A method for running-down simultaneous grid connection of large synchronous camera group

Abstract

The invention discloses a large synchronous camera group running-down simultaneous connection method. The method comprises the following steps: a SFC device is used to drag the camera group; when therotational speed of the camera group is accelerated to 1.05 times of the rated rotational speed, the SFC device exits, and the excitation system boosts voltage; The adjuster set is subjected to mechanical friction, the effect of no-load loss and excitation loss of main transformer, As that rotate speed decreases gradually, the monitor system sends a synchronization instruction to the synchronization device after detecting that the terminal voltage rise to the set value, and the synchronization device detects the voltage on the waiting side and the grid side for real-time calculation, capturesthe connection opportunity in the idle process of the unit, and sends out the connection circuit breaker closing instruction when the synchronization condition is judged to be met; After detecting theswitching-on signal of the grid-connected circuit breaker, the synchronous device feeds back the synchronous success signal of the monitoring system, and the grid-connected success is achieved at thesame time. The invention can realize fast and reliable grid connection of the synchronous camera group, and has guiding significance for the synchronous grid connection of other similar idle-type equipments.

Description

technical field [0001] The invention relates to a grid-connection method for a large-scale synchronous phase-adjusting unit with idle rotation and synchronous grid connection, and belongs to the technical field of grid motor control. Background technique [0002] The synchronous condenser is essentially a synchronous motor without mechanical load, which absorbs a small amount of active power from the system to compensate the loss of the motor itself, and always operates close to zero electromagnetic power and zero power factor. As a reactive power compensation device, by adjusting the excitation current, it sends or absorbs reactive power to the power system, thereby maintaining the voltage level of the power grid, and significantly improving the reliability, economy and power supply quality of the power system. [0003] The start-up of large-scale condensers adopts SFC frequency conversion in consideration of economy, technological advancement and flexibility. Unlike the p...

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Problems solved by technology

[0004] During the synchronous grid connection of conventional synchronous generators or pumped storage units, the prime mover and excitation system can be adjusted according to the needs of grid connection to adjust the frequency and voltage of the side to be paralleled. The parallel side voltage cannot control its frequency, let alone the phase, which greatly increases the difficulty of grid connection, especially the setting of the parameters of the synchronous device. There is an urgent need for a reliable and convenient synchronous grid connection under the condition of unit idling. method

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