Dynamic voltage restorer

Abstract

The invention discloses a dynamic voltage restorer, which comprises a secondary loop control switch, a signal collector, a switching power supply, a controller, a power module, a filter loop, a super capacitor, a grounding bus bar, a cabinet body, an incoming line loop, an operation button, a liquid crystal touch screen, a power utilization system, an inverse parallel silicon controlled rectifier, an H-bridge inverter, a load, a direct-current chopped-wave boost circuit, an electronic switch and a release resistor. The secondary loop control switch, the signal collector, the switching power supply, the controller, the power module, the filter loop, the super capacitor, the grounding bus bar and the incoming line loop are arranged in the cabinet body. A cabinet door is arranged on the cabinet body. The operation button and the liquid crystal touch screen are arranged on the cabinet door. The controller and the reverse parallel silicon controlled rectifier are connected between the power utilization system and the load. The H-bridge inverter is connected between the two ends of the reverse parallel silicon controlled rectifier. The H-bridge inverter is connected with the direct-current chopped-wave boost circuit. The direct-current chopped-wave boost circuit is connected with the super capacitor. The cabinet door is provided with a fingerprint unlocking device and a wireless communication unit.

Description

technical field [0001] The invention relates to the technical field of electric equipment, in particular to a dynamic voltage restorer. Background technique [0002] At present, the frequency conversion speed regulation system of most power plants controls the speed of the frequency converter by outputting 4~20mA signal through DCS or console. The start, stop, fault and 1C / 2C power supply signals of the inverter are sent back to FSSS, and FSSS uses these signals to judge the logic of powder feeding full stop and trigger MFT action. The power distribution cabinet of the system mostly adopts 1C / 2C power supply respectively, and 3C standby self-switching switching mode. When there is MFT action, the large interlocking is used to cut off the powder frequency conversion 1C / 2C power supply. The biggest problem of this speed control system is the poor anti-shaking ability. [0003] 1. The control circuit is designed to be installed in the inverter cabinet for the system that reli...

AI Technical Summary

Problems solved by technology

The biggest problem with this speed control system is its poor anti-shaking ability.

[0003] 1. The speed control system is controlled by the operating console. The control circuit is designed and installed in the inverter cabinet. When the factory power is swaying, the control circuit loses power and cannot achieve the purpose of speed control.

Some DCS signal inputs require voltage-current signal conversion. This conversion module is also set in the frequency conversion cabinet. When the power grid shakes, these signals cannot be sent to the DCS.

2. The inverter itself has poor anti-shaking ability

3. The ability of 1C / 2C contactors to resist swaying electricity is poor. Many power plants have the problem that the contactor trips first when the swaying electricity occurs, but this is a superficial problem. Even if the contactor does not trip, the inverter will trip due to instantaneous power loss.

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