Automatic switching method of intelligent inter-station remote backup power supply

Abstract

The invention relates to an automatic switching method of an intelligent inter-station remote backup power supply, which comprises the following steps that: a transformer substation is selected; the power grid of the transformer substation only has a circuit of direct main power supply; another indirect power supply of the power grid is in a heat standby state because the operation method of the power grid is required to be set into a ring breakage point of an electromagnetic ring network, and the ring breakage point is arranged in a to-end transformer substation; and a standby power supply automatic switching function is integrated in an automatic control system of a regional power grid centralized control station, information related to voltage, current and the state quantity of a circuit breaker is acquired from a partition layer network of a remote intelligent transformer substation which meets a DL_T_860 communication protocol, and an inter-station communication channel and an optical fiber channel for realizing the functions of a centralized control station are shared. The automatic switching method of the intelligent inter-station remote backup power supply has the beneficial effects that: when a power system cannot realize the automatic switching function of the standby power supply in the transformer substation in a region with a weak power grid architecture, the inter-station remote standby power supply automatic switching function is realized by remote communication, so that the power supply reliability of the transformer substation in the region with the weak power grid architecture is improved and power grid accidents are prevented from happening.

Description

technical field [0001] The invention relates to a smart grid and a method for automatic switching of remote standby power between intelligent stations in the field of automatic control of electric power systems. Background technique [0002] At present, in the field of power system, due to the limitation of regional economic development and topographical factors, there are still quite a few substations (including 220kV voltage level substations) whose main power supply is single-line series connection power supply or double-circuit lines of the same power supply paralleled on the same pole. In the case of power supply, once the main power supply disappears, the capacity of the micro-power sources such as small hydropower connected to this station is far less than the supplied load, and it will face the danger of losing all loads. According to the division of power grid accident levels, a power grid with a load of more than 150MW and a power grid with a load reduction of more...

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Problems solved by technology

Therefore, in the above-mentioned weak power grid areas, the main power supply disappears due to various natural or human factors caused by permanent faults of single-line power supply lines, permanent faults of double-circuit lines crossing lines at the same position, etc., often causing major power grid accidents

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