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Current conversion method and device of controllable reactor

A technology of converter devices and reactors, which is applied in the direction of output power conversion devices, harmonic reduction devices, and conversion equipment that can be converted to DC without intermediate conversion. It can solve the problem of voltage spikes damaging switching devices and increasing the current of switching devices. Stress, increased loss and other issues, to achieve the effect of small loss, simple control and high reliability

Pending Publication Date: 2020-04-14
BEIJING SHENGFEIFAN ELECTRONIC SYST TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But on the one hand, it is necessary to accurately detect the zero-crossing point of the current, otherwise a huge voltage spike will be caused at the moment the switch is turned off, which will damage the switching device; on the other hand, when the switch is turned on, the inductor current will form a circulating current with the parallel switch, increasing the current of the switching device stress and increase losses

Method used

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  • Current conversion method and device of controllable reactor
  • Current conversion method and device of controllable reactor
  • Current conversion method and device of controllable reactor

Examples

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Embodiment 1

[0031] The first embodiment of the present invention provides a method for commutating a controllable reactor, and the method includes the following steps:

[0032] Obtain the switching command of the inductor and the current magnitude of the current;

[0033] The switching device of the controllable reactor is controlled to be turned off or turned on in response to the switching instruction according to the zero-crossing point of the current current.

[0034] Specifically, in this embodiment, a group of controllable reactance modules connected in parallel with bidirectional switches and inductors is used as an example, and the commutation method of multiple controllable reactance modules can be deduced by analogy, such as figure 2 As shown, two full-control switching devices IGBT, IGCT or MOSFET are used in reverse series as a bidirectional switch, and each switching device S1 and S2 includes an anti-parallel diode D1 and D2 respectively. When the switches S1 and S2 are tur...

Embodiment 2

[0068] The second embodiment of the present invention provides a method for commutating a controllable reactor, and the method includes the following steps:

[0069] Obtain the switching command of the inductor and the current magnitude of the current;

[0070] The switching device of the controllable reactor is controlled to be turned off or turned on in response to the switching instruction according to the zero-crossing point of the current current.

[0071] Specifically, in this embodiment, a group of controllable reactance modules connected in parallel with bidirectional switches and inductors is used as an example, and the commutation method of multiple controllable reactance modules can be deduced by analogy, such as figure 2 As shown, two full-control switching devices IGBT, IGCT or MOSFET are used in reverse series as a bidirectional switch, and each switching device S1 and S2 includes an anti-parallel diode D1 and D2 respectively. When the switches S1 and S2 are tu...

Embodiment 3

[0090] The third embodiment of the present invention provides a converter device for a controllable reactor, the device includes:

[0091] The command receiving module is used to obtain the switching command of the inductor;

[0092] The current sampling module is used to obtain the current current magnitude;

[0093] The switch control module is used to control the switching device of the controllable reactor to turn off or turn on in response to the switching instruction according to the zero-crossing point of the current current.

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Abstract

The invention discloses a commutation method and device of a controllable reactor. The method comprises the following steps: obtaining a switching instruction of an inductor and the current magnitude;and responding to the switching instruction according to the zero crossing point of the current so as to control the switching device of the controllable reactor to be turned off or turned on. According to the embodiment of the invention, the switching instruction is responded according to the zero crossing point of the current so as to control the switching device of the controllable reactor tobe switched off or switched on, the zero-current natural switching-off and approximate zero-current switching-on of the bidirectional switch are realized, and the method has the outstanding advantagesof simple control, low loss, high reliability and the like.

Description

technical field [0001] The invention relates to the field of power electronics technology, in particular to a commutation method and device for a controllable reactor. Background technique [0002] The controllable reactor with two-way switching switching inductance has broad application prospects in the fields of power system filtering, reactive power compensation, and long-wave communication tuning. One of its structures is figure 1 As shown, a group of bidirectional switches and inductors are connected in parallel as a controllable inductance module, and multiple controllable inductance modules with different inductance values ​​are connected in series to realize rapid and accurate controllability of the total reactance. One of the control difficulties of the controllable reactor is how to realize fast and reliable switching of the inductance of each controllable inductance module. Since the inductor current cannot be disconnected, the most direct method is to detect th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/13H02P13/00H02J3/01H02J3/18
CPCH03K17/13H02P13/00H02J3/01H02J3/18Y02E40/30Y02E40/40
Inventor 王奎贾琦刘少刚
Owner BEIJING SHENGFEIFAN ELECTRONIC SYST TECH DEV CO LTD
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