Automatic starting controller, power plant automatic starting control system and control method thereof

Abstract

The invention discloses an automatic starting controller, a power plant automatic starting control system and a control method thereof. The automatic starting controller comprises a unit starting condition judgment module which is used for judging whether a unit meets a starting condition to carry out automatic starting control on the unit, an auxiliary system starting module which is used for carrying out starting control on an auxiliary system which assists a host machine system to start, a starting mode judgment module which is used for selecting the unit starting mode of the automatic starting controller according to the information sent by the host machine system as feedback, a starting module which is used for calling the starting sub modules of the unit to carry out starting control according to the selected unit starting mode, and an ending module which is used for ending the control of the automatic starting controller after the unit is started successfully and a load is raised to a target load. A mode of building blocks is employed to flexibly call each host machine starting sub module, and thus the automatic and efficient starting of the whole set of unit in different working conditions is realized.

Description

technical field [0001] The invention relates to an automatic start controller, a power plant automatic start control system and a control method thereof, and is mainly applied to a gas-steam combined cycle power plant. Background technique [0002] Since the 1980s, the stand-alone power and thermal efficiency of gas turbines have been greatly improved, especially the gas-steam combined cycle technology is becoming more and more perfect, coupled with the further development of natural gas resources worldwide, making gas-- Steam combined cycle power plants have developed rapidly, and the position of gas-steam combined cycle in the world power industry has also undergone significant changes. At present, about 1 / 3 of the newly installed capacity in the world each year uses gas-steam combined cycle units; Large-scale applications, especially in recent years, in order to optimize the energy structure and improve environmental pollution, the country has built a number of large-scal...

AI Technical Summary

Problems solved by technology

[0004] At present, although the combined cycle power plants in China all adopt DCS (distributed control system) to control the units, the DCS program control of most combined cycle power plants still only stays in the four-layer program control structure (from the lower layer to the upper layer: equipment level → (subgroup level → functional group level → unit level) at the subgroup level, the start-up automation of the whole plant is generally not high. The manual operation is completed by personnel on the HMI station (human-machine interface station). The disadvantages brought by this operation mode are: with the increase of combined cycle unit capacity and the increase of control equipment, the complexity of control and the intensity of operation It is also getting bigger and bigger, and it is difficult to avoid mistakes in a large number of human operations; it is difficult to guarantee the start-up boundary conditions of the unit, such as the pressure increase rate of the waste heat boiler drum, the temperature increase rate of the steam turbine, and the load increase rate. Ensure that the limit is not exceeded, which speeds up the life loss of the unit; the analog control loop of the unit is not effective, especially the drum water level control and steam bypass control are difficult to achieve full automation during the start-up process, which increases the risk of tripping the unit, such as Improper automatic adjustment of the steam drum water level caused the water level to exceed the limit, resulting in tripping; the unit’s start-up time is too long, which reduces the economic efficiency

Images