Control method for improving primary frequency modulation performance based on fuzzy control rule

Abstract

The invention discloses a control method for improving the primary frequency modulation performance based on a fuzzy control rule. The control method includes the steps of building a signal channel between a primary frequency modulation command and the gas turbine fuel valve opening degree; fuzzifying the actual power of a load point where a combined cycle unit is located, defining a fuzzy set of the actual power to be three fuzzy subsets, fuzzifying the primary frequency modulation command and the variable quantity of the gas turbine fuel valve opening degree, defining a fuzzy set of the primary frequency modulation command to be seven fuzzy subsets, and defining a fuzzy set of the variable quantity of the gas turbine fuel valve opening degree to be seven fuzzy subsets; obtaining a fuzzy control rule table, and solving a comprehensive fuzzy relation R; finally, deblurring fuzzy output quantity with a gravity method, obtaining the finally-accurate variable quantity of the gas turbine fuel valve opening degree, and overlaying the variable quantity of the gas turbine fuel valve opening degree into a signal of the gas turbine fuel valve opening degree. By means of the control method, the primary frequency modulation command of the combined cycle unit is directly overlaid on the gas turbine fuel valve opening degree through fuzzy rule operation, a unit load control system can more rapidly respond to the primary frequency modulation command, and the tracking effect is better.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for improving primary frequency modulation performance based on fuzzy control rules. Background technique [0002] With the further implementation of the national "energy saving and emission reduction" policy, the cost of generating electricity for thermal power generating units is increasing day by day, while gas turbines and their combined cycle units have a series of features such as high efficiency, high flexibility, low emissions, short construction period, and low capital expenditure. Advantages, become the first choice to replace thermal power units. Most of the combined cycle units undertake the task of power grid peak regulation, and their load command fluctuates greatly. The one-time frequency modulation command is relatively frequent. At the same time, the newly formulated assessment standard requires that the response time of one-time frequency modulation is less ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a control method based on fuzzy control rules to improve the performance of primary frequency regulation, and solve the problem that the gas turbine unit load response to primary frequency regulation instructions takes a long time and track once. FM command accuracy is poor, easy to oscillate technical problems

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