FCB operation method applied to gas-steam set power plant

Abstract

The invention discloses an FCB operation method applied to a gas-steam set power plant. The method comprises: S1, a gas set and a steam set are set according to FCB operation requirements; S2, when afault occurs, a safety and stability control device issues a switching instruction to enter a FCB operating state; S3, a gas turbine enters the FCB operating state after receiving an FCB starting signal and the steam set enters the FCB operating state after receiving the FCB starting signal; and S4, after elimination of a grid fault, isolated island operation is implemented and then grid connection is carried out again. According to the method disclosed by the invention, when a fault occurs at an external grid, the power plant set is able to abandon all externally power supply loads instantaneously and disconnect the external grid, the steam set performs the coasting operation and keeps a vacuum state, and the gas turbine does not stop working, thereby keeping auxiliary power supply of thepower plant; and after grid fault elimination, the set carries the plant electric load and is connected with the external grid quickly and effectively to provide power for the system, so that other sets in the grid are activated rapidly and thus power is provided for the users again.

Description

technical field [0001] The invention relates to the field of power generation, in particular to an FCB operating method applied to a gas-steam unit power plant. Background technique [0002] In recent years, with the rapid development of the national economy, the society's demand for electricity is increasing. The power grid is becoming larger and larger, and the security of the power grid is also being severely tested. All over the world, including the United States, Canada, the United Kingdom, Russia, Italy and other power developed countries, there have been many large-scale power outages. These incidents have resulted in partial or isolated grid failures and total power plant blackouts. When the unit of a power plant encounters a power grid accident, the parameters of the unit will change drastically. Due to the disappearance of plant power, the unit equipment may be out of control, and it is easy to expand the accident and cause equipment damage. At the same time, wh...

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Problems solved by technology

[0003] FCB (Fast Cut Back, fast load shedding) refers to the fact that when the unit is in normal operation, due to the failure of the external power grid, it is disconnected from the power grid, and all the external power supply load is instantly shed, but the generator set is not shut down. Group operation, with the automatic control function of factory power, also known as island operation, and the main power plants in China are coal-fired power plants. The function is difficult to implement due to the complexity of the system, and the reliability is also low; some power plants consider using gas units and steam units to realize the FCB function, and currently there is a lack of a method to realize FCB operation in the power plant of gas units and steam units

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