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Three-phase alternating-current phase-change switch and phase-change control method

A commutation switch and three-phase AC 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., and can solve the problems of low voltage at the end of the power supply line, unbalanced load, and increased power loss. , to achieve the effect of ensuring the reliability of power supply, fast commutation, and overcoming the long commutation time

Inactive Publication Date: 2021-03-26
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the uncontrollable increase of the load in the low-voltage distribution area, the load balance on the three phases is broken, and the problem of load imbalance in the low-voltage distribution area becomes more and more serious. The unbalanced load brings not only the increase of power loss, but also More of a low voltage problem at the end of the supply line

Method used

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  • Three-phase alternating-current phase-change switch and phase-change control method
  • Three-phase alternating-current phase-change switch and phase-change control method
  • Three-phase alternating-current phase-change switch and phase-change control method

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Embodiment 1

[0029] This embodiment introduces a three-phase AC commutation switch, refer to figure 1 As shown, the three-phase AC phase commutation switch includes: a controller, and controllable branches corresponding to the three phases A, B, and C, and one end of each controllable branch is connected to the AC phase A, B, and C phases respectively. , the other end is the connection end of the live wire of the load; each controllable branch circuit includes a controllable switch assembly and a controllable contactor, and the controllable switch assembly is connected in series in the controllable branch circuit and connected in parallel with the controllable contactor ; The control input ends of each controllable switch assembly and the controllable contactor are respectively electrically connected to the controller.

[0030] In application, by controlling the on-off combination of each controllable switch component and controllable contactor through the controller, the load can be conne...

Embodiment 2

[0033] Based on the same inventive concept as Embodiment 1, this embodiment introduces a commutation control method for a three-phase AC commutation switch, which is executed by a controller. The method includes:

[0034] S1. Receive a commutation command, where the commutation command includes original conduction phase-specific information and target phase-specific information;

[0035] S2, control the controllable switch component on the controllable branch corresponding to the original conduction phase to unlock and conduct, and control the controllable contactor on the controllable branch to open after the controllable switch component is turned on;

[0036] S3. Detect the phase-line voltage corresponding to the original conduction phase. After the controllable contactor on the controllable branch corresponding to the original conduction phase is opened, in response to the zero-crossing point of the phase-line voltage of the original conduction phase. At the zero-crossing ...

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Abstract

The invention discloses a three-phase alternating-current phase-change switch, a phase-change control method and a phase-change control method. The three-phase alternating-current phase-change switchcomprises a controller and controllable branches arranged corresponding to A, B and C phases, wherein one end of each controllable branch is correspondingly connected with an alternating-current A-phase line, a B-phase line and a C-phase line, and the other end of each controllable branch is a load live wire connecting end; each controllable branch comprises a controllable switch assembly and a controllable contactor, and the controllable switch assemblies are connected in series in the controllable branches and are connected in parallel with the controllable contactors; and the controllable switch assemblies and the control input ends of the controllable contactors are electrically connected with the controller. During application, on-off combination of the controllable switch assembliesand the controllable contactors is controlled through the controller, so that a load can be accessed to a corresponding alternating current phase line from the load connecting end through different controllable branches. The three-phase alternating-current phase-change switch can be used for realizing commutation when the three-phase load is unbalanced, the commutation time is reduced, and the power supply reliability of the user load is ensured.

Description

technical field [0001] The invention relates to the technical field of DCDC power electronic switch topology and control of a low-voltage direct current distribution network, in particular to a hybrid three-phase AC commutation switch and a commutation control method. Background technique [0002] In recent years, with the rapid popularization and use of electrical appliances such as air conditioners, refrigerators, and induction cookers, the load in the low-voltage distribution station area has been rapidly increased. Most of the loads in the low-voltage distribution area are single-phase loads, and the grid planning begins with evenly distributing the single-phase loads to the three phases A, B, and C. However, due to the uncontrollable increase of the load in the low-voltage distribution area, the load balance on the three phases is broken, and the problem of load imbalance in the low-voltage distribution area becomes more and more serious. The unbalanced load not only br...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 张宸宇杨景刚史明明袁宇波葛雪峰缪惠宇姜云龙
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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