Power supply switching method and system for medium-voltage AC system of nuclear power ship

Abstract

The invention discloses a power supply switching method and system for a medium-voltage AC system of a nuclear power ship, which are applicable to a medium voltage AC system of a nuclear power ship. The system includes at least two power supplying buses and at least two power receiving buses. The method comprises the following steps: S1, detecting a power loss bus among the power receiving buses,and judging whether the reason for power loss of the power loss bus is planned power failure or fault power loss; and S2, in the case of fault power loss, selecting a power supply fast switching modeor synchronous switching mode or slow switching mode according to the comparison result between the voltage states of the power loss bus and a normal power receiving bus and a preset priority to enable the power loss bus to be powered by a power supplying bus corresponding to the normal power receiving bus. A method combining power supply fast switching, synchronous switching and slow switching isadopted. By comparing the voltage amplitudes, working frequencies and phase angles of the power loss bus and the normal power receiving bus and selecting a switching mode according to the priority, the influence range of power supply switching can be minimized.

Description

technical field [0001] The invention relates to the field of electrical technology in ships with a nuclear power system, in particular to a power switching method and system for a medium-voltage AC system of a nuclear power ship. Background technique [0002] The prior art discloses a fast switching system (CN 202535048). The main technical content of this patent is that the fast switching system with a controller and a protection action module is used to disconnect the two bus sections of the system, each incoming line circuit breaker, and the bus tie. Connectors and transformers. In a short time, the normal power supply of the two busbars can be restored to ensure that the high-voltage motor that loses power in an instant can be powered on quickly to resume operation without completely stopping the operation. [0003] But it has the following disadvantages: [0004] 1) When the power-off bus voltage drops to 20% to 40% of the rated voltage, the fast switching system has ...

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Problems solved by technology

[0004] 1) When the power-off bus voltage drops to 20% to 40% of the rated voltage, the fast switching system has a large impact on the reliability of the internal power supply network due to the downstream motor self-starting and feeding back a large current, so it is not suitable for internal power supply of ships switch;

[0005] 2) When the switching system is connected to an infinite power grid at the power generation end, the impact on the power grid during the switching process is negligible; crash the whole microgrid

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