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Rapid solid-state change-over switch control strategy and system

A technology of solid-state switch and solid-state switch, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of not considering the switching strategy of the switch, long switching time, and insufficient IGBT withstand voltage, etc., to achieve high quality and short voltage Time-out management, high-quality voltage sag, and shortened switching time

Pending Publication Date: 2021-03-30
XIAN ACTIONPOWER ELECTRIC
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Problems solved by technology

[0004] Chinese patent application number 201811480624.2 proposes a hybrid dual-power transfer switch system structure, which is mainly composed of an isolating switch, a circuit breaker, and a thyristor. Three different structural forms are proposed, mainly aimed at reducing system costs, and There is no technology proposed to improve the switching time index of the system to realize electrical breaking, and the switching time is relatively long, and it is mainly used in occasions that require low switching time
The solid-state switching switch with this structure is good in principle and technical realization, but the cost is too high, and the withstand voltage of IGBT single tube is not enough, so it is necessary to solve the withstand voltage problem of IGBT series connection
[0008] Most of the above solid-state switches are explained from the system composition and electrical structure of the solid-state switch, without considering the switching strategy of the switch, and improving the safety and stability of the system and the optimization of the switching time by optimizing the switching strategy

Method used

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  • Rapid solid-state change-over switch control strategy and system

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Embodiment Construction

[0048] The electrical structure of the solid-state transfer switch system includes: the solid-state transfer switch system is connected to the main power supply and the backup power supply in a symmetrical structure, and the middle of the symmetrical structure is used to connect the load to realize the voltage dip or short-term interruption of the main backup power supply. , Fast switching between dual power supplies, mechanical switches connected in series with the front stage and rear stage of the solid state switch unit, solid state switch unit, bypass switch, detection and control unit in parallel with the solid state switch unit and the mechanical switch in series with the front and rear stages;

[0049] A mechanical switch connected in series with a solid-state switch. The mechanical switch can be two three-phase mechanical switches or six single-phase mechanical switches. If it is a three-phase mechanical switch, each three-phase switch is connected in series to the front...

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Abstract

According to a rapid solid-state change-over switch control strategy and system provided by the invention, when the problems of voltage drop, voltage fluctuation, instantaneous power failure and the like occur, a main power supply and a standby power supply can be rapidly switched in time, huge losses brought to production and life of power consumers due to abnormal work of sensitive devices are avoided, and under the premise of safe system operation, the switching time is shortened, and the higher-quality voltage sag and voltage short-time interruption treatment are realized.

Description

technical field [0001] The invention relates to the technical field of high-quality power supply of power electronics, in particular to a control strategy and system of a fast solid state switch. Background technique [0002] In the medium and low voltage power distribution system, especially the industrial power supply system with high power supply quality requirements, due to thunderstorms, winds and human factors, the power supply system has voltage sags, short-term interruptions and other power supply quality problems still prevail. With the transformation and upgrading of my country's industry, the industrial form of low-end production and processing has been transformed and upgraded to high-value-added, high-tech industries. Production and processing have high requirements for power supply quality, and unqualified power supply quality will cause serious economic losses. In addition, industrial and mining enterprises such as iron and steel smelting, military industry, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
CPCH02J3/0073
Inventor 白士贤高鹏张均华王启华
Owner XIAN ACTIONPOWER ELECTRIC
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