Upgrading method of gas turbine control system

Abstract

The invention discloses an upgrading method of a gas turbine control system. The upgrading method comprises the steps that the integrated gas turbine control system is introduced, control software isunified and centralized in a controller, and one set of PLC control system is used for achieving all control functions; brand-new control logic is used for controlling a gas turbine; the complex gas turbine control system is divided into multiple independent modules, and mode control is achieved according to the work condition state stepping sequence; multiple kinds of control algorithms are introduced into the control logic to optimize the gas turbine control system; and multiple independent modular command algorithms cover all states of a turbine generator set, and control of each equipmentadjusting component is expressed through a module equation. The existing gas turbine control system is modified and upgraded, the modular stepping process control logic and the advanced control algorithms are adopted for achieving the processes of starting, running and fuel switching control of the gas turbine, and meanwhile precise control of the process of fuel switching control is guaranteed.

Description

technical field [0001] The invention relates to an upgrading method of a gas turbine control system. Background technique [0002] The gas turbine control system is the nervous system of the power station to ensure the safe and reliable operation of the unit. In addition to being equipped with advanced host equipment, the perfect regulation and control system can give full play to the greatest advantages of the gas turbine, and the gas turbine starts, runs, stops and protects The control has the characteristics of different and general variable working conditions, and is an important part of the gas turbine control system. Its characteristics are of great significance for improving the service life of the gas turbine; the overall requirements of the gas turbine control system: the gas turbine control system makes the gas turbine from stationary to cranking, Drive the turbine to the cleaning speed, which is about 20% of the rated speed, and then ignite. When the turbine speed...

AI Technical Summary

Problems solved by technology

[0003] At this stage, the domestic gas turbine control system is outdated and backward in technology, relevant technical information is missing, and system spare parts are out of production, which is not conducive to independent maintenance. The main controller of the current control system is PLC5, which has been discontinued by Rockwell in the United States. The controller needs to be updated, and the load distribution system adopts the independent equipment of the backward analog control mode. The control command of the excitation system uses the old stepping motor and the mechanical adjustment mechanism of the sliding resistor, which has poor accuracy and reliability, which is not conducive to The integration of EMS system, there are many self-made informal products in the control panel, the supply of spare parts is monopolized, and maintenance is difficult. The fuel servo adjustment system adopts the form of "black box controller→CEC→ECU→actuator→regulating valve opening", It is difficult to verify the zero point and full scale of the actuator, and the control signal is not the standard signal of the instrument and meter specified by IEC, which is not convenient for maintenance and testing. The IGV actuator is a strong current control electro-hydraulic servo structure, and the product has non-standard control signals, so it is not easy to find replacement parts

The gas turbine control system was developed in the 1970s. After many years of operation, factors such as system aging, spare parts aging and outage, and equipment need to be upgraded have gradually occurred. Faced with the situation that the gas turbine control system has to be upgraded, although foreign manufacturers have introduced relatively advanced gas turbine control systems , but has implemented a high degree of protection for its own technology. If a new gas turbine control system is introduced from abroad, once there is a problem with the gas turbine control system, it must wait for the manufacturer to carry out on-site repairs, which will easily lead to expensive equipment maintenance costs and uncontrollable personnel maintenance. cycle