A test method for optimization and adjustment of boiler load control in generating units

Abstract

The invention relates to an optimization and adjustment testing method for load control of a generator set boiler. The method comprises the steps that (1), a boiler requirement command is processed through a leading / lagging function module; (2), a high selector module selects outputting; (3), a deviation calculation module calculates deviation; (4), the deviation calculation module outputs a deviation value to a main PID control module; (5), function f(x) linear processing and transforming are carried out on an actual load command of a set; (6), derivative control module operation and high and low amplitude limiting processing are carried out on the actual load command of the set; (7), superposition and summation are carried out; (8), the deviation value is input into a feedforward input channel of the main PID control module, and feedforward operation is carried out on the deviation value; (9), the deviation calculation module works out deviation; (10), an integral operation module carries out calculation; (11), the integral operation result is output as a master control command of the boiler. According to the method, the non-linear characteristic of the boiler in the load varying process of the generator set is effectively compensated for, the large-time-delay and great-inertia characteristic of the boiler is restrained, the control characteristic of the boiler is improved, the fluctuation range of the main steam pressure of the boiler is reduced, and the ability, to respond to the load change of a turbonator, of the boiler is improved.

Description

technical field [0001] The invention belongs to the technical field of automatic power generation control, in particular to a test method for optimizing and adjusting boiler load control of a generator set. Background technique [0002] The main feature of the power system is that power generation and power consumption are completed synchronously. Therefore, in order to continuously provide users with qualified electric energy, it is necessary to ensure that the output of the generator set is kept in balance with the external power load at any time. The boiler is the main equipment of the generating set. Its inherent nonlinearity, large delay, and large inertia characteristics determine whether the boiler load control strategy is advanced and perfect, which is the main factor affecting the ability of the turbogenerator to respond quickly to external load changes. [0003] The current boiler load control methods for generating units are as follows: figure 1 As shown, the boi...

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Problems solved by technology

This control scheme takes both energy control and fuel control characteristics of the boiler into consideration, but because it adopts a cascade feedback control strategy, it does not add an appropriate amount of feedforward control components, and cannot compensate the nonlinear characteristics of the boiler and suppress its large delay and large inertia. characteristics, which affect the speed at which the boiler responds to the load change of the turbo-generator set, so it cannot meet the requirements of the turbo-generator set to quickly respond to external load changes, and the control effect on the boiler load is not very ideal

In addition, the inner circuit uses the actual total fuel of the boiler as the feedback signal, and performs proportional-integral calculations on it, which is not conducive to the instantaneous balance of the instructions of the various coal feeders of the boiler. Coal feeder output

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