Reactive power compensation device

Abstract

The invention discloses a reactive power compensation device, and relates to the field of reactive power compensation. The reactive power compensation device comprises a controller, a synchronizing signal detection circuit, a thyristor, a non-power consumption switch, a capacitor, a magnetic latching relay, a close shutoff detection circuit and a reactor; the controller is connected with the synchronizing signal detection circuit, the thyristor, the non-power consumption switch, the magnetic latching relay and the close shutoff detection circuit; the thyristor is in a parallel connection withthe non-power consumption switch; the thyristor is connected with the capacitor through the reactor; the magnetic latching relay is connected with the thyristor; and according to the synchronizing signal detected by the synchronizing signal detection circuit and the close or shutoff time of the magnetic latching relay detected by the lose shutoff detection circuit, the controller acquires a comparative result and rectifies the drive time of the magnetic latching relay according to the comparative result. The reactive power compensation device provided by the invention can effectively restrainthe high frequency flow and the overvoltage; when the device runs for a long time, the capacitor can be connected at the passing zero time of the voltage or disconnected at the passing zero time of the current; and thus, the service life of the magnetic latching relay and the capacitor is prolonged.

Description

technical field [0001] The invention relates to the field of reactive power compensation, in particular to a reactive power compensation device. Background technique [0002] Reactive power often exists in the low-voltage distribution network. Reactive power reduces the user power factor, increases line and equipment losses, and reduces user voltage; increases the total current, which increases the capacity of components in the power system and increases investment; increases the voltage loss of lines and transformers. Therefore, it is of great significance to improve the power factor of the power grid and improve the quality of power grid operation. The application of reactive power compensation technology in power grid is more and more extensive. [0003] Existing reactive power compensation devices have been tested for zero-crossing switching before leaving the factory to achieve zero-crossing switching and ensure that there is no high-frequency inrush current and overv...

AI Technical Summary

Problems solved by technology

[0003] Existing reactive power compensation devices have been tested for zero-crossing switching before leaving the factory to achieve zero-crossing switching and ensure that there is no high-frequency inrush current and overvoltage during the switching process. Most of the methods are based on the operating environment before leaving the factory. The closing time of the holding relay coincides with the zero-crossing point of the grid voltage and the closing time coincides with the zero-crossing point of the capacitor current. After leaving the factory and applying it to the field, zero-crossing switching correction will no longer be performed, but the closing time and turning-off time of the magnetic latching relay are related to the drive voltage , grid voltage, grid frequency, temperature and the magnetic latching relay itself are all related. In different operating environments, the closing time and closing time of the magnetic latching relay will deviate, and high-frequency inrush current or overvoltage will occur during the switching process. Affect the service life of magnetic latching relays and capacitors

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