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Commutation device, system and method

A phase-commutation circuit and phase-shifting technology, which is applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc., can solve the influence of low-voltage leakage, damage the phase-changing equipment or load equipment, and last for a long time and other problems, to achieve the effect of high output power quality, long service life and good stability

Pending Publication Date: 2019-06-04
STATE GRID HUNAN ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the change of time, the number of household appliances will continue to increase. When the new load is connected to the power grid, the negligent wiring of the power supply company will cause uneven load distribution. Factors such as inconsistencies in time periods and other factors will cause unbalanced three-phase loads on low-voltage distribution lines
If the three-phase imbalance of the load is very serious and lasts for a long time, it will have many adverse effects on the power grid and its equipment. The typical situation is that the power loss of distribution transformers and transmission lines increases, and the output of distribution transformers decreases. The normal operation of low-voltage leakage appliances is affected
[0003] Although the existing intelligent phase commutation device can automatically switch the load to the phase with the highest voltage, in the prior art, the phase commutation is realized directly through on-off control, such as figure 1 As shown, there are still problems such as large current during commutation, possible arcing, possible damage to commutation equipment or load equipment, and short-term interruption of electric energy during commutation, which is not smooth enough, and the power quality during commutation is not high.

Method used

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  • Commutation device, system and method
  • Commutation device, system and method
  • Commutation device, system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment one: if figure 2 As shown, the phase commutation device of this embodiment: includes a controller and a phase shifting circuit; the input terminal of the phase shifting circuit is used as the input terminal of the phase commutating device; the output terminals of the phase shifting circuit are connected in parallel , as the output terminal of the phase-shifting device; the phase-shifting and phase-changing circuit includes a first switch K1 and a phase adjustment unit connected in series in sequence, and the phase adjustment unit is used to phase-shift the phase-shifting and phase-changing circuit; The controller is signal-connected to the phase adjustment unit, and is used to control the phase-adjustment unit to shift the phase of the phase-shifting circuit; the controller is signal-connected to the first switch K1, and is used to control the On and off of the first switch K1.

[0041] In this embodiment, the phase-shifting and commutating circuit further ...

Embodiment 2

[0055] Embodiment 2: This embodiment is basically the same as Embodiment 1, and also includes a controller and a phase-shifting and commutating circuit, and the difference also includes a phase-fixed and phase-commutating circuit. The phase commutation device of this embodiment also includes a phase-fixed phase-commutation circuit, the input terminal of the phase-fixed phase-commutation circuit is used as the input terminal of the phase-commutation device, and the output terminal of the phase-fixed phase-commutation circuit is connected to the phase-shifting commutation circuit The output terminals of the phase circuit are connected in parallel; the phase-setting and commutation circuit includes a second switch K4 connected in series between the input terminal and the output terminal; the controller is also connected with the second switch K4 for controlling the On and off of the second switch K4. like image 3 As shown, phase A and phase B of the commutation device are phase...

Embodiment 3

[0058] Embodiment 3: This embodiment is basically the same as Embodiment 1, except that the controller of the phase commutation device also includes a memory for storing the preset original phase value. The controller of the commutation device may not include a voltage sampling unit. The phase commutation system of this embodiment is the same as that of Embodiment 1, and the phase commutation method is basically the same as that of Embodiment 1, except that in step S1, according to the preset original phase value of the original phase and the target phase The preset original phase value determines the phase shift angle; the phase shift angle is adjusted individually by the phase adjustment unit of the original phase, or the phase shift angle is individually adjusted by the phase adjustment unit of the target phase, or the phase shift angle is adjusted by the phase adjustment unit of the target phase The phase adjustment unit of the original phase and the phase adjustment unit ...

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Abstract

The invention discloses a commutation device, a commutation system and a commutation method. The commutation device comprises a controller and phase-shifting and commutation circuits, wherein input ends of the phase-shifting and commutation circuit serve as an input end of the commutation device; output ends of the phase-shifting and commutation circuit are connected in parallel and serve as an output end of the commutation device; each phase-shifting and commutation circuit comprises a first switch and a phase adjusting unit which are sequentially connected in series, and the phase adjustingunit is used for performing phase shifting on the phase-shifting and commutation circuit; the controller is in signal connection with the phase adjusting units, and is used for controlling the phase adjusting units to perform phase shifting on the phase-shifting and commutation circuits; and the controller is in signal connection with the first switches, and is used for controlling the on and offof the first switches. The commutation device, the commutation system and the commutation method have the advantages of avoiding electric energy interruption in commutation, being capable of realizingseamless commutation, providing stable and high-quality electric energy for the load during commutation, and being good in stability, good in safety and the like.

Description

technical field [0001] The present invention relates to the technical field of multi-phase power supply, in particular to a phase commutation device, system and method. Background technique [0002] Most of my country's low-voltage distribution network adopts a three-phase four-wire system for power supply, that is, the distribution network supplies power to the majority of residents in the form of a three-phase four-wire system after being stepped down by a 10 / 0.4kV transformer. The three-phase balance of distribution line load is the basic guarantee factor for the safe operation of the power grid, energy saving and loss reduction, and the prevention of personal electric shock. Residents' electrical appliances are generally single-phase loads, so the power supply company will connect the residents' loads to the grid. The load is evenly connected to the three phases A, B, and C, so that the three-phase load balance can be realized on the power supply line. With the change o...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 岳万里曾军李勤张维刚张力郭云向红阳
Owner STATE GRID HUNAN ELECTRIC POWER