Synchronous condenser start-up grid-connected circuit and control method based on pre-connected large impedance

Abstract

The invention discloses a preaccess high impedance-based synchronous condenser starting grid-connected circuit and a control circuit. The circuit comprises a synchronous condenser, a machine-end mainAC circuit breaker, an AC three-phase transformer, a power grid and a preaccess circuit, wherein the preaccess circuit comprises a preaccess AC circuit breaker, a preaccess resistor and a preaccess inductor which are sequentially connected, wherein an AC outlet end of the synchronous condenser is connected with the machine-end main AC circuit breaker; the other side of the machine-end main AC circuit breaker is connected with the AC three-phase transformer; the other side of the AC three-phase transformer is connected with the AC power grid; and the preaccess circuit is connected with the machine-end main AC circuit breaker in parallel. According to the preaccess high impedance-based synchronous condenser starting grid-connected circuit, impulse voltage and permanent magnet current generated in the starting process are reduced, and smooth starting and grid-connection of the synchronous condenser are achieved.

Description

technical field [0001] The invention belongs to the start-up control technology of a synchronous condenser, in particular to a start-up grid-connected circuit and a control method for a synchronous condenser based on pre-connected large impedance. Background technique [0002] The synchronous condenser can provide reactive power compensation to the grid, and has high application value in the field of high-voltage direct current transmission. The synchronous condenser is a rotating motor. Its operation and maintenance are more complicated than static var compensation equipment. It is likely that there will be a large excitation inrush current and surge voltage during the start-up process of grid connection. If the start-up control method is improper, it will cause an impact on the power grid. Therefore, it is meaningful to design a suitable start-up grid-connection circuit and an effective timing start-up grid-connection control method for synchronous condensers. [0003] Ai...

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