device for compensating reactive power is a static var compensator SVC. In order to compensate the reactive power of 0-100% capacity variation, the SVC device almost needs a capacitor with 100% capacity and a thyristor-controlled reactor with more than 100% capacity, and consumes a lot of copper and iron. In terms of technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/38
CPCY02E40/30Y02E40/40
Inventor 寇宝泉李立毅
Owner HARBIN INST OF TECH